feat: expose audio codec in download result and skip lossy-to-lossless conversion

Go backend:
- Add AudioCodec field to DownloadResult and DownloadResponse
- Extension download results can now include audio_codec/audioCodec
- ffmpegGetInfo and probeAudioQuality now return codec field
- Add trackItemBytes option to file.download() for custom progress handling

Flutter:
- Check audio_codec before container conversion
- Skip FLAC conversion if source codec is lossy (AAC, MP3, Opus, etc.)
- Prevents fake upscale from lossy to lossless containers

.gitignore

@@ -44,6 +44,7 @@ go_backend/*.xcframework/
 # Android
 android/.gradle/
 android/app/libs/gobackend.aar
+android/app/libs/gobackend-sources.jar
 android/local.properties
 android/*.iml
 android/key.properties
@@ -57,7 +58,6 @@ ios/Pods/
 ios/.symlinks/
 ios/Flutter/Flutter.framework/
 ios/Flutter/Flutter.podspec
-android/app/libs/gobackend-sources.jar
 
 # Extension folder
 extension/
@@ -67,7 +67,10 @@ AGENTS.md
 
 # Temp/misc
 nul
+NUL
 network_requests.txt
+*.bak
+/AndroidManifest.xml
 
 # Log files
 *.log

CONTRIBUTING.md

@@ -86,7 +86,7 @@ Translation files are located in `lib/l10n/arb/`.
    git remote add upstream https://github.com/zarzet/SpotiFLAC-Mobile.git
    ```
 
-3. **Use FVM (Flutter Version: 3.38.1)**
+3. **Use FVM (Flutter Version: 3.41.5)**
    ```bash
    fvm use
    ```

README.md

@@ -1,9 +1,9 @@
 <div align="center">
 
 <picture>
-  <source media="(prefers-color-scheme: dark)" srcset="assets/images/banner-readme-dark.png">
-  <source media="(prefers-color-scheme: light)" srcset="assets/images/banner-readme-light.png">
-  <img alt="SpotiFLAC Mobile" src="assets/images/banner-readme-light.png" width="650" height="auto">
+  <source media="(prefers-color-scheme: dark)" srcset="assets/readme/banner-readme-dark.png">
+  <source media="(prefers-color-scheme: light)" srcset="assets/readme/banner-readme-light.png">
+  <img alt="SpotiFLAC Mobile" src="assets/readme/banner-readme-light.png" width="650" height="auto">
 </picture>
 
 <p align="center">
@@ -28,10 +28,10 @@
 ## Screenshots
 
 <p align="center">
-  <img src="assets/images/1.jpg?v=2" width="200" />
-  <img src="assets/images/2.jpg?v=2" width="200" />
-  <img src="assets/images/3.jpg?v=2" width="200" />
-  <img src="assets/images/4.jpg?v=2" width="200" />
+  <img src="assets/readme/1.jpg?v=2" width="200" />
+  <img src="assets/readme/2.jpg?v=2" width="200" />
+  <img src="assets/readme/3.jpg?v=2" width="200" />
+  <img src="assets/readme/4.jpg?v=2" width="200" />
 </p>
 
 ---

android/app/build.gradle.bak

@@ -1,71 +0,0 @@
-plugins {
-    id "com.android.application"
-    id "kotlin-android"
-    id "dev.flutter.flutter-gradle-plugin"
-}
-
-def localProperties = new Properties()
-def localPropertiesFile = rootProject.file('local.properties')
-if (localPropertiesFile.exists()) {
-    localPropertiesFile.withReader('UTF-8') { reader ->
-        localProperties.load(reader)
-    }
-}
-
-def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
-if (flutterVersionCode == null) {
-    flutterVersionCode = '1'
-}
-
-def flutterVersionName = localProperties.getProperty('flutter.versionName')
-if (flutterVersionName == null) {
-    flutterVersionName = '1.0'
-}
-
-android {
-    namespace "com.zarz.spotiflac"
-    compileSdk flutter.compileSdkVersion
-    ndkVersion flutter.ndkVersion
-
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
-
-    kotlinOptions {
-        jvmTarget = '1.8'
-    }
-
-    sourceSets {
-        main.java.srcDirs += 'src/main/kotlin'
-    }
-
-    defaultConfig {
-        applicationId "com.zarz.spotiflac"
-        minSdkVersion flutter.minSdkVersion
-        targetSdk flutter.targetSdkVersion
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
-    }
-
-    buildTypes {
-        release {
-            signingConfig signingConfigs.debug
-            minifyEnabled false
-            shrinkResources false
-        }
-    }
-}
-
-flutter {
-    source '../..'
-}
-
-dependencies {
-    // Go backend library (gomobile generated)
-    implementation fileTree(dir: 'libs', include: ['*.aar'])
-    
-    // Kotlin coroutines for async Go backend calls
-    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3'
-    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3'
-}

android/app/src/main/kotlin/com/example/temp_project/MainActivity.kt

@@ -1,5 +0,0 @@
-package com.example.temp_project
-
-import io.flutter.embedding.android.FlutterActivity
-
-class MainActivity : FlutterActivity()

android/app/src/main/kotlin/com/zarz/spotiflac/MainActivity.kt

@@ -772,6 +772,7 @@ class MainActivity: FlutterFragmentActivity() {
         return when {
             name.endsWith(".m4a") -> ".m4a"
             name.endsWith(".mp4") -> ".mp4"
+            name.endsWith(".aac") -> ".aac"
             name.endsWith(".mp3") -> ".mp3"
             name.endsWith(".opus") -> ".opus"
             name.endsWith(".flac") -> ".flac"
@@ -783,6 +784,10 @@ class MainActivity: FlutterFragmentActivity() {
     private fun extFromMimeType(mime: String?): String {
         return when (mime) {
             "audio/mp4" -> ".m4a"
+            "audio/aac" -> ".aac"
+            "audio/eac3" -> ".m4a"
+            "audio/ac3" -> ".m4a"
+            "audio/ac4" -> ".m4a"
             "audio/mpeg" -> ".mp3"
             "audio/ogg" -> ".opus"
             "audio/flac" -> ".flac"
@@ -1063,7 +1068,7 @@ class MainActivity: FlutterFragmentActivity() {
     }
 
     private val cueSiblingAudioExtensions = listOf(
-        ".flac", ".wav", ".ape", ".mp3", ".ogg", ".wv", ".m4a"
+        ".flac", ".wav", ".ape", ".mp3", ".ogg", ".wv", ".m4a", ".mp4", ".aac"
     )
 
     private fun getSafChildFileLookup(
@@ -1135,7 +1140,7 @@ class MainActivity: FlutterFragmentActivity() {
             it.currentFile = "Scanning folders..."
         }
 
-        val supportedAudioExt = setOf(".flac", ".m4a", ".mp3", ".opus", ".ogg")
+        val supportedAudioExt = setOf(".flac", ".m4a", ".mp4", ".aac", ".mp3", ".opus", ".ogg")
         val audioFiles = mutableListOf<Pair<DocumentFile, String>>()
         val cueFiles = mutableListOf<Pair<DocumentFile, DocumentFile>>()
         val visitedDirUris = mutableSetOf<String>()
@@ -1435,7 +1440,7 @@ class MainActivity: FlutterFragmentActivity() {
             it.currentFile = "Scanning folders..."
         }
 
-        val supportedAudioExt = setOf(".flac", ".m4a", ".mp3", ".opus", ".ogg")
+        val supportedAudioExt = setOf(".flac", ".m4a", ".mp4", ".aac", ".mp3", ".opus", ".ogg")
         val audioFiles = mutableListOf<Triple<DocumentFile, String, Long>>()
         val cueFilesToScan = mutableListOf<Triple<DocumentFile, DocumentFile, Long>>()
         val unchangedCueFiles = mutableListOf<Pair<DocumentFile, DocumentFile>>()
@@ -3475,7 +3480,7 @@ class MainActivity: FlutterFragmentActivity() {
                                                 } catch (_: Exception) { "" }
                                                 val cueBaseName = cueName.substringBeforeLast('.')
                                                 if (cueBaseName.isNotBlank()) {
-                                                    val commonExts = listOf(".flac", ".wav", ".ape", ".mp3", ".ogg", ".wv", ".m4a")
+                                                    val commonExts = listOf(".flac", ".wav", ".ape", ".mp3", ".ogg", ".wv", ".m4a", ".mp4", ".aac")
                                                     for (ext in commonExts) {
                                                         audioDoc = try { parentDir.findFile(cueBaseName + ext) } catch (_: Exception) { null }
                                                         if (audioDoc != null) break

android/app/src/main/kotlin/com/zarz/spotiflac/NativeDownloadFinalizer.kt

@@ -16,6 +16,7 @@ import com.antonkarpenko.ffmpegkit.ReturnCode
 import gobackend.Gobackend
 import org.json.JSONObject
 import java.io.File
+import java.io.RandomAccessFile
 import java.nio.ByteBuffer
 import java.util.Locale
 import java.util.concurrent.CancellationException
@@ -29,7 +30,7 @@ object NativeDownloadFinalizer {
     const val NATIVE_WORKER_CONTRACT_VERSION = 1
     // Native finalizer owns background-safe history writes while Flutter may be suspended.
     // Keep this schema contract in sync with Dart HistoryDatabase before bumping either side.
-    private const val HISTORY_SCHEMA_VERSION = 8
+    private const val HISTORY_SCHEMA_VERSION = 9
     private val activeFFmpegSessionIds = mutableSetOf<Long>()
     private val nativeFFmpegSessionIds = mutableSetOf<Long>()
     private val activeFFmpegSessionLock = Any()
@@ -72,6 +73,8 @@ object NativeDownloadFinalizer {
         "quality",
         "bit_depth",
         "sample_rate",
+        "bitrate",
+        "format",
         "genre",
         "composer",
         "label",
@@ -95,6 +98,7 @@ object NativeDownloadFinalizer {
         ".ogg",
         ".wav",
         ".aac",
+        ".mp4",
     )
 
     private data class FinalizeInput(
@@ -112,6 +116,7 @@ object NativeDownloadFinalizer {
         var bitDepth: Int?,
         var sampleRate: Int?,
         var bitrateKbps: Int? = null,
+        var audioCodec: String? = null,
         var pendingExternalLrc: String? = null,
         var pendingExternalLrcFileName: String? = null,
     )
@@ -174,6 +179,9 @@ object NativeDownloadFinalizer {
             sampleRate = optPositiveInt(result, "actual_sample_rate"),
             bitrateKbps = optPositiveBitrateKbps(result, "bitrate")
                 ?: optPositiveBitrateKbps(result, "actual_bitrate"),
+            audioCodec = normalizeAudioCodec(
+                result.optString("audio_codec", "").ifBlank { result.optString("format", "") },
+            ),
         )
 
         try {
@@ -214,6 +222,7 @@ object NativeDownloadFinalizer {
 
             result.put("file_path", state.filePath)
             if (state.fileName.isNotBlank()) result.put("file_name", state.fileName)
+            if (state.quality.isNotBlank()) result.put("quality", state.quality)
             result.put("native_finalized", true)
             result.put("history_written", true)
             result.put("history_item", historyToJson(history))
@@ -419,7 +428,13 @@ object NativeDownloadFinalizer {
                 for ((candidateOutput, mapAudioOnly) in attempts) {
                     try {
                         val audioMap = if (mapAudioOnly) "-map 0:a " else ""
-                        val command = "-v error -decryption_key ${q(candidate)} -f $inputFormat -i ${q(localInput)} ${audioMap}-c copy ${q(candidateOutput)} -y"
+                        // Force the flac muxer when the target extension is
+                        // .flac. Without this override FFmpeg keeps the ISO-BMFF
+                        // stream layout, producing FLAC-in-MP4 under a .flac
+                        // filename which downstream native FLAC tag writers
+                        // cannot read.
+                        val muxerOverride = if (candidateOutput.lowercase(Locale.ROOT).endsWith(".flac")) "-f flac " else ""
+                        val command = "-v error -decryption_key ${q(candidate)} -f $inputFormat -i ${q(localInput)} ${audioMap}-c copy ${muxerOverride}${q(candidateOutput)} -y"
                         val result = runFFmpeg(command, shouldCancel)
                         lastOutput = result.second
                         if (result.first && File(candidateOutput).exists()) {
@@ -461,13 +476,23 @@ object NativeDownloadFinalizer {
         if (!looksLikeM4a(state.filePath, state.fileName)) return
 
         val tidalHighFormat = input.request.optString("tidal_high_format", "").ifBlank { "mp3_320" }
-        val format = if (tidalHighFormat.startsWith("opus")) "opus" else "mp3"
+        val format = when {
+            tidalHighFormat.startsWith("opus") -> "opus"
+            tidalHighFormat.startsWith("aac") || tidalHighFormat.startsWith("m4a") -> "aac"
+            else -> "mp3"
+        }
+        val metadataFormat = if (format == "aac") "m4a" else format
+        val displayFormat = if (format == "aac") "AAC" else format.uppercase(Locale.ROOT)
         val bitrate = if (tidalHighFormat.contains("_")) {
             "${tidalHighFormat.substringAfterLast("_")}k"
         } else {
             if (format == "opus") "128k" else "320k"
         }
-        val ext = if (format == "opus") ".opus" else ".mp3"
+        val ext = when (format) {
+            "opus" -> ".opus"
+            "aac" -> ".m4a"
+            else -> ".mp3"
+        }
         val localInput = materializeForFFmpeg(context, input, state)
         val deleteLocalInput = state.filePath.startsWith("content://")
         val output = buildOutputPath(localInput, ext)
@@ -475,6 +500,8 @@ object NativeDownloadFinalizer {
         try {
             val command = if (format == "opus") {
                 "-v error -hide_banner -i ${q(localInput)} -codec:a libopus -b:a $bitrate -vbr on -compression_level 10 -map 0:a ${q(output)} -y"
+            } else if (format == "aac") {
+                "-v error -hide_banner -i ${q(localInput)} -codec:a aac -b:a $bitrate -map 0:a -f mp4 ${q(output)} -y"
             } else {
                 "-v error -hide_banner -i ${q(localInput)} -codec:a libmp3lame -b:a $bitrate -map 0:a -id3v2_version 3 ${q(output)} -y"
             }
@@ -482,14 +509,14 @@ object NativeDownloadFinalizer {
             if (!result.first || !File(output).exists()) {
                 throw IllegalStateException("HIGH conversion failed: ${result.second}")
             }
-            embedBasicMetadata(context, output, input, format)
+            embedBasicMetadata(context, output, input, metadataFormat)
             replaceStatePath(context, input, state, output, deleteOld = true)
             adoptedOutput = true
         } finally {
             if (!adoptedOutput) File(output).delete()
             if (deleteLocalInput) File(localInput).delete()
         }
-        state.quality = "${format.uppercase(Locale.ROOT)} ${bitrate.removeSuffix("k")}kbps"
+        state.quality = "$displayFormat ${bitrate.removeSuffix("k")}kbps"
         state.bitDepth = null
         state.sampleRate = null
     }
@@ -501,13 +528,37 @@ object NativeDownloadFinalizer {
         shouldCancel: () -> Boolean,
     ) {
         if (requestQuality(input) == "HIGH" || outputExt(input) != ".flac") return
-        if (!looksLikeM4a(state.filePath, state.fileName) && !shouldForceContainerConversion(input, state)) return
+        val requestedDecryptionExt = requestedDecryptionOutputExt(input)
+        val forceContainerConversion = shouldForceContainerConversion(input, state)
+        if (!forceContainerConversion && requestedDecryptionExt.isNotBlank() && requestedDecryptionExt != ".flac") return
+        val mayNeedContainerConversion = forceContainerConversion ||
+            looksLikeM4a(state.filePath, state.fileName) ||
+            state.filePath.startsWith("content://")
+        if (!mayNeedContainerConversion) return
 
         val localInput = materializeForFFmpeg(context, input, state)
         val deleteLocalInput = state.filePath.startsWith("content://")
         val output = buildOutputPath(localInput, ".flac")
         var adoptedOutput = false
         try {
+            val codec = probePrimaryAudioCodec(localInput, shouldCancel)
+            val isAlreadyNativeFlac = codec == "flac" && isNativeFlacFile(localInput)
+            if (!isLosslessAudioCodec(codec)) {
+                Log.d(TAG, "Preserving native container; audio codec is ${codec.ifBlank { "unknown" }}")
+                return
+            }
+            if (isAlreadyNativeFlac) {
+                Log.d(TAG, "Native FLAC payload detected; publishing as FLAC and embedding metadata")
+                val nativeFlacOutput = if (localInput.lowercase(Locale.ROOT).endsWith(".flac")) {
+                    localInput
+                } else {
+                    File(localInput).copyTo(File(output), overwrite = true).absolutePath
+                }
+                embedBasicMetadata(context, nativeFlacOutput, input, "flac")
+                replaceStatePath(context, input, state, nativeFlacOutput, deleteOld = true)
+                adoptedOutput = true
+                return
+            }
             val result = runFFmpeg(
                 "-v error -xerror -i ${q(localInput)} -c:a flac -compression_level 8 ${q(output)} -y",
                 shouldCancel,
@@ -633,6 +684,17 @@ object NativeDownloadFinalizer {
 
             val bitDepth = optPositiveInt(metadata, "bit_depth")
             val sampleRate = optPositiveInt(metadata, "sample_rate")
+            val probedCodec = normalizeAudioCodec(
+                metadata.optString("audio_codec", "").ifBlank {
+                    metadata.optString("codec", "").ifBlank {
+                        metadata.optString("format", "")
+                    }
+                }
+            )
+            if (probedCodec != null) {
+                state.audioCodec = probedCodec
+                result.put("audio_codec", probedCodec)
+            }
             if (bitDepth != null) {
                 state.bitDepth = bitDepth
                 result.put("actual_bit_depth", bitDepth)
@@ -643,7 +705,7 @@ object NativeDownloadFinalizer {
             }
             val bitrateKbps = optPositiveBitrateKbps(metadata, "bitrate")
                 ?: optPositiveBitrateKbps(metadata, "bit_rate")
-            if (bitrateKbps != null) {
+            if (bitrateKbps != null && isLossyAudioCodec(state.audioCodec)) {
                 state.bitrateKbps = bitrateKbps
                 result.put("bitrate", bitrateKbps)
             }
@@ -654,6 +716,7 @@ object NativeDownloadFinalizer {
                 bitDepth = state.bitDepth,
                 sampleRate = state.sampleRate,
                 bitrateKbps = state.bitrateKbps,
+                audioCodec = state.audioCodec,
                 storedQuality = state.quality,
             )
             if (displayQuality != null) {
@@ -691,15 +754,19 @@ object NativeDownloadFinalizer {
         bitDepth: Int?,
         sampleRate: Int?,
         bitrateKbps: Int?,
+        audioCodec: String? = null,
         storedQuality: String?,
     ): String? {
-        val format = audioFormatForPath(filePath, fileName)
+        val format = audioFormatForCodec(audioCodec) ?: audioFormatForPath(filePath, fileName)
         if (format == "OPUS" ||
             format == "MP3" ||
             format == "AAC" ||
+            format == "EAC3" ||
+            format == "AC3" ||
+            format == "AC4" ||
             (format == "M4A" && (bitDepth == null || bitDepth <= 0))
         ) {
-            return if (bitrateKbps != null && bitrateKbps > 0) {
+            return if (bitrateKbps != null && bitrateKbps >= 16) {
                 "$format ${bitrateKbps}kbps"
             } else {
                 nonPlaceholderQuality(storedQuality) ?: format
@@ -715,6 +782,43 @@ object NativeDownloadFinalizer {
         return nonPlaceholderQuality(storedQuality) ?: normalizeOptional(storedQuality)
     }
 
+    private fun audioFormatForCodec(codec: String?): String? {
+        return when (normalizeAudioCodec(codec)) {
+            "flac" -> "FLAC"
+            "alac" -> "ALAC"
+            "aac" -> "AAC"
+            "eac3" -> "EAC3"
+            "ac3" -> "AC3"
+            "ac4" -> "AC4"
+            "mp3" -> "MP3"
+            "opus" -> "OPUS"
+            else -> null
+        }
+    }
+
+    private fun isLossyAudioCodec(codec: String?): Boolean {
+        return when (normalizeAudioCodec(codec)) {
+            "aac", "eac3", "ac3", "ac4", "mp3", "opus", "m4a" -> true
+            else -> false
+        }
+    }
+
+    private fun normalizeAudioCodec(codec: String?): String? {
+        val normalized = normalizeOptional(codec)
+            ?.lowercase(Locale.ROOT)
+            ?.replace('-', '_')
+            ?: return null
+        return when (normalized) {
+            "mp4a" -> "aac"
+            "ec_3" -> "eac3"
+            "ac_3" -> "ac3"
+            "ac_4" -> "ac4"
+            "mp4" -> "m4a"
+            "ogg" -> "opus"
+            else -> normalized
+        }
+    }
+
     private fun audioFormatForPath(filePath: String, fileName: String): String? {
         for (candidate in listOf(filePath, fileName)) {
             val lower = candidate.trim().lowercase(Locale.ROOT)
@@ -730,6 +834,11 @@ object NativeDownloadFinalizer {
 
     private fun nonPlaceholderQuality(quality: String?): String? {
         val normalized = normalizeOptional(quality) ?: return null
+        val bitrateMatch = Regex("\\b(\\d+)\\s*kbps\\b", RegexOption.IGNORE_CASE).find(normalized)
+        if (bitrateMatch != null) {
+            val bitrate = bitrateMatch.groupValues.getOrNull(1)?.toIntOrNull()
+            if (bitrate != null && bitrate < 16) return null
+        }
         val key = normalized.lowercase(Locale.ROOT).replace(Regex("[^a-z0-9]+"), "_").trim('_')
         val placeholders = setOf(
             "best",
@@ -1146,7 +1255,7 @@ object NativeDownloadFinalizer {
         return when (normalizeExt(File(path).extension)) {
             ".mp3" -> "mp3"
             ".opus", ".ogg" -> "opus"
-            ".m4a", ".mp4" -> "m4a"
+            ".m4a", ".mp4", ".aac" -> "m4a"
             else -> "flac"
         }
     }
@@ -1294,7 +1403,7 @@ object NativeDownloadFinalizer {
         val rawName = input.request.optString("saf_file_name", "")
             .ifBlank { state.fileName }
             .ifBlank { "${trackString(input, "artistName", input.request.optString("artist_name", "Artist"))} - ${trackString(input, "name", input.request.optString("track_name", "Track"))}" }
-        val knownExts = listOf(".flac", ".m4a", ".mp4", ".mp3", ".opus", ".ogg", ".lrc")
+        val knownExts = listOf(".flac", ".m4a", ".mp4", ".aac", ".mp3", ".opus", ".ogg", ".lrc")
         var base = rawName.trim()
         val lower = base.lowercase(Locale.ROOT)
         for (knownExt in knownExts) {
@@ -1315,19 +1424,66 @@ object NativeDownloadFinalizer {
     private fun shouldForceContainerConversion(input: FinalizeInput, state: FinalizeState): Boolean {
         if (input.result.optBoolean("requires_container_conversion", false)) return true
         if (input.request.optBoolean("requires_container_conversion", false)) return true
+        return false
+    }
 
-        val actualExt = normalizeExt(
-            input.result.optString("actual_extension", "")
-                .ifBlank { input.result.optString("output_extension", "") }
+    private fun probePrimaryAudioCodec(path: String, shouldCancel: () -> Boolean = { false }): String {
+        val result = runFFmpeg("-hide_banner -nostdin -i ${q(path)} -map 0:a:0 -frames:a 1 -f null -", shouldCancel)
+        val output = result.second
+        val match = Regex("Audio:\\s*([^,\\s]+)", RegexOption.IGNORE_CASE).find(output)
+        return match?.groupValues?.getOrNull(1)
+            ?.trim()
+            ?.lowercase(Locale.ROOT)
+            ?.replace('-', '_')
+            .orEmpty()
+    }
+
+    /**
+     * Returns true when the file on [path] starts with the native FLAC magic
+     * bytes (`fLaC`). A file may contain a FLAC audio stream yet live inside
+     * an MP4/fMP4 container (e.g. some Amazon Music downloads); native FLAC
+     * tag writers require the raw fLaC header, so we must detect that mismatch
+     * before skipping the container conversion step.
+     */
+    private fun isNativeFlacFile(path: String): Boolean {
+        return try {
+            RandomAccessFile(path, "r").use { raf ->
+                if (raf.length() < 4L) return false
+                val header = ByteArray(4)
+                raf.readFully(header)
+                header[0] == 0x66.toByte() && // 'f'
+                    header[1] == 0x4C.toByte() && // 'L'
+                    header[2] == 0x61.toByte() && // 'a'
+                    header[3] == 0x43.toByte() // 'C'
+            }
+        } catch (e: Exception) {
+            Log.w(TAG, "Native FLAC magic probe failed for $path: ${e.message}")
+            false
+        }
+    }
+
+    private fun isLosslessAudioCodec(codec: String): Boolean {
+        val normalized = codec.trim().lowercase(Locale.ROOT).replace('-', '_')
+        if (normalized.isBlank()) return false
+        if (normalized.startsWith("pcm_")) return true
+        return normalized in setOf(
+            "alac",
+            "flac",
+            "wavpack",
+            "ape",
+            "tta",
+            "mlp",
+            "truehd",
+            "shorten"
         )
-        if (actualExt == ".m4a" || actualExt == ".mp4") return true
+    }
 
-        val container = input.result.optString("actual_container", "")
-            .ifBlank { input.result.optString("container", "") }
-            .trim()
-            .lowercase(Locale.ROOT)
-            .removePrefix(".")
-        return container == "m4a" || container == "mp4" || container == "mov" || container == "aac"
+    private fun requestedDecryptionOutputExt(input: FinalizeInput): String {
+        val descriptor = input.result.optJSONObject("decryption")
+        return normalizeExt(
+            descriptor?.optString("output_extension", "")
+                ?.ifBlank { input.result.optString("output_extension", "") }
+        )
     }
 
     private fun validateRequestContract(request: JSONObject) {
@@ -1541,6 +1697,10 @@ object NativeDownloadFinalizer {
         values.put("quality", state.quality)
         state.bitDepth?.let { values.put("bit_depth", it) }
         state.sampleRate?.let { values.put("sample_rate", it) }
+        state.bitrateKbps?.takeIf { it >= 16 && isLossyAudioCodec(state.audioCodec) }?.let {
+            values.put("bitrate", it)
+        }
+        normalizeAudioCodec(state.audioCodec)?.let { values.put("format", it) }
         values.put("genre", normalizeOptional(result.optString("genre", "").ifBlank { input.request.optString("genre", "") }))
         values.put("composer", normalizeOptional(resultString(input, "composer").ifBlank { trackString(input, "composer", requestString(input, "composer")) }))
         values.put("label", normalizeOptional(result.optString("label", "").ifBlank { input.request.optString("label", "") }))
@@ -1597,6 +1757,8 @@ object NativeDownloadFinalizer {
                       quality TEXT,
                       bit_depth INTEGER,
                       sample_rate INTEGER,
+                      bitrate INTEGER,
+                      format TEXT,
                       genre TEXT,
                       composer TEXT,
                       label TEXT,
@@ -1612,6 +1774,8 @@ object NativeDownloadFinalizer {
 	                ensureHistoryColumn(db, "composer", "ALTER TABLE history ADD COLUMN composer TEXT")
 	                ensureHistoryColumn(db, "total_tracks", "ALTER TABLE history ADD COLUMN total_tracks INTEGER")
 	                ensureHistoryColumn(db, "total_discs", "ALTER TABLE history ADD COLUMN total_discs INTEGER")
+	                ensureHistoryColumn(db, "bitrate", "ALTER TABLE history ADD COLUMN bitrate INTEGER")
+	                ensureHistoryColumn(db, "format", "ALTER TABLE history ADD COLUMN format TEXT")
 	                ensureHistoryColumn(db, "spotify_id_norm", "ALTER TABLE history ADD COLUMN spotify_id_norm TEXT")
 	                ensureHistoryColumn(db, "isrc_norm", "ALTER TABLE history ADD COLUMN isrc_norm TEXT")
 	                ensureHistoryColumn(db, "match_key", "ALTER TABLE history ADD COLUMN match_key TEXT")
@@ -1983,6 +2147,8 @@ object NativeDownloadFinalizer {
         putCamel("quality", "quality")
         putCamel("bit_depth", "bitDepth")
         putCamel("sample_rate", "sampleRate")
+        putCamel("bitrate", "bitrate")
+        putCamel("format", "format")
         putCamel("genre", "genre")
         putCamel("composer", "composer")
         putCamel("label", "label")
@@ -2014,11 +2180,12 @@ object NativeDownloadFinalizer {
 
     private fun optPositiveBitrateKbps(obj: JSONObject, key: String): Int? {
         val value = optPositiveInt(obj, key) ?: return null
-        return if (value >= 10000) {
+        val kbps = if (value >= 10000) {
             Math.round(value / 1000.0).toInt()
         } else {
             value
         }
+        return if (kbps >= 16) kbps else null
     }
 
     private fun positiveOrNull(primary: Int, fallback: Int): Int? {

android/app/src/main/kotlin/com/zarz/spotiflac/SafDownloadHandler.kt

@@ -15,6 +15,7 @@ import java.util.Locale
 object SafDownloadHandler {
     private val safDirLock = Any()
     private const val MAX_SAF_DISPLAY_NAME_UTF8_BYTES = 180
+    private const val STAGED_SAF_MIME_TYPE = "application/octet-stream"
 
     fun handle(context: Context, requestJson: String, downloader: (String) -> String): String {
         val req = JSONObject(requestJson)
@@ -31,15 +32,15 @@ object SafDownloadHandler {
         val fileName = buildSafFileName(req, outputExt)
         val deferSafPublish = req.optBoolean("defer_saf_publish", false)
         val useStagedOutput = req.optBoolean("stage_saf_output", false) && !deferSafPublish
-        val stagedFileName = if (useStagedOutput) buildStagedSafFileName(fileName, outputExt) else fileName
-        val staleStagedFileName = buildStagedSafFileName(fileName, outputExt)
+        val stagedFileName = if (useStagedOutput) buildStagedSafFileName(fileName) else fileName
+        val stagedMimeType = if (useStagedOutput) STAGED_SAF_MIME_TYPE else mimeType
 
         val existingDir = findDocumentDir(context, treeUri, relativeDir)
         if (existingDir != null) {
             val existing = existingDir.findFile(fileName)
             if (existing != null && existing.isFile && existing.length() > 0) {
                 if (useStagedOutput || deferSafPublish) {
-                    existingDir.findFile(staleStagedFileName)?.delete()
+                    deleteStaleStagedFiles(existingDir, fileName, outputExt)
                 }
                 val obj = JSONObject()
                 obj.put("success", true)
@@ -55,7 +56,7 @@ object SafDownloadHandler {
             ?: return errorJson("Failed to access SAF directory")
 
         if (deferSafPublish) {
-            targetDir.findFile(staleStagedFileName)?.delete()
+            deleteStaleStagedFiles(targetDir, fileName, outputExt)
             val workingExt = outputExt.ifBlank { ".tmp" }
             val workingFile = File.createTempFile("native_saf_work_", workingExt, context.cacheDir)
             Log.i("SpotiFLAC", "SAF deferred native output: target=$fileName working=${workingFile.name}")
@@ -89,7 +90,7 @@ object SafDownloadHandler {
             }
         }
 
-        var document = createOrReuseDocumentFile(targetDir, mimeType, stagedFileName)
+        var document = createOrReuseDocumentFile(targetDir, stagedMimeType, stagedFileName)
             ?: return errorJson("Failed to create SAF file")
 
         val pfd = context.contentResolver.openFileDescriptor(document.uri, "rw")
@@ -121,14 +122,14 @@ object SafDownloadHandler {
                         if (actualExt.isNotBlank() && actualExt != outputExt) {
                             val actualFileName = buildSafFileName(req, actualExt)
                             val actualStagedFileName = if (useStagedOutput) {
-                                buildStagedSafFileName(actualFileName, actualExt)
+                                buildStagedSafFileName(actualFileName)
                             } else {
                                 actualFileName
                             }
                             val actualMimeType = mimeTypeForExt(actualExt)
                             val replacement = createOrReuseDocumentFile(
                                 targetDir,
-                                actualMimeType,
+                                if (useStagedOutput) STAGED_SAF_MIME_TYPE else actualMimeType,
                                 actualStagedFileName
                             ) ?: throw IllegalStateException(
                                 "failed to create SAF output with actual extension"
@@ -212,8 +213,9 @@ object SafDownloadHandler {
             val targetDir = ensureDocumentDir(context, treeUri, relativeDir) ?: return null
             val finalName = sanitizeFilename(fileName)
             val ext = normalizeExt(finalName.substringAfterLast('.', ""))
-            val stagedName = buildStagedSafFileName(finalName, ext)
-            val document = createOrReuseDocumentFile(targetDir, mimeType, stagedName)
+            val stagedName = buildStagedSafFileName(finalName)
+            deleteStaleStagedFiles(targetDir, finalName, ext)
+            val document = createOrReuseDocumentFile(targetDir, STAGED_SAF_MIME_TYPE, stagedName)
                 ?: return null
             stagedDocument = document
             val outputStream = context.contentResolver.openOutputStream(document.uri, "wt")
@@ -288,13 +290,17 @@ object SafDownloadHandler {
         return safeName + normalizedExt
     }
 
-    private fun buildStagedSafFileName(fileName: String, outputExt: String): String {
+    private fun buildStagedSafFileName(fileName: String): String {
+        val safeName = sanitizeFilename(fileName)
+        return "$safeName.partial"
+    }
+
+    private fun buildLegacyStagedSafFileName(fileName: String, outputExt: String): String {
         val safeName = sanitizeFilename(fileName)
         val ext = normalizeExt(outputExt)
         if (ext.isNotBlank() && safeName.lowercase(Locale.ROOT).endsWith(ext)) {
             return safeName.dropLast(ext.length).trimEnd('.', ' ') + ".partial$ext"
         }
-
         val dot = safeName.lastIndexOf('.')
         if (dot > 0 && dot < safeName.lastIndex) {
             return safeName.substring(0, dot).trimEnd('.', ' ') +
@@ -304,6 +310,19 @@ object SafDownloadHandler {
         return "$safeName.partial"
     }
 
+    private fun deleteStaleStagedFiles(parent: DocumentFile, fileName: String, outputExt: String) {
+        val stagedNames = linkedSetOf(
+            buildStagedSafFileName(fileName),
+            buildLegacyStagedSafFileName(fileName, outputExt)
+        )
+        for (stagedName in stagedNames) {
+            try {
+                parent.findFile(stagedName)?.delete()
+            } catch (_: Exception) {
+            }
+        }
+    }
+
     private fun sanitizeFilename(name: String): String {
         var sanitized = name
             .replace("/", " ")

apps.json

@@ -7,9 +7,9 @@
       "name": "SpotiFLAC Mobile",
       "bundleIdentifier": "com.zarzet.spotiflac",
       "developerName": "zarzet",
-      "version": "4.5.0",
-      "versionDate": "2026-05-06",
-      "downloadURL": "https://github.com/zarzet/SpotiFLAC-Mobile/releases/download/v4.5.0/SpotiFLAC-v4.5.0-ios-unsigned.ipa",
+      "version": "4.5.5",
+      "versionDate": "2026-05-14",
+      "downloadURL": "https://github.com/zarzet/SpotiFLAC-Mobile/releases/download/v4.5.5/SpotiFLAC-v4.5.5-ios-unsigned.ipa",
       "localizedDescription": "SpotiFLAC Mobile is written in Flutter. Download tracks in true FLAC from Tidal, Qobuz, & Amazon Music.",
       "iconURL": "https://raw.githubusercontent.com/zarzet/SpotiFLAC-Mobile/main/assets/images/logo.png",
       "size": 37191956

go_backend/audio_metadata_supplement_test.go

@@ -308,16 +308,20 @@ func TestM4AMetadataAtomHelpers(t *testing.T) {
 		t.Fatalf("ReplayGain fields = %#v", fields)
 	}
 
-	qualityPath := filepath.Join(dir, "quality.m4a")
+	qualityPath := filepath.Join(dir, "quality-alac.m4a")
 	mvhd := make([]byte, 20)
 	binary.BigEndian.PutUint32(mvhd[12:16], 1000)
 	binary.BigEndian.PutUint32(mvhd[16:20], 180000)
 	sampleEntry := make([]byte, 32)
-	copy(sampleEntry[0:4], "mp4a")
+	copy(sampleEntry[0:4], "alac")
 	binary.BigEndian.PutUint16(sampleEntry[22:24], 24)
 	sampleEntry[28] = 0xAC
 	sampleEntry[29] = 0x44
-	qualityFile := append(buildM4AAtom("ftyp", []byte("M4A \x00\x00\x00\x00")), buildM4AAtom("moov", append(buildM4AAtom("mvhd", mvhd), sampleEntry...))...)
+	alacConfig := make([]byte, 24)
+	alacConfig[5] = 24
+	binary.BigEndian.PutUint32(alacConfig[20:24], 44100)
+	alacEntryPayload := append(append([]byte{}, sampleEntry[4:]...), buildM4AAtom("alac", alacConfig)...)
+	qualityFile := append(buildM4AAtom("ftyp", []byte("M4A \x00\x00\x00\x00")), buildM4AAtom("moov", append(buildM4AAtom("mvhd", mvhd), buildM4AAtom("alac", alacEntryPayload)...))...)
 	if err := os.WriteFile(qualityPath, qualityFile, 0600); err != nil {
 		t.Fatal(err)
 	}
@@ -327,6 +331,37 @@ func TestM4AMetadataAtomHelpers(t *testing.T) {
 	if quality, err := GetAudioQuality(qualityPath); err != nil || quality.SampleRate != 44100 {
 		t.Fatalf("GetAudioQuality M4A = %#v/%v", quality, err)
 	}
+	aacQualityPath := filepath.Join(dir, "quality-aac.m4a")
+	copy(sampleEntry[0:4], "mp4a")
+	aacQualityFile := append(buildM4AAtom("ftyp", []byte("M4A \x00\x00\x00\x00")), buildM4AAtom("moov", append(buildM4AAtom("mvhd", mvhd), sampleEntry...))...)
+	if err := os.WriteFile(aacQualityPath, aacQualityFile, 0600); err != nil {
+		t.Fatal(err)
+	}
+	if quality, err := GetM4AQuality(aacQualityPath); err != nil || quality.BitDepth != 0 || quality.SampleRate != 44100 || quality.Duration != 180 {
+		t.Fatalf("GetM4AQuality AAC = %#v/%v", quality, err)
+	}
+	eac3QualityPath := filepath.Join(dir, "quality-eac3.m4a")
+	zeroMvhd := make([]byte, 20)
+	eac3SampleEntry := make([]byte, 32)
+	copy(eac3SampleEntry[0:4], "ec-3")
+	eac3SampleEntry[28] = 0xBB
+	eac3SampleEntry[29] = 0x80
+	mdhd := make([]byte, 20)
+	binary.BigEndian.PutUint32(mdhd[12:16], 48000)
+	binary.BigEndian.PutUint32(mdhd[16:20], 48000*123)
+	eac3QualityFile := append(
+		buildM4AAtom("ftyp", []byte("M4A \x00\x00\x00\x00")),
+		buildM4AAtom("moov", append(
+			append(buildM4AAtom("mvhd", zeroMvhd), buildM4AAtom("trak", buildM4AAtom("mdia", buildM4AAtom("mdhd", mdhd)))...),
+			eac3SampleEntry...,
+		))...,
+	)
+	if err := os.WriteFile(eac3QualityPath, eac3QualityFile, 0600); err != nil {
+		t.Fatal(err)
+	}
+	if quality, err := GetM4AQuality(eac3QualityPath); err != nil || quality.Codec != "eac3" || quality.Duration != 123 {
+		t.Fatalf("GetM4AQuality EAC3 mdhd fallback = %#v/%v", quality, err)
+	}
 	if _, _, ok := parseALACSpecificConfig(make([]byte, 4)); ok {
 		t.Fatal("short ALAC config should not parse")
 	}

go_backend/exports.go

@@ -313,6 +313,7 @@ type DownloadResponse struct {
 	AlreadyExists               bool                    `json:"already_exists,omitempty"`
 	ActualBitDepth              int                     `json:"actual_bit_depth,omitempty"`
 	ActualSampleRate            int                     `json:"actual_sample_rate,omitempty"`
+	AudioCodec                  string                  `json:"audio_codec,omitempty"`
 	ActualExtension             string                  `json:"actual_extension,omitempty"`
 	ActualContainer             string                  `json:"actual_container,omitempty"`
 	RequiresContainerConversion bool                    `json:"requires_container_conversion,omitempty"`
@@ -342,6 +343,7 @@ type DownloadResult struct {
 	FilePath                    string
 	BitDepth                    int
 	SampleRate                  int
+	AudioCodec                  string
 	Title                       string
 	Artist                      string
 	Album                       string
@@ -863,6 +865,7 @@ func buildDownloadSuccessResponse(
 		AlreadyExists:               alreadyExists,
 		ActualBitDepth:              result.BitDepth,
 		ActualSampleRate:            result.SampleRate,
+		AudioCodec:                  result.AudioCodec,
 		ActualExtension:             result.ActualExtension,
 		ActualContainer:             result.ActualContainer,
 		RequiresContainerConversion: result.RequiresContainerConversion,
@@ -920,7 +923,12 @@ func enrichResultQualityFromFile(result *DownloadResult) {
 	if qErr == nil {
 		result.BitDepth = quality.BitDepth
 		result.SampleRate = quality.SampleRate
-		GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+		result.AudioCodec = quality.Codec
+		if quality.Codec != "" {
+			GoLog("[Download] Actual quality from file: %s %d-bit/%dHz\n", quality.Codec, quality.BitDepth, quality.SampleRate)
+		} else {
+			GoLog("[Download] Actual quality from file: %d-bit/%dHz\n", quality.BitDepth, quality.SampleRate)
+		}
 		return
 	}
 
@@ -1101,7 +1109,7 @@ func CleanupConnections() {
 func ReadFileMetadata(filePath string) (string, error) {
 	lower := strings.ToLower(filePath)
 	isFlac := strings.HasSuffix(lower, ".flac")
-	isM4A := strings.HasSuffix(lower, ".m4a") || strings.HasSuffix(lower, ".aac")
+	isM4A := strings.HasSuffix(lower, ".m4a") || strings.HasSuffix(lower, ".mp4") || strings.HasSuffix(lower, ".aac")
 	isMp3 := strings.HasSuffix(lower, ".mp3")
 	isOgg := strings.HasSuffix(lower, ".opus") || strings.HasSuffix(lower, ".ogg")
 	isApe := strings.HasSuffix(lower, ".ape")
@@ -1126,9 +1134,13 @@ func ReadFileMetadata(filePath string) (string, error) {
 		"composer":     "",
 		"comment":      "",
 		"duration":     0,
+		"format":       "",
+		"audio_codec":  "",
 	}
 
 	if isFlac {
+		result["format"] = "flac"
+		result["audio_codec"] = "flac"
 		metadata, err := ReadMetadata(filePath)
 		if err != nil {
 			// File may have wrong extension (e.g. opus saved as .flac).
@@ -1161,6 +1173,8 @@ func ReadFileMetadata(filePath string) (string, error) {
 						result["bitrate"] = quality.Bitrate / 1000
 					}
 				}
+				result["format"] = "opus"
+				result["audio_codec"] = "opus"
 			} else {
 				return "", fmt.Errorf("failed to read metadata: %w", err)
 			}
@@ -1190,12 +1204,16 @@ func ReadFileMetadata(filePath string) (string, error) {
 			if qualityErr == nil {
 				result["bit_depth"] = quality.BitDepth
 				result["sample_rate"] = quality.SampleRate
+				if quality.Codec != "" {
+					result["audio_codec"] = quality.Codec
+				}
 				if quality.SampleRate > 0 && quality.TotalSamples > 0 {
 					result["duration"] = int(quality.TotalSamples / int64(quality.SampleRate))
 				}
 			}
 		}
 	} else if isM4A {
+		result["format"] = "m4a"
 		meta, err := ReadM4ATags(filePath)
 		if err == nil && meta != nil {
 			result["title"] = meta.Title
@@ -1227,8 +1245,17 @@ func ReadFileMetadata(filePath string) (string, error) {
 			result["bit_depth"] = quality.BitDepth
 			result["sample_rate"] = quality.SampleRate
 			result["duration"] = quality.Duration
+			result["audio_codec"] = quality.Codec
+			if format := libraryFormatForM4ACodec(quality.Codec); format != "" {
+				result["format"] = format
+			}
+			if quality.Bitrate > 0 && !isLosslessLibraryFormat(fmt.Sprint(result["format"])) {
+				result["bitrate"] = quality.Bitrate
+			}
 		}
 	} else if isMp3 {
+		result["format"] = "mp3"
+		result["audio_codec"] = "mp3"
 		meta, err := ReadID3Tags(filePath)
 		if err == nil && meta != nil {
 			result["title"] = meta.Title
@@ -1265,6 +1292,8 @@ func ReadFileMetadata(filePath string) (string, error) {
 			}
 		}
 	} else if isOgg {
+		result["format"] = "opus"
+		result["audio_codec"] = "opus"
 		meta, err := ReadOggVorbisComments(filePath)
 		if err == nil && meta != nil {
 			result["title"] = meta.Title
@@ -1300,6 +1329,8 @@ func ReadFileMetadata(filePath string) (string, error) {
 			}
 		}
 	} else if isApe || isWv || isMpc {
+		result["format"] = strings.TrimPrefix(filepath.Ext(filePath), ".")
+		result["audio_codec"] = result["format"]
 		// APE, WavPack, Musepack: read APEv2 tags
 		apeTag, apeErr := ReadAPETags(filePath)
 		if apeErr == nil && apeTag != nil {
@@ -1400,6 +1431,19 @@ func EditFileMetadata(filePath, metadataJSON string) (string, error) {
 	isM4AFile := strings.HasSuffix(lower, ".m4a") || strings.HasSuffix(lower, ".mp4") || strings.HasSuffix(lower, ".m4b")
 	coverPath := strings.TrimSpace(fields["cover_path"])
 
+	if hasOnlyM4AReplayGainFields(fields) && (isM4AFile || isMP4ContainerFile(filePath)) {
+		if err := EditM4AReplayGain(filePath, fields); err != nil {
+			return "", fmt.Errorf("failed to write M4A metadata: %w", err)
+		}
+
+		resp := map[string]any{
+			"success": true,
+			"method":  "native_m4a_replaygain",
+		}
+		jsonBytes, _ := json.Marshal(resp)
+		return string(jsonBytes), nil
+	}
+
 	if isFlac {
 		if err := EditFlacFields(filePath, fields); err != nil {
 			return "", fmt.Errorf("failed to write FLAC metadata: %w", err)
@@ -1510,19 +1554,6 @@ func EditFileMetadata(filePath, metadataJSON string) (string, error) {
 		return string(jsonBytes), nil
 	}
 
-	if isM4AFile && hasOnlyM4AReplayGainFields(fields) {
-		if err := EditM4AReplayGain(filePath, fields); err != nil {
-			return "", fmt.Errorf("failed to write M4A metadata: %w", err)
-		}
-
-		resp := map[string]any{
-			"success": true,
-			"method":  "native_m4a_replaygain",
-		}
-		jsonBytes, _ := json.Marshal(resp)
-		return string(jsonBytes), nil
-	}
-
 	resp := map[string]any{
 		"success": true,
 		"method":  "ffmpeg",
@@ -1532,6 +1563,21 @@ func EditFileMetadata(filePath, metadataJSON string) (string, error) {
 	return string(jsonBytes), nil
 }
 
+func isMP4ContainerFile(filePath string) bool {
+	f, err := os.Open(filePath)
+	if err != nil {
+		return false
+	}
+	defer f.Close()
+
+	header := make([]byte, 12)
+	n, err := f.Read(header)
+	if err != nil || n < 8 {
+		return false
+	}
+	return string(header[4:8]) == "ftyp"
+}
+
 func hasOnlyM4AReplayGainFields(fields map[string]string) bool {
 	allowed := map[string]struct{}{
 		"replaygain_track_gain": {},

go_backend/exports_supplement_test.go

@@ -85,6 +85,14 @@ func TestExportsJSONWrappersAndExtensionManagerSurface(t *testing.T) {
 	if response, err := EditFileMetadata(filepath.Join(dir, "edit.mp3"), editJSON); err != nil || !strings.Contains(response, "ffmpeg") {
 		t.Fatalf("EditFileMetadata ffmpeg = %q/%v", response, err)
 	}
+	misnamedM4APath := filepath.Join(dir, "misnamed.flac")
+	if err := os.WriteFile(misnamedM4APath, buildM4AFileWithIlst(buildM4ATextTag("\xa9nam", "Misnamed"), true), 0600); err != nil {
+		t.Fatal(err)
+	}
+	replayGainJSON := `{"replaygain_track_gain":"-1 dB","replaygain_track_peak":"0.9"}`
+	if response, err := EditFileMetadata(misnamedM4APath, replayGainJSON); err != nil || !strings.Contains(response, "native_m4a_replaygain") {
+		t.Fatalf("EditFileMetadata misnamed m4a replaygain = %q/%v", response, err)
+	}
 	if _, err := EditFileMetadata(apePath, `not-json`); err == nil {
 		t.Fatal("expected invalid metadata JSON")
 	}

go_backend/extension_manager.go

@@ -367,8 +367,8 @@ func newIsolatedExtensionRuntime(ext *loadedExtension) (*goja.Runtime, *extensio
 		jar, _ := newSimpleCookieJar()
 		runtime.cookieJar = jar
 	}
-	runtime.httpClient = newExtensionHTTPClient(ext, runtime.cookieJar, extensionHTTPTimeout(ext, 30*time.Second))
-	runtime.downloadClient = newExtensionHTTPClient(ext, runtime.cookieJar, DownloadTimeout)
+	runtime.httpClient = newExtensionHTTPClient(ext, runtime.cookieJar, extensionHTTPTimeout(ext, 30*time.Second), true)
+	runtime.downloadClient = newExtensionHTTPClient(ext, runtime.cookieJar, DownloadTimeout, false)
 	runtime.RegisterAPIs(vm)
 	runtime.RegisterGoBackendAPIs(vm)
 

go_backend/extension_providers.go

@@ -236,6 +236,7 @@ func normalizeExtensionDownloadResult(result *ExtDownloadResult) (DownloadResult
 		FilePath:                    strings.TrimSpace(result.FilePath),
 		BitDepth:                    result.BitDepth,
 		SampleRate:                  result.SampleRate,
+		AudioCodec:                  strings.TrimSpace(result.AudioCodec),
 		Title:                       result.Title,
 		Artist:                      result.Artist,
 		Album:                       result.Album,
@@ -420,6 +421,7 @@ type ExtDownloadResult struct {
 	AlreadyExists bool   `json:"already_exists,omitempty"`
 	BitDepth      int    `json:"bit_depth,omitempty"`
 	SampleRate    int    `json:"sample_rate,omitempty"`
+	AudioCodec    string `json:"audio_codec,omitempty"`
 	ErrorMessage  string `json:"error_message,omitempty"`
 	ErrorType     string `json:"error_type,omitempty"`
 
@@ -873,6 +875,7 @@ func parseExtensionDownloadResultValue(vm *goja.Runtime, value goja.Value) ExtDo
 		AlreadyExists:   gojaObjectBool(obj, "already_exists", "alreadyExists"),
 		BitDepth:        gojaObjectInt(obj, "bit_depth", "bitDepth"),
 		SampleRate:      gojaObjectInt(obj, "sample_rate", "sampleRate"),
+		AudioCodec:      gojaObjectString(obj, "audio_codec", "audioCodec", "codec"),
 		ErrorMessage:    gojaObjectString(obj, "error_message", "errorMessage", "error"),
 		ErrorType:       gojaObjectString(obj, "error_type", "errorType"),
 		Title:           gojaObjectString(obj, "title"),

go_backend/extension_runtime.go

@@ -140,8 +140,8 @@ func newExtensionRuntime(ext *loadedExtension) *extensionRuntime {
 		storageFlushDelay: defaultStorageFlushDelay,
 	}
 
-	runtime.httpClient = newExtensionHTTPClient(ext, jar, extensionHTTPTimeout(ext, 30*time.Second))
-	runtime.downloadClient = newExtensionHTTPClient(ext, jar, DownloadTimeout)
+	runtime.httpClient = newExtensionHTTPClient(ext, jar, extensionHTTPTimeout(ext, 30*time.Second), true)
+	runtime.downloadClient = newExtensionHTTPClient(ext, jar, DownloadTimeout, false)
 
 	return runtime
 }
@@ -247,13 +247,18 @@ func (r *extensionRuntime) bindDownloadCancelContext(req *http.Request) *http.Re
 	return req.WithContext(initDownloadCancel(itemID))
 }
 
-func newExtensionHTTPClient(ext *loadedExtension, jar http.CookieJar, timeout time.Duration) *http.Client {
+func newExtensionHTTPClient(ext *loadedExtension, jar http.CookieJar, timeout time.Duration, compressResponses bool) *http.Client {
 	// Extension sandbox enforces HTTPS-only domains. Do not apply global
 	// allow_http scheme downgrade here, because some extension APIs (e.g.
 	// spotify-web) will redirect http -> https and can end up in 301 loops.
-	// We still reuse sharedTransport so insecure TLS compatibility mode remains effective.
+	// API calls can use response compression for faster metadata/search loads,
+	// while media downloads keep identity transfer semantics for progress/streaming.
+	transport := sharedTransport
+	if compressResponses {
+		transport = extensionAPITransport
+	}
 	client := &http.Client{
-		Transport: sharedTransport,
+		Transport: transport,
 		Timeout:   timeout,
 		Jar:       jar,
 	}

go_backend/extension_runtime_ffmpeg.go

@@ -131,6 +131,7 @@ func (r *extensionRuntime) ffmpegGetInfo(call goja.FunctionCall) goja.Value {
 		"sample_rate":   quality.SampleRate,
 		"total_samples": quality.TotalSamples,
 		"duration":      float64(quality.TotalSamples) / float64(quality.SampleRate),
+		"codec":         quality.Codec,
 	})
 }
 

go_backend/extension_runtime_file.go

@@ -136,6 +136,7 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 	var onProgress goja.Callable
 	var headers map[string]string
 	var chunkedDownload bool
+	trackItemBytes := true
 	var chunkSize int64
 	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) && !goja.IsNull(call.Arguments[2]) {
 		optionsObj := call.Arguments[2].Export()
@@ -151,6 +152,15 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 					onProgress = callable
 				}
 			}
+			if trackBytes, ok := opts["trackItemBytes"]; ok {
+				if v, ok := trackBytes.(bool); ok {
+					trackItemBytes = v
+				}
+			} else if trackBytes, ok := opts["track_item_bytes"]; ok {
+				if v, ok := trackBytes.(bool); ok {
+					trackItemBytes = v
+				}
+			}
 			if chunked, ok := opts["chunked"]; ok {
 				switch v := chunked.(type) {
 				case bool:
@@ -194,7 +204,7 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 	}
 
 	if chunkedDownload {
-		return r.fileDownloadChunked(client, urlStr, fullPath, headers, ua, chunkSize, onProgress)
+		return r.fileDownloadChunked(client, urlStr, fullPath, headers, ua, chunkSize, onProgress, trackItemBytes)
 	}
 
 	req, err := http.NewRequest("GET", urlStr, nil)
@@ -244,7 +254,7 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 	}
 
 	contentLength := resp.ContentLength
-	shouldTrackItemBytes := activeItemID != "" && onProgress == nil
+	shouldTrackItemBytes := activeItemID != "" && trackItemBytes
 	if shouldTrackItemBytes && contentLength > 0 {
 		SetItemBytesTotal(activeItemID, contentLength)
 	}
@@ -301,6 +311,14 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 		}
 	}
 
+	if shouldTrackItemBytes {
+		if contentLength > 0 {
+			SetItemProgress(activeItemID, float64(written)/float64(contentLength), written, contentLength)
+		} else if written > 0 {
+			SetItemBytesReceived(activeItemID, written)
+		}
+	}
+
 	GoLog("[Extension:%s] Downloaded %d bytes to %s\n", r.extensionID, written, fullPath)
 
 	return r.vm.ToValue(map[string]interface{}{
@@ -313,7 +331,7 @@ func (r *extensionRuntime) fileDownload(call goja.FunctionCall) goja.Value {
 // fileDownloadChunked downloads a URL using sequential Range requests.
 // This is needed for servers (like YouTube's googlevideo CDN) that reject
 // non-ranged or large-range requests with 403 and require small chunk downloads.
-func (r *extensionRuntime) fileDownloadChunked(client *http.Client, urlStr, fullPath string, headers map[string]string, ua string, chunkSize int64, onProgress goja.Callable) goja.Value {
+func (r *extensionRuntime) fileDownloadChunked(client *http.Client, urlStr, fullPath string, headers map[string]string, ua string, chunkSize int64, onProgress goja.Callable, trackItemBytes bool) goja.Value {
 	// First, get the total content length with a small probe request
 	probeReq, err := http.NewRequest("GET", urlStr, nil)
 	if err != nil {
@@ -383,7 +401,7 @@ func (r *extensionRuntime) fileDownloadChunked(client *http.Client, urlStr, full
 		SetItemDownloading(activeItemID)
 	}
 
-	shouldTrackItemBytes := activeItemID != "" && onProgress == nil
+	shouldTrackItemBytes := activeItemID != "" && trackItemBytes
 	if shouldTrackItemBytes && totalSize > 0 {
 		SetItemBytesTotal(activeItemID, totalSize)
 	}
@@ -526,6 +544,14 @@ func (r *extensionRuntime) fileDownloadChunked(client *http.Client, urlStr, full
 		}
 	}
 
+	if shouldTrackItemBytes {
+		if totalSize > 0 {
+			SetItemProgress(activeItemID, float64(totalWritten)/float64(totalSize), totalWritten, totalSize)
+		} else if totalWritten > 0 {
+			SetItemBytesReceived(activeItemID, totalWritten)
+		}
+	}
+
 	GoLog("[Extension:%s] Chunked download complete: %d bytes to %s\n", r.extensionID, totalWritten, fullPath)
 
 	return r.vm.ToValue(map[string]interface{}{

go_backend/extension_runtime_utils.go

@@ -415,6 +415,7 @@ func (r *extensionRuntime) RegisterGoBackendAPIs(vm *goja.Runtime) {
 			"sampleRate":   quality.SampleRate,
 			"totalSamples": quality.TotalSamples,
 			"duration":     quality.Duration,
+			"codec":        quality.Codec,
 		})
 	})
 

go_backend/httputil.go

@@ -79,6 +79,24 @@ var sharedTransport = &http.Transport{
 	DisableCompression:    true,
 }
 
+var extensionAPITransport = &http.Transport{
+	DialContext: (&net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
+	}).DialContext,
+	MaxIdleConns:          100,
+	MaxIdleConnsPerHost:   10,
+	MaxConnsPerHost:       20,
+	IdleConnTimeout:       90 * time.Second,
+	TLSHandshakeTimeout:   10 * time.Second,
+	ExpectContinueTimeout: 1 * time.Second,
+	DisableKeepAlives:     false,
+	ForceAttemptHTTP2:     true,
+	WriteBufferSize:       64 * 1024,
+	ReadBufferSize:        64 * 1024,
+	DisableCompression:    false,
+}
+
 var metadataTransport = &http.Transport{
 	DialContext: (&net.Dialer{
 		Timeout:   30 * time.Second,
@@ -131,6 +149,7 @@ func GetDownloadClient() *http.Client {
 
 func CloseIdleConnections() {
 	sharedTransport.CloseIdleConnections()
+	extensionAPITransport.CloseIdleConnections()
 	metadataTransport.CloseIdleConnections()
 }
 
@@ -143,6 +162,7 @@ func SetNetworkCompatibilityOptions(allowHTTP, insecureTLS bool) {
 	networkCompatibilityMu.Unlock()
 
 	applyTLSCompatibility(sharedTransport, insecureTLS)
+	applyTLSCompatibility(extensionAPITransport, insecureTLS)
 	applyTLSCompatibility(metadataTransport, insecureTLS)
 	CloseIdleConnections()
 

go_backend/library_scan.go

@@ -68,6 +68,8 @@ var (
 var supportedAudioFormats = map[string]bool{
 	".flac": true,
 	".m4a":  true,
+	".mp4":  true,
+	".aac":  true,
 	".mp3":  true,
 	".opus": true,
 	".ogg":  true,
@@ -87,6 +89,19 @@ type scannedCueFileInfo struct {
 	audioPath string
 }
 
+func isLibraryStagingFile(path string) bool {
+	name := strings.ToLower(filepath.Base(path))
+	if strings.HasSuffix(name, ".partial") {
+		return true
+	}
+	for ext := range supportedAudioFormats {
+		if strings.HasSuffix(name, ".partial"+ext) {
+			return true
+		}
+	}
+	return false
+}
+
 func collectLibraryAudioFiles(folderPath string, cancelCh <-chan struct{}) ([]libraryAudioFileInfo, error) {
 	var files []libraryAudioFileInfo
 
@@ -104,6 +119,9 @@ func collectLibraryAudioFiles(folderPath string, cancelCh <-chan struct{}) ([]li
 		if entry.IsDir() {
 			return nil
 		}
+		if isLibraryStagingFile(path) {
+			return nil
+		}
 
 		ext := strings.ToLower(filepath.Ext(path))
 		if !supportedAudioFormats[ext] {
@@ -314,7 +332,7 @@ func scanAudioFileWithKnownModTimeAndDisplayNameAndCoverCacheKey(filePath, displ
 	switch ext {
 	case ".flac":
 		return scanFLACFile(filePath, result, displayNameHint)
-	case ".m4a":
+	case ".m4a", ".mp4", ".aac":
 		return scanM4AFile(filePath, result, displayNameHint)
 	case ".mp3":
 		return scanMP3File(filePath, result, displayNameHint)
@@ -394,7 +412,6 @@ func scanM4AFile(filePath string, result *LibraryScanResult, displayNameHint str
 	metadata, err := ReadM4ATags(filePath)
 	if err != nil {
 		GoLog("[LibraryScan] M4A read error for %s: %v\n", filePath, err)
-		return scanFromFilename(filePath, displayNameHint, result)
 	}
 
 	if metadata != nil {
@@ -421,12 +438,54 @@ func scanM4AFile(filePath string, result *LibraryScanResult, displayNameHint str
 	if err == nil {
 		result.BitDepth = quality.BitDepth
 		result.SampleRate = quality.SampleRate
+		result.Duration = quality.Duration
+		if quality.Bitrate > 0 {
+			result.Bitrate = quality.Bitrate
+		}
+		if format := libraryFormatForM4ACodec(quality.Codec); format != "" {
+			result.Format = format
+			if isLosslessLibraryFormat(format) {
+				result.Bitrate = 0
+			}
+		}
+	}
+
+	if metadata == nil {
+		return scanFromFilename(filePath, displayNameHint, result)
 	}
 
 	applyDefaultLibraryMetadata(filePath, displayNameHint, result)
 	return result, nil
 }
 
+func libraryFormatForM4ACodec(codec string) string {
+	switch strings.ToLower(strings.TrimSpace(codec)) {
+	case "flac":
+		return "flac"
+	case "alac":
+		return "alac"
+	case "eac3", "ec-3":
+		return "eac3"
+	case "ac3", "ac-3":
+		return "ac3"
+	case "ac4", "ac-4":
+		return "ac4"
+	case "aac", "mp4a":
+		return "m4a"
+	default:
+		return ""
+	}
+}
+
+func isLosslessLibraryFormat(format string) bool {
+	switch strings.ToLower(strings.TrimSpace(format)) {
+	case "flac", "alac":
+		return true
+	default:
+		return false
+	}
+}
+
 func scanMP3File(filePath string, result *LibraryScanResult, displayNameHint string) (*LibraryScanResult, error) {
 	metadata, err := ReadID3Tags(filePath)
 	if err != nil {

go_backend/library_scan_supplement_test.go

@@ -42,6 +42,14 @@ func TestLibraryScanFullIncrementalAndMetadataFallbacks(t *testing.T) {
 	if err := os.WriteFile(filepath.Join(albumDir, "ignored.txt"), []byte("ignore"), 0600); err != nil {
 		t.Fatal(err)
 	}
+	legacyPartialPath := filepath.Join(albumDir, "Artist - Song.partial.flac")
+	if err := os.WriteFile(legacyPartialPath, []byte("partial flac"), 0600); err != nil {
+		t.Fatal(err)
+	}
+	newPartialPath := filepath.Join(albumDir, "Artist - Song.flac.partial")
+	if err := os.WriteFile(newPartialPath, []byte("partial flac"), 0600); err != nil {
+		t.Fatal(err)
+	}
 
 	files, err := collectLibraryAudioFiles(dir, make(chan struct{}))
 	if err != nil {
@@ -50,6 +58,11 @@ func TestLibraryScanFullIncrementalAndMetadataFallbacks(t *testing.T) {
 	if len(files) < 4 {
 		t.Fatalf("files = %#v", files)
 	}
+	for _, file := range files {
+		if file.path == legacyPartialPath || file.path == newPartialPath {
+			t.Fatalf("staging file should be ignored: %#v", files)
+		}
+	}
 	cancelCh := make(chan struct{})
 	close(cancelCh)
 	if _, err := collectLibraryAudioFiles(dir, cancelCh); err == nil {

go_backend/lyrics.go

@@ -26,6 +26,11 @@ const (
 	LyricsProviderMusixmatch = "musixmatch"
 	LyricsProviderAppleMusic = "apple_music"
 	LyricsProviderQQMusic    = "qqmusic"
+	LyricsProviderSpotify    = "spotify"
+	LyricsProviderDeezer     = "deezer"
+	LyricsProviderYouTube    = "youtube"
+	LyricsProviderKugou      = "kugou"
+	LyricsProviderGenius     = "genius"
 )
 
 var DefaultLyricsProviders = []string{
@@ -68,6 +73,7 @@ type LyricsFetchOptions struct {
 	IncludeTranslationNetease  bool   `json:"include_translation_netease"`
 	IncludeRomanizationNetease bool   `json:"include_romanization_netease"`
 	MultiPersonWordByWord      bool   `json:"multi_person_word_by_word"`
+	AppleElrcWordSync          bool   `json:"apple_elrc_word_sync"`
 	MusixmatchLanguage         string `json:"musixmatch_language,omitempty"`
 }
 
@@ -75,6 +81,7 @@ var defaultLyricsFetchOptions = LyricsFetchOptions{
 	IncludeTranslationNetease:  false,
 	IncludeRomanizationNetease: false,
 	MultiPersonWordByWord:      true,
+	AppleElrcWordSync:          false,
 	MusixmatchLanguage:         "",
 }
 
@@ -100,6 +107,11 @@ func SetLyricsProviderOrder(providers []string) {
 		LyricsProviderMusixmatch: true,
 		LyricsProviderAppleMusic: true,
 		LyricsProviderQQMusic:    true,
+		LyricsProviderSpotify:    true,
+		LyricsProviderDeezer:     true,
+		LyricsProviderYouTube:    true,
+		LyricsProviderKugou:      true,
+		LyricsProviderGenius:     true,
 	}
 
 	var valid []string
@@ -130,10 +142,15 @@ func GetLyricsProviderOrder() []string {
 func GetAvailableLyricsProviders() []map[string]interface{} {
 	return []map[string]interface{}{
 		{"id": LyricsProviderLRCLIB, "name": "LRCLIB", "has_proxy_dependency": false, "description": "Open-source synced lyrics database"},
-		{"id": LyricsProviderNetease, "name": "Netease", "has_proxy_dependency": true, "description": "NetEase Cloud Music lyrics via Paxsenix"},
-		{"id": LyricsProviderMusixmatch, "name": "Musixmatch", "has_proxy_dependency": true, "description": "Musixmatch lyrics via Paxsenix"},
-		{"id": LyricsProviderAppleMusic, "name": "Apple Music", "has_proxy_dependency": true, "description": "Apple Music synced lyrics via Paxsenix"},
-		{"id": LyricsProviderQQMusic, "name": "QQ Music", "has_proxy_dependency": true, "description": "QQ Music lyrics via Paxsenix"},
+		{"id": LyricsProviderNetease, "name": "Netease", "has_proxy_dependency": true, "description": "NetEase Cloud Music lyrics"},
+		{"id": LyricsProviderMusixmatch, "name": "Musixmatch", "has_proxy_dependency": true, "description": "Musixmatch lyrics"},
+		{"id": LyricsProviderAppleMusic, "name": "Apple Music", "has_proxy_dependency": true, "description": "Apple Music synced lyrics"},
+		{"id": LyricsProviderQQMusic, "name": "QQ Music", "has_proxy_dependency": true, "description": "QQ Music lyrics"},
+		{"id": LyricsProviderSpotify, "name": "Spotify", "has_proxy_dependency": true, "description": "Spotify synced lyrics"},
+		{"id": LyricsProviderDeezer, "name": "Deezer", "has_proxy_dependency": true, "description": "Deezer lyrics"},
+		{"id": LyricsProviderYouTube, "name": "YouTube", "has_proxy_dependency": true, "description": "YouTube lyrics"},
+		{"id": LyricsProviderKugou, "name": "Kugou", "has_proxy_dependency": true, "description": "Kugou lyrics"},
+		{"id": LyricsProviderGenius, "name": "Genius", "has_proxy_dependency": true, "description": "Genius lyrics"},
 	}
 }
 
@@ -151,12 +168,18 @@ func SetLyricsFetchOptions(opts LyricsFetchOptions) {
 
 	lyricsFetchOptionsMu.Lock()
 	defer lyricsFetchOptionsMu.Unlock()
+	changed := lyricsFetchOptions != normalized
 	lyricsFetchOptions = normalized
 
-	GoLog("[Lyrics] Fetch options set: translation=%v romanization=%v multi_person=%v musixmatch_lang=%q\n",
+	if changed {
+		globalLyricsCache.ClearAll()
+	}
+
+	GoLog("[Lyrics] Fetch options set: translation=%v romanization=%v multi_person=%v apple_elrc=%v musixmatch_lang=%q\n",
 		normalized.IncludeTranslationNetease,
 		normalized.IncludeRomanizationNetease,
 		normalized.MultiPersonWordByWord,
+		normalized.AppleElrcWordSync,
 		normalized.MusixmatchLanguage,
 	)
 }
@@ -530,9 +553,9 @@ func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName st
 
 		case LyricsProviderAppleMusic:
 			appleClient := NewAppleMusicClient()
-			lyrics, err = appleClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord)
+			lyrics, err = appleClient.FetchLyrics(trackName, primaryArtist, durationSec, fetchOptions.MultiPersonWordByWord, fetchOptions.AppleElrcWordSync)
 			if err != nil && primaryArtist != artistName {
-				lyrics, err = appleClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
+				lyrics, err = appleClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord, fetchOptions.AppleElrcWordSync)
 			}
 
 		case LyricsProviderQQMusic:
@@ -542,6 +565,53 @@ func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName st
 				lyrics, err = qqClient.FetchLyrics(trackName, artistName, durationSec, fetchOptions.MultiPersonWordByWord)
 			}
 
+		case LyricsProviderSpotify:
+			spotifyClient := NewSpotifyLyricsClient()
+			lyrics, err = spotifyClient.FetchLyrics(spotifyID, trackName, primaryArtist, durationSec)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = spotifyClient.FetchLyrics(spotifyID, trackName, artistName, durationSec)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = spotifyClient.FetchLyrics("", simplifiedTrack, primaryArtist, durationSec)
+			}
+
+		case LyricsProviderDeezer:
+			deezerClient := NewDeezerLyricsClient()
+			lyrics, err = deezerClient.FetchLyrics(spotifyID, trackName, primaryArtist, durationSec)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = deezerClient.FetchLyrics(spotifyID, trackName, artistName, durationSec)
+			}
+
+		case LyricsProviderYouTube:
+			youtubeClient := NewYouTubeLyricsClient()
+			lyrics, err = youtubeClient.FetchLyrics(trackName, primaryArtist, durationSec)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = youtubeClient.FetchLyrics(trackName, artistName, durationSec)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = youtubeClient.FetchLyrics(simplifiedTrack, primaryArtist, durationSec)
+			}
+
+		case LyricsProviderKugou:
+			kugouClient := NewKugouLyricsClient()
+			lyrics, err = kugouClient.FetchLyrics(trackName, primaryArtist, durationSec)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = kugouClient.FetchLyrics(trackName, artistName, durationSec)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = kugouClient.FetchLyrics(simplifiedTrack, primaryArtist, durationSec)
+			}
+
+		case LyricsProviderGenius:
+			geniusClient := NewGeniusLyricsClient()
+			lyrics, err = geniusClient.FetchLyrics(trackName, primaryArtist, durationSec)
+			if err != nil && primaryArtist != artistName {
+				lyrics, err = geniusClient.FetchLyrics(trackName, artistName, durationSec)
+			}
+			if err != nil && simplifiedTrack != trackName {
+				lyrics, err = geniusClient.FetchLyrics(simplifiedTrack, primaryArtist, durationSec)
+			}
+
 		default:
 			GoLog("[Lyrics] Unknown provider: %s, skipping\n", providerName)
 			continue

go_backend/lyrics_apple.go

@@ -173,25 +173,25 @@ func (c *AppleMusicClient) FetchLyricsByID(songID string) (string, error) {
 	return bodyStr, nil
 }
 
-func formatPaxLyricsToLRC(rawJSON string, multiPersonWordByWord bool) (string, error) {
+func formatPaxLyricsToLRC(rawJSON string, multiPersonWordByWord bool, preserveWordTiming bool) (string, error) {
 	var paxResp paxResponse
 	if err := json.Unmarshal([]byte(rawJSON), &paxResp); err == nil && paxResp.Content != nil {
-		return formatPaxContent(paxResp.Type, paxResp.Content, multiPersonWordByWord), nil
+		return formatPaxContent(paxResp.Type, paxResp.Content, multiPersonWordByWord, preserveWordTiming), nil
 	}
 
 	var directLyrics []paxLyrics
 	if err := json.Unmarshal([]byte(rawJSON), &directLyrics); err == nil && len(directLyrics) > 0 {
-		return formatPaxContent("Syllable", directLyrics, multiPersonWordByWord), nil
+		return formatPaxContent("Syllable", directLyrics, multiPersonWordByWord, preserveWordTiming), nil
 	}
 
 	return "", fmt.Errorf("failed to parse pax lyrics response")
 }
 
-func appendPaxLyricDetail(builder *strings.Builder, details []paxLyricDetail) {
+func appendPaxLyricDetail(builder *strings.Builder, details []paxLyricDetail, preserveWordTiming bool) {
 	lastStart := ""
 
 	for _, syllable := range details {
-		if syllable.Timestamp != nil {
+		if preserveWordTiming && syllable.Timestamp != nil {
 			start := fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.Timestamp)))
 			if start != lastStart {
 				builder.WriteString(start)
@@ -204,13 +204,13 @@ func appendPaxLyricDetail(builder *strings.Builder, details []paxLyricDetail) {
 			builder.WriteString(" ")
 		}
 
-		if syllable.EndTime != nil {
+		if preserveWordTiming && syllable.EndTime != nil {
 			builder.WriteString(fmt.Sprintf("<%s>", msToLRCTimestampInline(int64(*syllable.EndTime))))
 		}
 	}
 }
 
-func formatPaxContent(lyricsType string, content []paxLyrics, multiPersonWordByWord bool) string {
+func formatPaxContent(lyricsType string, content []paxLyrics, multiPersonWordByWord bool, preserveWordTiming bool) string {
 	var sb strings.Builder
 
 	for i, line := range content {
@@ -230,11 +230,11 @@ func formatPaxContent(lyricsType string, content []paxLyrics, multiPersonWordByW
 				}
 			}
 
-			appendPaxLyricDetail(&sb, line.Text)
+			appendPaxLyricDetail(&sb, line.Text, preserveWordTiming)
 
 			if line.Background && multiPersonWordByWord && len(line.BackgroundText) > 0 {
 				sb.WriteString("\n[bg:")
-				appendPaxLyricDetail(&sb, line.BackgroundText)
+				appendPaxLyricDetail(&sb, line.BackgroundText, preserveWordTiming)
 				sb.WriteString("]")
 			}
 		} else {
@@ -253,6 +253,7 @@ func (c *AppleMusicClient) FetchLyrics(
 	artistName string,
 	durationSec float64,
 	multiPersonWordByWord bool,
+	preserveWordTiming bool,
 ) (*LyricsResponse, error) {
 	songID, err := c.SearchSong(trackName, artistName, durationSec)
 	if err != nil {
@@ -267,7 +268,7 @@ func (c *AppleMusicClient) FetchLyrics(
 		return nil, fmt.Errorf("apple music proxy returned non-lyric payload: %s", errMsg)
 	}
 
-	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord)
+	lrcText, err := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord, preserveWordTiming)
 	if err != nil {
 		lrcText = rawLyrics
 	}

go_backend/lyrics_paxsenix.go

@@ -0,0 +1,565 @@
+package gobackend
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"math"
+	"net/http"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type SpotifyLyricsClient struct {
+	httpClient *http.Client
+}
+
+type DeezerLyricsClient struct {
+	httpClient *http.Client
+}
+
+type YouTubeLyricsClient struct {
+	httpClient *http.Client
+}
+
+type KugouLyricsClient struct {
+	httpClient *http.Client
+}
+
+type GeniusLyricsClient struct {
+	httpClient *http.Client
+}
+
+type spotifyLyricsSearchResult struct {
+	TrackID    string `json:"trackId"`
+	Name       string `json:"name"`
+	ArtistName string `json:"artistName"`
+	Duration   string `json:"duration"`
+}
+
+type youtubeLyricsSearchResult struct {
+	VideoID  string `json:"videoId"`
+	Title    string `json:"title"`
+	Author   string `json:"author"`
+	Duration string `json:"duration"`
+}
+
+type kugouLyricsSearchResult struct {
+	Hash     string  `json:"hash"`
+	Title    string  `json:"title"`
+	Artist   string  `json:"artist"`
+	Duration float64 `json:"duration"`
+}
+
+type geniusSearchResponse struct {
+	Response struct {
+		Sections []struct {
+			Hits []struct {
+				Type   string `json:"type"`
+				Result struct {
+					Title              string `json:"title"`
+					ArtistNames        string `json:"artist_names"`
+					PrimaryArtistNames string `json:"primary_artist_names"`
+					URL                string `json:"url"`
+				} `json:"result"`
+			} `json:"hits"`
+		} `json:"sections"`
+	} `json:"response"`
+}
+
+type paxsenixLyricsObject struct {
+	Type        string      `json:"type"`
+	Content     []paxLyrics `json:"content"`
+	Lyrics      []paxLyrics `json:"lyrics"`
+	LyricsText  string      `json:"lyrics_text"`
+	PlainLyrics string      `json:"plain_lyrics"`
+}
+
+func NewSpotifyLyricsClient() *SpotifyLyricsClient {
+	return &SpotifyLyricsClient{httpClient: NewMetadataHTTPClient(15 * time.Second)}
+}
+
+func NewDeezerLyricsClient() *DeezerLyricsClient {
+	return &DeezerLyricsClient{httpClient: NewMetadataHTTPClient(15 * time.Second)}
+}
+
+func NewYouTubeLyricsClient() *YouTubeLyricsClient {
+	return &YouTubeLyricsClient{httpClient: NewMetadataHTTPClient(15 * time.Second)}
+}
+
+func NewKugouLyricsClient() *KugouLyricsClient {
+	return &KugouLyricsClient{httpClient: NewMetadataHTTPClient(15 * time.Second)}
+}
+
+func NewGeniusLyricsClient() *GeniusLyricsClient {
+	return &GeniusLyricsClient{httpClient: NewMetadataHTTPClient(15 * time.Second)}
+}
+
+func fetchPaxsenixBody(httpClient *http.Client, endpoint string, params url.Values) (string, error) {
+	fullURL := endpoint
+	if len(params) > 0 {
+		fullURL += "?" + params.Encode()
+	}
+
+	req, err := http.NewRequest("GET", fullURL, nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("User-Agent", appUserAgent())
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read response: %w", err)
+	}
+
+	trimmed := strings.TrimSpace(string(body))
+	if resp.StatusCode != http.StatusOK {
+		if errMsg, isErrorPayload := detectLyricsErrorPayload(trimmed); isErrorPayload {
+			return "", fmt.Errorf("HTTP %d: %s", resp.StatusCode, errMsg)
+		}
+		return "", fmt.Errorf("HTTP %d", resp.StatusCode)
+	}
+	if errMsg, isErrorPayload := detectLyricsErrorPayload(trimmed); isErrorPayload {
+		return "", fmt.Errorf("%s", errMsg)
+	}
+	if trimmed == "" {
+		return "", fmt.Errorf("empty response")
+	}
+	return trimmed, nil
+}
+
+func parsePaxsenixLyricsPayload(raw, provider string, multiPersonWordByWord bool) (*LyricsResponse, error) {
+	var lrcPayload string
+	if err := json.Unmarshal([]byte(raw), &lrcPayload); err == nil {
+		lrcPayload = strings.TrimSpace(lrcPayload)
+		if lrcPayload == "" {
+			return nil, fmt.Errorf("%s returned empty lyrics", provider)
+		}
+		return lyricsResponseFromText(lrcPayload, provider), nil
+	}
+
+	var rawObject map[string]json.RawMessage
+	if err := json.Unmarshal([]byte(raw), &rawObject); err == nil {
+		for _, key := range []string{"lyrics", "lyric", "lyrics_text", "plain_lyrics"} {
+			var value string
+			if rawValue, ok := rawObject[key]; ok && json.Unmarshal(rawValue, &value) == nil {
+				value = strings.TrimSpace(value)
+				if value != "" {
+					return lyricsResponseFromText(value, provider), nil
+				}
+			}
+		}
+	}
+
+	var payload paxsenixLyricsObject
+	if err := json.Unmarshal([]byte(raw), &payload); err == nil {
+		switch {
+		case strings.TrimSpace(payload.LyricsText) != "":
+			return lyricsResponseFromText(payload.LyricsText, provider), nil
+		case len(payload.Lyrics) > 0:
+			return lyricsResponseFromText(formatPaxContent("Syllable", payload.Lyrics, multiPersonWordByWord, true), provider), nil
+		case len(payload.Content) > 0:
+			lyricsType := payload.Type
+			if lyricsType == "" {
+				lyricsType = "Syllable"
+			}
+			return lyricsResponseFromText(formatPaxContent(lyricsType, payload.Content, multiPersonWordByWord, true), provider), nil
+		case strings.TrimSpace(payload.PlainLyrics) != "":
+			return lyricsResponseFromText(payload.PlainLyrics, provider), nil
+		}
+	}
+
+	trimmed := strings.TrimSpace(raw)
+	if trimmed != "" && !strings.HasPrefix(trimmed, "{") && !strings.HasPrefix(trimmed, "[") {
+		return lyricsResponseFromText(trimmed, provider), nil
+	}
+	return nil, fmt.Errorf("failed to decode %s lyrics response", provider)
+}
+
+func lyricsResponseFromText(text, provider string) *LyricsResponse {
+	lines := parseSyncedLyrics(text)
+	if len(lines) > 0 {
+		return &LyricsResponse{
+			Lines:       lines,
+			SyncType:    "LINE_SYNCED",
+			PlainLyrics: plainLyricsFromTimedLines(lines),
+			Provider:    provider,
+			Source:      provider,
+		}
+	}
+
+	plainLines := plainTextLyricsLines(text)
+	if len(plainLines) > 0 {
+		return &LyricsResponse{
+			Lines:       plainLines,
+			SyncType:    "UNSYNCED",
+			PlainLyrics: text,
+			Provider:    provider,
+			Source:      provider,
+		}
+	}
+
+	return &LyricsResponse{Provider: provider, Source: provider}
+}
+
+func normalizeSpotifyLyricsID(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if raw == "" || strings.HasPrefix(strings.ToLower(raw), "deezer:") {
+		return ""
+	}
+	if strings.HasPrefix(strings.ToLower(raw), "spotify:") {
+		parts := strings.Split(raw, ":")
+		raw = parts[len(parts)-1]
+	}
+	if strings.Contains(raw, "spotify.com/track/") {
+		raw = extractSpotifyIDFromURL(raw)
+	}
+	raw = strings.TrimSpace(strings.Split(raw, "?")[0])
+	if regexpSpotifyTrackID.MatchString(raw) {
+		return raw
+	}
+	return ""
+}
+
+var regexpSpotifyTrackID = regexp.MustCompile(`^[A-Za-z0-9]{22}$`)
+
+func (c *SpotifyLyricsClient) SearchSong(trackName, artistName string, durationSec float64) (string, error) {
+	query := strings.TrimSpace(trackName + " " + artistName)
+	if query == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	params := url.Values{}
+	params.Set("q", query)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/spotify/search", params)
+	if err != nil {
+		return "", fmt.Errorf("spotify search failed: %w", err)
+	}
+
+	var results []spotifyLyricsSearchResult
+	if err := json.Unmarshal([]byte(raw), &results); err != nil {
+		return "", fmt.Errorf("failed to decode spotify search: %w", err)
+	}
+	best := selectBestSpotifyLyricsSearchResult(results, trackName, artistName, durationSec)
+	if best == nil || strings.TrimSpace(best.TrackID) == "" {
+		return "", fmt.Errorf("no songs found on spotify")
+	}
+	return strings.TrimSpace(best.TrackID), nil
+}
+
+func selectBestSpotifyLyricsSearchResult(results []spotifyLyricsSearchResult, trackName, artistName string, durationSec float64) *spotifyLyricsSearchResult {
+	if len(results) == 0 {
+		return nil
+	}
+
+	bestIndex := 0
+	bestScore := -1
+	for i := range results {
+		result := &results[i]
+		score := scoreLyricsSearchCandidate(result.Name, result.ArtistName, parseClockDuration(result.Duration), trackName, artistName, durationSec)
+		if score > bestScore {
+			bestIndex = i
+			bestScore = score
+		}
+	}
+	return &results[bestIndex]
+}
+
+func (c *SpotifyLyricsClient) FetchLyricsByID(trackID string) (*LyricsResponse, error) {
+	params := url.Values{}
+	params.Set("id", trackID)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/spotify/lyrics", params)
+	if err != nil {
+		return nil, fmt.Errorf("spotify lyrics fetch failed: %w", err)
+	}
+	return parsePaxsenixLyricsPayload(raw, "Spotify", false)
+}
+
+func (c *SpotifyLyricsClient) FetchLyrics(spotifyID, trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
+	trackID := normalizeSpotifyLyricsID(spotifyID)
+	if trackID == "" {
+		var err error
+		trackID, err = c.SearchSong(trackName, artistName, durationSec)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return c.FetchLyricsByID(trackID)
+}
+
+func normalizeDeezerLyricsID(raw string) string {
+	raw = strings.TrimSpace(raw)
+	if strings.HasPrefix(strings.ToLower(raw), "deezer:") {
+		raw = strings.TrimSpace(raw[len("deezer:"):])
+	}
+	if strings.Contains(raw, "deezer.com/") {
+		raw = extractDeezerIDFromURL(raw)
+	}
+	raw = strings.TrimSpace(strings.Split(raw, "?")[0])
+	if _, err := strconv.ParseInt(raw, 10, 64); err == nil {
+		return raw
+	}
+	return ""
+}
+
+func (c *DeezerLyricsClient) FetchLyricsByID(trackID string, multiPersonWordByWord bool) (*LyricsResponse, error) {
+	params := url.Values{}
+	params.Set("id", trackID)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/deezer/lyrics", params)
+	if err != nil {
+		return nil, fmt.Errorf("deezer lyrics fetch failed: %w", err)
+	}
+	return parsePaxsenixLyricsPayload(raw, "Deezer", multiPersonWordByWord)
+}
+
+func (c *DeezerLyricsClient) FetchLyrics(spotifyID, trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
+	deezerID := normalizeDeezerLyricsID(spotifyID)
+	if deezerID == "" {
+		spotifyTrackID := normalizeSpotifyLyricsID(spotifyID)
+		if spotifyTrackID == "" {
+			return nil, fmt.Errorf("deezer provider needs a deezer id or spotify id")
+		}
+		resolvedID, err := NewSongLinkClient().GetDeezerIDFromSpotify(spotifyTrackID)
+		if err != nil {
+			return nil, fmt.Errorf("failed to resolve deezer id: %w", err)
+		}
+		deezerID = normalizeDeezerLyricsID(resolvedID)
+	}
+	if deezerID == "" {
+		return nil, fmt.Errorf("deezer id unavailable")
+	}
+	return c.FetchLyricsByID(deezerID, true)
+}
+
+func (c *YouTubeLyricsClient) SearchSong(trackName, artistName string, durationSec float64) (string, error) {
+	query := strings.TrimSpace(trackName + " " + artistName)
+	if query == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	params := url.Values{}
+	params.Set("q", query)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/youtube/search", params)
+	if err != nil {
+		return "", fmt.Errorf("youtube search failed: %w", err)
+	}
+
+	var results []youtubeLyricsSearchResult
+	if err := json.Unmarshal([]byte(raw), &results); err != nil {
+		return "", fmt.Errorf("failed to decode youtube search: %w", err)
+	}
+	best := selectBestYouTubeLyricsSearchResult(results, trackName, artistName, durationSec)
+	if best == nil || strings.TrimSpace(best.VideoID) == "" {
+		return "", fmt.Errorf("no songs found on youtube")
+	}
+	return strings.TrimSpace(best.VideoID), nil
+}
+
+func selectBestYouTubeLyricsSearchResult(results []youtubeLyricsSearchResult, trackName, artistName string, durationSec float64) *youtubeLyricsSearchResult {
+	if len(results) == 0 {
+		return nil
+	}
+
+	bestIndex := 0
+	bestScore := -1
+	for i := range results {
+		result := &results[i]
+		score := scoreLyricsSearchCandidate(result.Title, result.Author, parseClockDuration(result.Duration), trackName, artistName, durationSec)
+		if score > bestScore {
+			bestIndex = i
+			bestScore = score
+		}
+	}
+	return &results[bestIndex]
+}
+
+func (c *YouTubeLyricsClient) FetchLyrics(trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
+	videoID, err := c.SearchSong(trackName, artistName, durationSec)
+	if err != nil {
+		return nil, err
+	}
+
+	params := url.Values{}
+	params.Set("id", videoID)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/youtube/lyrics", params)
+	if err != nil {
+		return nil, fmt.Errorf("youtube lyrics fetch failed: %w", err)
+	}
+	return parsePaxsenixLyricsPayload(raw, "YouTube", false)
+}
+
+func (c *KugouLyricsClient) SearchSong(trackName, artistName string, durationSec float64) (string, error) {
+	query := strings.TrimSpace(trackName + " " + artistName)
+	if query == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	params := url.Values{}
+	params.Set("q", query)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/kugou/search", params)
+	if err != nil {
+		return "", fmt.Errorf("kugou search failed: %w", err)
+	}
+
+	var results []kugouLyricsSearchResult
+	if err := json.Unmarshal([]byte(raw), &results); err != nil {
+		return "", fmt.Errorf("failed to decode kugou search: %w", err)
+	}
+	best := selectBestKugouLyricsSearchResult(results, trackName, artistName, durationSec)
+	if best == nil || strings.TrimSpace(best.Hash) == "" {
+		return "", fmt.Errorf("no songs found on kugou")
+	}
+	return strings.TrimSpace(best.Hash), nil
+}
+
+func selectBestKugouLyricsSearchResult(results []kugouLyricsSearchResult, trackName, artistName string, durationSec float64) *kugouLyricsSearchResult {
+	if len(results) == 0 {
+		return nil
+	}
+
+	bestIndex := 0
+	bestScore := -1
+	for i := range results {
+		result := &results[i]
+		score := scoreLyricsSearchCandidate(result.Title, result.Artist, result.Duration, trackName, artistName, durationSec)
+		if score > bestScore {
+			bestIndex = i
+			bestScore = score
+		}
+	}
+	return &results[bestIndex]
+}
+
+func (c *KugouLyricsClient) FetchLyrics(trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
+	hash, err := c.SearchSong(trackName, artistName, durationSec)
+	if err != nil {
+		return nil, err
+	}
+
+	params := url.Values{}
+	params.Set("id", hash)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/kugou/lyrics", params)
+	if err != nil {
+		return nil, fmt.Errorf("kugou lyrics fetch failed: %w", err)
+	}
+	return parsePaxsenixLyricsPayload(raw, "Kugou", false)
+}
+
+func (c *GeniusLyricsClient) SearchSong(trackName, artistName string, durationSec float64) (string, error) {
+	query := strings.TrimSpace(trackName + " " + artistName)
+	if query == "" {
+		return "", fmt.Errorf("empty search query")
+	}
+
+	params := url.Values{}
+	params.Set("q", query)
+	params.Set("per_page", "10")
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://genius.com/api/search/multi", params)
+	if err != nil {
+		return "", fmt.Errorf("genius search failed: %w", err)
+	}
+
+	var results geniusSearchResponse
+	if err := json.Unmarshal([]byte(raw), &results); err != nil {
+		return "", fmt.Errorf("failed to decode genius search: %w", err)
+	}
+
+	bestURL := ""
+	bestScore := -1
+	for _, section := range results.Response.Sections {
+		for _, hit := range section.Hits {
+			if hit.Type != "song" || strings.TrimSpace(hit.Result.URL) == "" {
+				continue
+			}
+
+			artist := hit.Result.PrimaryArtistNames
+			if strings.TrimSpace(artist) == "" {
+				artist = hit.Result.ArtistNames
+			}
+			score := scoreLyricsSearchCandidate(hit.Result.Title, artist, 0, trackName, artistName, durationSec)
+			if score > bestScore {
+				bestScore = score
+				bestURL = strings.TrimSpace(hit.Result.URL)
+			}
+		}
+	}
+
+	if bestURL == "" {
+		return "", fmt.Errorf("no songs found on genius")
+	}
+	return bestURL, nil
+}
+
+func (c *GeniusLyricsClient) FetchLyrics(trackName, artistName string, durationSec float64) (*LyricsResponse, error) {
+	geniusURL, err := c.SearchSong(trackName, artistName, durationSec)
+	if err != nil {
+		return nil, err
+	}
+
+	params := url.Values{}
+	params.Set("url", geniusURL)
+	raw, err := fetchPaxsenixBody(c.httpClient, "https://lyrics.paxsenix.org/genius/lyrics", params)
+	if err != nil {
+		return nil, fmt.Errorf("genius lyrics fetch failed: %w", err)
+	}
+	return parsePaxsenixLyricsPayload(raw, "Genius", false)
+}
+
+func scoreLyricsSearchCandidate(candidateTrack, candidateArtist string, candidateDuration float64, trackName, artistName string, durationSec float64) int {
+	normalizedTrack := strings.ToLower(strings.TrimSpace(simplifyTrackName(trackName)))
+	normalizedArtist := strings.ToLower(strings.TrimSpace(normalizeArtistName(artistName)))
+	candidateTrack = strings.ToLower(strings.TrimSpace(simplifyTrackName(candidateTrack)))
+	candidateArtist = strings.ToLower(strings.TrimSpace(normalizeArtistName(candidateArtist)))
+
+	score := 0
+	switch {
+	case candidateTrack == normalizedTrack:
+		score += 50
+	case strings.Contains(candidateTrack, normalizedTrack) || strings.Contains(normalizedTrack, candidateTrack):
+		score += 25
+	}
+
+	switch {
+	case candidateArtist == normalizedArtist:
+		score += 60
+	case strings.Contains(candidateArtist, normalizedArtist) || strings.Contains(normalizedArtist, candidateArtist):
+		score += 30
+	}
+
+	if durationSec > 0 && candidateDuration > 0 {
+		diff := math.Abs(candidateDuration - durationSec)
+		if diff <= durationToleranceSec {
+			score += 20
+		}
+	}
+
+	return score
+}
+
+func parseClockDuration(value string) float64 {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return 0
+	}
+
+	parts := strings.Split(value, ":")
+	total := 0
+	for _, part := range parts {
+		n, err := strconv.Atoi(strings.TrimSpace(part))
+		if err != nil {
+			return 0
+		}
+		total = total*60 + n
+	}
+	return float64(total)
+}

go_backend/lyrics_qqmusic.go

@@ -87,7 +87,7 @@ func formatQQLyricsMetadataToLRC(rawJSON string, multiPersonWordByWord bool) (st
 	if len(response.Lyrics) == 0 {
 		return "", fmt.Errorf("qq metadata lyrics response was empty")
 	}
-	return formatPaxContent("Syllable", response.Lyrics, multiPersonWordByWord), nil
+	return formatPaxContent("Syllable", response.Lyrics, multiPersonWordByWord, true), nil
 }
 
 func (c *QQMusicClient) FetchLyrics(
@@ -106,7 +106,7 @@ func (c *QQMusicClient) FetchLyrics(
 
 	lrcText, err := formatQQLyricsMetadataToLRC(rawLyrics, multiPersonWordByWord)
 	if err != nil {
-		if fallback, fallbackErr := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord); fallbackErr == nil {
+		if fallback, fallbackErr := formatPaxLyricsToLRC(rawLyrics, multiPersonWordByWord, true); fallbackErr == nil {
 			lrcText = fallback
 		} else {
 			lrcText = rawLyrics

go_backend/lyrics_supplement_test.go

@@ -156,13 +156,27 @@ func TestExternalLyricsProvidersWithFakeHTTP(t *testing.T) {
 	if err != nil || !strings.Contains(rawApple, "Syllable") {
 		t.Fatalf("apple raw = %q/%v", rawApple, err)
 	}
-	appleLyrics, err := apple.FetchLyrics("Song", "Artist", 180, true)
+	appleLyrics, err := apple.FetchLyrics("Song", "Artist", 180, true, true)
 	if err != nil || appleLyrics.SyncType != "LINE_SYNCED" || appleLyrics.Provider != "Apple Music" {
 		t.Fatalf("apple lyrics = %#v/%v", appleLyrics, err)
 	}
-	if plain, err := formatPaxLyricsToLRC(`[{"timestamp":2000,"text":[{"text":"Plain","part":false}]}]`, false); err != nil || !strings.Contains(plain, "Plain") {
+	if plain, err := formatPaxLyricsToLRC(`[{"timestamp":2000,"text":[{"text":"Plain","part":false}]}]`, false, false); err != nil || !strings.Contains(plain, "Plain") {
 		t.Fatalf("direct pax = %q/%v", plain, err)
 	}
+	lineOnly, err := formatPaxLyricsToLRC(paxJSON, true, false)
+	if err != nil {
+		t.Fatalf("line-only pax = %v", err)
+	}
+	if strings.Contains(lineOnly, "<00:") {
+		t.Fatalf("line-only pax should not include inline word timing: %q", lineOnly)
+	}
+	elrc, err := formatPaxLyricsToLRC(paxJSON, true, true)
+	if err != nil {
+		t.Fatalf("elrc pax = %v", err)
+	}
+	if !strings.Contains(elrc, "<00:") {
+		t.Fatalf("elrc pax should include inline word timing: %q", elrc)
+	}
 	if _, err := apple.SearchSong("", "", 0); err == nil {
 		t.Fatal("expected empty apple search error")
 	}
@@ -233,4 +247,72 @@ func TestExternalLyricsProvidersWithFakeHTTP(t *testing.T) {
 	if _, err := formatQQLyricsMetadataToLRC(`{"lyrics":[]}`, false); err == nil {
 		t.Fatal("expected empty QQ metadata error")
 	}
+
+	spotify := &SpotifyLyricsClient{httpClient: &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		switch {
+		case strings.Contains(req.URL.Path, "/spotify/search"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`[{"trackId":"spotify-1","name":"Song","artistName":"Artist","duration":"03:00"}]`)), Request: req}, nil
+		case strings.Contains(req.URL.Path, "/spotify/lyrics"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`"[00:01.00]Spotify"`)), Request: req}, nil
+		default:
+			return &http.Response{StatusCode: 404, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{}`)), Request: req}, nil
+		}
+	})}}
+	spotifyLyrics, err := spotify.FetchLyrics("", "Song", "Artist", 180)
+	if err != nil || spotifyLyrics.Provider != "Spotify" || spotifyLyrics.SyncType != "LINE_SYNCED" {
+		t.Fatalf("spotify lyrics = %#v/%v", spotifyLyrics, err)
+	}
+
+	deezer := &DeezerLyricsClient{httpClient: &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{"lyrics":[{"timestamp":1000,"text":[{"text":"Deezer","part":false}]}]}`)), Request: req}, nil
+	})}}
+	deezerLyrics, err := deezer.FetchLyricsByID("123", false)
+	if err != nil || deezerLyrics.Provider != "Deezer" || deezerLyrics.SyncType != "LINE_SYNCED" {
+		t.Fatalf("deezer lyrics = %#v/%v", deezerLyrics, err)
+	}
+
+	youtube := &YouTubeLyricsClient{httpClient: &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		switch {
+		case strings.Contains(req.URL.Path, "/youtube/search"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`[{"videoId":"yt-1","title":"Song","author":"Artist","duration":"3:00"}]`)), Request: req}, nil
+		case strings.Contains(req.URL.Path, "/youtube/lyrics"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`"[00:01.00]YouTube"`)), Request: req}, nil
+		default:
+			return &http.Response{StatusCode: 404, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{}`)), Request: req}, nil
+		}
+	})}}
+	youtubeLyrics, err := youtube.FetchLyrics("Song", "Artist", 180)
+	if err != nil || youtubeLyrics.Provider != "YouTube" || youtubeLyrics.SyncType != "LINE_SYNCED" {
+		t.Fatalf("youtube lyrics = %#v/%v", youtubeLyrics, err)
+	}
+
+	kugou := &KugouLyricsClient{httpClient: &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		switch {
+		case strings.Contains(req.URL.Path, "/kugou/search"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`[{"hash":"kg-1","title":"Song","artist":"Artist","duration":180}]`)), Request: req}, nil
+		case strings.Contains(req.URL.Path, "/kugou/lyrics"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{"lyrics_text":"[00:01.00]Kugou"}`)), Request: req}, nil
+		default:
+			return &http.Response{StatusCode: 404, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{}`)), Request: req}, nil
+		}
+	})}}
+	kugouLyrics, err := kugou.FetchLyrics("Song", "Artist", 180)
+	if err != nil || kugouLyrics.Provider != "Kugou" || kugouLyrics.SyncType != "LINE_SYNCED" {
+		t.Fatalf("kugou lyrics = %#v/%v", kugouLyrics, err)
+	}
+
+	genius := &GeniusLyricsClient{httpClient: &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		switch {
+		case strings.Contains(req.URL.Path, "/api/search/multi"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{"response":{"sections":[{"hits":[{"type":"song","result":{"title":"Song","primary_artist_names":"Artist","url":"https://genius.com/artist-song-lyrics"}}]}]}}`)), Request: req}, nil
+		case strings.Contains(req.URL.Path, "/genius/lyrics"):
+			return &http.Response{StatusCode: 200, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{"error":false,"lyrics":"Genius line"}`)), Request: req}, nil
+		default:
+			return &http.Response{StatusCode: 404, Header: make(http.Header), Body: io.NopCloser(strings.NewReader(`{}`)), Request: req}, nil
+		}
+	})}}
+	geniusLyrics, err := genius.FetchLyrics("Song", "Artist", 180)
+	if err != nil || geniusLyrics.Provider != "Genius" || geniusLyrics.SyncType != "UNSYNCED" {
+		t.Fatalf("genius lyrics = %#v/%v", geniusLyrics, err)
+	}
 }

go_backend/metadata.go

@@ -872,7 +872,7 @@ func ExtractLyrics(filePath string) (string, error) {
 		return extractLyricsFromSidecarLRC(filePath)
 	}
 
-	if strings.HasSuffix(lower, ".m4a") || strings.HasSuffix(lower, ".aac") {
+	if strings.HasSuffix(lower, ".m4a") || strings.HasSuffix(lower, ".mp4") || strings.HasSuffix(lower, ".aac") {
 		lyrics, err := extractLyricsFromM4A(filePath)
 		if err == nil && strings.TrimSpace(lyrics) != "" {
 			return lyrics, nil
@@ -1578,10 +1578,12 @@ func looksLikeEmbeddedLyrics(value string) bool {
 }
 
 type AudioQuality struct {
-	BitDepth     int   `json:"bit_depth"`
-	SampleRate   int   `json:"sample_rate"`
-	TotalSamples int64 `json:"total_samples"`
-	Duration     int   `json:"duration"`
+	BitDepth     int    `json:"bit_depth"`
+	SampleRate   int    `json:"sample_rate"`
+	TotalSamples int64  `json:"total_samples"`
+	Duration     int    `json:"duration"`
+	Bitrate      int    `json:"bitrate,omitempty"` // kbps, estimated for compressed MP4-family streams
+	Codec        string `json:"codec,omitempty"`
 }
 
 func GetAudioQuality(filePath string) (AudioQuality, error) {
@@ -1632,6 +1634,7 @@ func GetAudioQuality(filePath string) (AudioQuality, error) {
 			SampleRate:   sampleRate,
 			TotalSamples: totalSamples,
 			Duration:     duration,
+			Codec:        "flac",
 		}, nil
 	}
 
@@ -1695,9 +1698,11 @@ func GetM4AQuality(filePath string) (AudioQuality, error) {
 	//   [26:28] reserved
 	//   [28:32] samplerate (16.16 fixed-point)
 	sampleRate := int(buf[28])<<8 | int(buf[29])
-	bitDepth := int(buf[22])<<8 | int(buf[23])
+	bitDepth := 0
+	codec := normalizeM4AAudioCodec(atomType)
 
 	if atomType == "alac" {
+		bitDepth = int(buf[22])<<8 | int(buf[23])
 		if alacBitDepth, alacSampleRate, ok := readALACSpecificConfig(f, sampleOffset, fileSize); ok {
 			if alacBitDepth > 0 {
 				bitDepth = alacBitDepth
@@ -1706,24 +1711,75 @@ func GetM4AQuality(filePath string) (AudioQuality, error) {
 				sampleRate = alacSampleRate
 			}
 		}
+	} else if atomType == "fLaC" {
+		bitDepth = int(buf[22])<<8 | int(buf[23])
+		if flacBitDepth, flacSampleRate, flacTotalSamples, ok := readMP4FLACSpecificConfig(f, sampleOffset, fileSize); ok {
+			if flacBitDepth > 0 {
+				bitDepth = flacBitDepth
+			}
+			if flacSampleRate > 0 {
+				sampleRate = flacSampleRate
+			}
+			if flacTotalSamples > 0 && sampleRate > 0 && duration <= 0 {
+				duration = int(flacTotalSamples / int64(sampleRate))
+			}
+		}
 	}
 
-	if bitDepth <= 0 {
-		bitDepth = 16
+	bitrate := estimateAudioBitrateKbps(fileSize, duration)
+	if bitrate > 0 && bitrate < 16 {
+		bitrate = 0
 	}
+	return AudioQuality{
+		BitDepth:   bitDepth,
+		SampleRate: sampleRate,
+		Duration:   duration,
+		Bitrate:    bitrate,
+		Codec:      codec,
+	}, nil
+}
 
-	return AudioQuality{BitDepth: bitDepth, SampleRate: sampleRate, Duration: duration}, nil
+func normalizeM4AAudioCodec(atomType string) string {
+	switch atomType {
+	case "mp4a":
+		return "aac"
+	case "alac":
+		return "alac"
+	case "fLaC":
+		return "flac"
+	case "ec-3":
+		return "eac3"
+	case "ac-3":
+		return "ac3"
+	case "ac-4":
+		return "ac4"
+	default:
+		return strings.TrimSpace(atomType)
+	}
+}
+
+func estimateAudioBitrateKbps(fileSize int64, durationSeconds int) int {
+	if fileSize <= 0 || durationSeconds <= 0 {
+		return 0
+	}
+	return int(math.Round(float64(fileSize*8) / float64(durationSeconds) / 1000.0))
 }
 
 func readM4ADurationSeconds(f *os.File, moovHeader atomHeader, fileSize int64) int {
 	childStart := moovHeader.offset + moovHeader.headerSize
 	childSize := moovHeader.size - moovHeader.headerSize
 	mvhdHeader, found, err := findAtomInRange(f, childStart, childSize, "mvhd", fileSize)
-	if err != nil || !found {
-		return 0
+	if err == nil && found {
+		if duration := readMP4DurationAtomSeconds(f, mvhdHeader, fileSize); duration > 0 {
+			return duration
+		}
 	}
 
-	payloadOffset := mvhdHeader.offset + mvhdHeader.headerSize
+	return readM4ATrackDurationSeconds(f, moovHeader, fileSize)
+}
+
+func readMP4DurationAtomSeconds(f *os.File, header atomHeader, fileSize int64) int {
+	payloadOffset := header.offset + header.headerSize
 	versionBuf := make([]byte, 1)
 	if _, err := f.ReadAt(versionBuf, payloadOffset); err != nil {
 		return 0
@@ -1754,6 +1810,53 @@ func readM4ADurationSeconds(f *os.File, moovHeader atomHeader, fileSize int64) i
 	return int(math.Round(float64(duration) / float64(timescale)))
 }
 
+func readM4ATrackDurationSeconds(f *os.File, moovHeader atomHeader, fileSize int64) int {
+	childStart := moovHeader.offset + moovHeader.headerSize
+	childSize := moovHeader.size - moovHeader.headerSize
+	bestDuration := 0
+	_ = walkMP4AtomsInRange(f, childStart, childSize, fileSize, func(header atomHeader) bool {
+		if header.typ == "mdhd" {
+			if duration := readMP4DurationAtomSeconds(f, header, fileSize); duration > bestDuration {
+				bestDuration = duration
+			}
+			return false
+		}
+		return header.typ == "trak" || header.typ == "mdia"
+	})
+	return bestDuration
+}
+
+func walkMP4AtomsInRange(f *os.File, start, size, fileSize int64, visit func(atomHeader) bool) error {
+	if size <= 0 {
+		return nil
+	}
+
+	end := start + size
+	for pos := start; pos+8 <= end; {
+		header, err := readAtomHeaderAt(f, pos, fileSize)
+		if err != nil {
+			return err
+		}
+		atomSize := header.size
+		if atomSize == 0 {
+			atomSize = end - pos
+		}
+		if atomSize < header.headerSize {
+			return fmt.Errorf("invalid atom size for %s", header.typ)
+		}
+		header.size = atomSize
+		if visit(header) {
+			childStart := header.offset + header.headerSize
+			childSize := header.size - header.headerSize
+			if err := walkMP4AtomsInRange(f, childStart, childSize, fileSize, visit); err != nil {
+				return err
+			}
+		}
+		pos += atomSize
+	}
+	return nil
+}
+
 func readALACSpecificConfig(f *os.File, sampleOffset, fileSize int64) (int, int, bool) {
 	if sampleOffset < 4 {
 		return 0, 0, false
@@ -1788,6 +1891,79 @@ func readALACSpecificConfig(f *os.File, sampleOffset, fileSize int64) (int, int,
 	return parseALACSpecificConfig(payload)
 }
 
+func readMP4FLACSpecificConfig(f *os.File, sampleOffset, fileSize int64) (int, int, int64, bool) {
+	if sampleOffset < 4 {
+		return 0, 0, 0, false
+	}
+
+	sampleEntryHeader, err := readAtomHeaderAt(f, sampleOffset-4, fileSize)
+	if err != nil {
+		return 0, 0, 0, false
+	}
+
+	childStart := sampleOffset + 32
+	childEnd := sampleEntryHeader.offset + sampleEntryHeader.size
+	if childStart >= childEnd {
+		return 0, 0, 0, false
+	}
+
+	configHeader, found, err := findAtomInRange(f, childStart, childEnd-childStart, "dfLa", fileSize)
+	if err != nil || !found {
+		return 0, 0, 0, false
+	}
+
+	payloadSize := configHeader.size - configHeader.headerSize
+	if payloadSize <= 0 {
+		return 0, 0, 0, false
+	}
+
+	payload := make([]byte, payloadSize)
+	if _, err := f.ReadAt(payload, configHeader.offset+configHeader.headerSize); err != nil {
+		return 0, 0, 0, false
+	}
+
+	return parseMP4FLACSpecificConfig(payload)
+}
+
+func parseMP4FLACSpecificConfig(payload []byte) (int, int, int64, bool) {
+	if len(payload) >= 4 && string(payload[:4]) == "fLaC" {
+		payload = payload[4:]
+	} else if len(payload) >= 4 {
+		// FLACSpecificBox starts with a full-box version/flags field.
+		payload = payload[4:]
+	}
+
+	for len(payload) >= 4 {
+		blockType := payload[0] & 0x7F
+		blockLen := int(payload[1])<<16 | int(payload[2])<<8 | int(payload[3])
+		if blockLen < 0 || len(payload) < 4+blockLen {
+			return 0, 0, 0, false
+		}
+		block := payload[4 : 4+blockLen]
+		if blockType == 0 && len(block) >= 34 {
+			bitDepth, sampleRate, totalSamples := parseFLACStreamInfoQuality(block[:34])
+			return bitDepth, sampleRate, totalSamples, bitDepth > 0 || sampleRate > 0
+		}
+		payload = payload[4+blockLen:]
+	}
+
+	return 0, 0, 0, false
+}
+
+func parseFLACStreamInfoQuality(streamInfo []byte) (int, int, int64) {
+	if len(streamInfo) < 18 {
+		return 0, 0, 0
+	}
+	sampleRate := (int(streamInfo[10]) << 12) | (int(streamInfo[11]) << 4) | (int(streamInfo[12]) >> 4)
+	bitsPerSample := (((int(streamInfo[12]) & 0x01) << 4) | (int(streamInfo[13]) >> 4)) + 1
+	totalSamples := int64(streamInfo[13]&0x0F)<<32 |
+		int64(streamInfo[14])<<24 |
+		int64(streamInfo[15])<<16 |
+		int64(streamInfo[16])<<8 |
+		int64(streamInfo[17])
+	return bitsPerSample, sampleRate, totalSamples
+}
+
 func parseALACSpecificConfig(payload []byte) (int, int, bool) {
 	if len(payload) < 24 {
 		return 0, 0, false
@@ -1882,8 +2058,14 @@ func findAtomInRange(f *os.File, start, size int64, target string, fileSize int6
 
 func findAudioSampleEntry(f *os.File, start, end, fileSize int64) (int64, string, error) {
 	const chunkSize = 64 * 1024
-	patternMP4A := []byte("mp4a")
-	patternALAC := []byte("alac")
+	patterns := [][]byte{
+		[]byte("mp4a"),
+		[]byte("alac"),
+		[]byte("fLaC"),
+		[]byte("ec-3"),
+		[]byte("ac-3"),
+		[]byte("ac-4"),
+	}
 
 	var tail []byte
 	readPos := start
@@ -1904,26 +2086,14 @@ func findAudioSampleEntry(f *os.File, start, end, fileSize int64) (int64, string
 		}
 
 		data := append(tail, buf[:n]...)
-		mp4aIdx := bytes.Index(data, patternMP4A)
-		alacIdx := bytes.Index(data, patternALAC)
-
 		bestIdx := -1
 		bestType := ""
-		switch {
-		case mp4aIdx >= 0 && alacIdx >= 0:
-			if mp4aIdx <= alacIdx {
-				bestIdx = mp4aIdx
-				bestType = "mp4a"
-			} else {
-				bestIdx = alacIdx
-				bestType = "alac"
+		for _, pattern := range patterns {
+			idx := bytes.Index(data, pattern)
+			if idx >= 0 && (bestIdx < 0 || idx < bestIdx) {
+				bestIdx = idx
+				bestType = string(pattern)
 			}
-		case mp4aIdx >= 0:
-			bestIdx = mp4aIdx
-			bestType = "mp4a"
-		case alacIdx >= 0:
-			bestIdx = alacIdx
-			bestType = "alac"
 		}
 
 		if bestIdx >= 0 {

go_backend/metadata_m4a_quality_test.go

@@ -47,3 +47,53 @@ func TestParseALACSpecificConfigRejectsShortPayload(t *testing.T) {
 		t.Fatal("expected short ALAC payload to be rejected")
 	}
 }
+
+func TestM4ACodecFormatMapping(t *testing.T) {
+	cases := map[string]string{
+		"mp4a": "aac",
+		"alac": "alac",
+		"fLaC": "flac",
+		"ec-3": "eac3",
+		"ac-3": "ac3",
+		"ac-4": "ac4",
+	}
+	for atomType, want := range cases {
+		if got := normalizeM4AAudioCodec(atomType); got != want {
+			t.Fatalf("normalizeM4AAudioCodec(%q) = %q, want %q", atomType, got, want)
+		}
+	}
+
+	if got := libraryFormatForM4ACodec("flac"); got != "flac" {
+		t.Fatalf("libraryFormatForM4ACodec(flac) = %q", got)
+	}
+	if got := libraryFormatForM4ACodec("eac3"); got != "eac3" {
+		t.Fatalf("libraryFormatForM4ACodec(eac3) = %q", got)
+	}
+	if got := libraryFormatForM4ACodec("aac"); got != "m4a" {
+		t.Fatalf("libraryFormatForM4ACodec(aac) = %q", got)
+	}
+}
+
+func TestParseMP4FLACSpecificConfig(t *testing.T) {
+	streamInfo := make([]byte, 34)
+	sampleRate := 48000
+	bitsPerSample := 24
+	totalSamples := int64(48000 * 180)
+	streamInfo[10] = byte(sampleRate >> 12)
+	streamInfo[11] = byte(sampleRate >> 4)
+	streamInfo[12] = byte((sampleRate&0x0F)<<4 | ((bitsPerSample-1)>>4)&0x01)
+	streamInfo[13] = byte(((bitsPerSample-1)&0x0F)<<4 | int((totalSamples>>32)&0x0F))
+	streamInfo[14] = byte(totalSamples >> 24)
+	streamInfo[15] = byte(totalSamples >> 16)
+	streamInfo[16] = byte(totalSamples >> 8)
+	streamInfo[17] = byte(totalSamples)
+
+	payload := append([]byte{0, 0, 0, 0, 0, 0, 0, 34}, streamInfo...)
+	bitDepth, parsedRate, parsedSamples, ok := parseMP4FLACSpecificConfig(payload)
+	if !ok {
+		t.Fatal("expected MP4 FLAC config to parse")
+	}
+	if bitDepth != bitsPerSample || parsedRate != sampleRate || parsedSamples != totalSamples {
+		t.Fatalf("FLAC config = %d/%d/%d", bitDepth, parsedRate, parsedSamples)
+	}
+}

lib/constants/app_info.dart

@@ -1,8 +1,8 @@
 import 'package:flutter/foundation.dart';
 
 class AppInfo {
-  static const String version = '4.5.1';
-  static const String buildNumber = '128';
+  static const String version = '4.5.5';
+  static const String buildNumber = '132';
   static const String fullVersion = '$version+$buildNumber';
 
   static String get displayVersion => kDebugMode ? 'Internal' : version;
@@ -17,6 +17,8 @@ class AppInfo {
   static const String githubUrl = 'https://github.com/$githubRepo';
   static const String originalGithubUrl =
       'https://github.com/afkarxyz/SpotiFLAC';
+  static const String remoteConfigApiUrl =
+      'https://api.zarz.moe/v1/spotiflac-mobile/config';
 
   static const String kofiUrl = 'https://ko-fi.com/zarzet';
   static const String githubSponsorsUrl = 'https://github.com/sponsors/zarzet/';

lib/l10n/app_localizations.dart

@@ -837,7 +837,7 @@ abstract class AppLocalizations {
   /// App description in header card
   ///
   /// In en, this message translates to:
-  /// **'Download Spotify tracks in lossless quality from Tidal and Qobuz.'**
+  /// **'Search music metadata, manage extensions, and organize your library.'**
   String get aboutAppDescription;
 
   /// Section header for artist albums
@@ -2286,6 +2286,12 @@ abstract class AppLocalizations {
   /// **'Copy lyrics'**
   String get trackCopyLyrics;
 
+  /// Label showing the lyrics source/provider
+  ///
+  /// In en, this message translates to:
+  /// **'Source: {source}'**
+  String trackLyricsSource(String source);
+
   /// Message when lyrics not found
   ///
   /// In en, this message translates to:
@@ -2838,6 +2844,18 @@ abstract class AppLocalizations {
   /// **'Best compatibility, ~10MB per track'**
   String get downloadLossyMp3Subtitle;
 
+  /// Tidal lossy format option - AAC in M4A container at 320kbps
+  ///
+  /// In en, this message translates to:
+  /// **'AAC/M4A 320kbps'**
+  String get downloadLossyAac;
+
+  /// Subtitle for AAC/M4A 320kbps Tidal lossy option
+  ///
+  /// In en, this message translates to:
+  /// **'Best mobile compatibility, M4A container'**
+  String get downloadLossyAacSubtitle;
+
   /// Tidal lossy format option - Opus 256kbps
   ///
   /// In en, this message translates to:
@@ -4299,7 +4317,7 @@ abstract class AppLocalizations {
   /// Subtitle for convert format menu item
   ///
   /// In en, this message translates to:
-  /// **'Convert to MP3, Opus, ALAC, or FLAC'**
+  /// **'Convert to AAC/M4A, MP3, Opus, ALAC, or FLAC'**
   String get trackConvertFormatSubtitle;
 
   /// Title of convert bottom sheet
@@ -5209,6 +5227,24 @@ abstract class AppLocalizations {
   /// **'Standard lyrics without speaker labels'**
   String get downloadAppleQqMultiPersonDisabled;
 
+  /// Setting for preserving Apple Music word-by-word eLRC timestamps
+  ///
+  /// In en, this message translates to:
+  /// **'Apple Music eLRC Word Sync'**
+  String get downloadAppleElrcWordSync;
+
+  /// Subtitle when Apple Music eLRC word sync is enabled
+  ///
+  /// In en, this message translates to:
+  /// **'Raw word-by-word timestamps preserved'**
+  String get downloadAppleElrcWordSyncEnabled;
+
+  /// Subtitle when Apple Music eLRC word sync is disabled
+  ///
+  /// In en, this message translates to:
+  /// **'Safer line-by-line Apple Music lyrics'**
+  String get downloadAppleElrcWordSyncDisabled;
+
   /// Setting for Musixmatch lyrics translation language
   ///
   /// In en, this message translates to:
@@ -5563,6 +5599,24 @@ abstract class AppLocalizations {
   /// **'Sample Rate'**
   String get audioAnalysisSampleRate;
 
+  /// Audio codec metric label
+  ///
+  /// In en, this message translates to:
+  /// **'Codec'**
+  String get audioAnalysisCodec;
+
+  /// Audio container metric label
+  ///
+  /// In en, this message translates to:
+  /// **'Container'**
+  String get audioAnalysisContainer;
+
+  /// Decoded sample format metric label
+  ///
+  /// In en, this message translates to:
+  /// **'Decoded Format'**
+  String get audioAnalysisDecodedFormat;
+
   /// Bit depth metric label
   ///
   /// In en, this message translates to:
@@ -5611,12 +5665,60 @@ abstract class AppLocalizations {
   /// **'RMS'**
   String get audioAnalysisRms;
 
+  /// Integrated loudness metric label
+  ///
+  /// In en, this message translates to:
+  /// **'LUFS'**
+  String get audioAnalysisLufs;
+
+  /// True peak metric label
+  ///
+  /// In en, this message translates to:
+  /// **'True Peak'**
+  String get audioAnalysisTruePeak;
+
+  /// Clipping metric label
+  ///
+  /// In en, this message translates to:
+  /// **'Clipping'**
+  String get audioAnalysisClipping;
+
+  /// Displayed when no clipped samples were detected
+  ///
+  /// In en, this message translates to:
+  /// **'No clipping'**
+  String get audioAnalysisNoClipping;
+
+  /// Estimated spectral cutoff metric label
+  ///
+  /// In en, this message translates to:
+  /// **'Spectral Cutoff'**
+  String get audioAnalysisSpectralCutoff;
+
+  /// Per-channel audio analysis section label
+  ///
+  /// In en, this message translates to:
+  /// **'Per-channel Stats'**
+  String get audioAnalysisChannelStats;
+
   /// Total samples metric label
   ///
   /// In en, this message translates to:
   /// **'Samples'**
   String get audioAnalysisSamples;
 
+  /// Tooltip/label for the button that re-runs the audio analysis, discarding cached results
+  ///
+  /// In en, this message translates to:
+  /// **'Re-analyze'**
+  String get audioAnalysisRescan;
+
+  /// Loading text while audio is being re-analyzed after an explicit refresh
+  ///
+  /// In en, this message translates to:
+  /// **'Re-analyzing audio...'**
+  String get audioAnalysisRescanning;
+
   /// Extensions page - subtitle for built-in search provider option
   ///
   /// In en, this message translates to:
@@ -6416,6 +6518,470 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Choose which extensions can be used as fallback'**
   String get downloadFallbackExtensionsSubtitle;
+
+  /// Hint text for the edit metadata date field
+  ///
+  /// In en, this message translates to:
+  /// **'YYYY-MM-DD or YYYY'**
+  String get editMetadataFieldDateHint;
+
+  /// Label for total tracks field in the edit metadata sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Track Total'**
+  String get editMetadataFieldTrackTotal;
+
+  /// Label for total discs field in the edit metadata sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Disc Total'**
+  String get editMetadataFieldDiscTotal;
+
+  /// Label for composer field in the edit metadata sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Composer'**
+  String get editMetadataFieldComposer;
+
+  /// Label for comment field in the edit metadata sheet
+  ///
+  /// In en, this message translates to:
+  /// **'Comment'**
+  String get editMetadataFieldComment;
+
+  /// Expandable section label for advanced metadata fields
+  ///
+  /// In en, this message translates to:
+  /// **'Advanced'**
+  String get editMetadataAdvanced;
+
+  /// Filter option - items missing track number
+  ///
+  /// In en, this message translates to:
+  /// **'Missing track number'**
+  String get libraryFilterMetadataMissingTrackNumber;
+
+  /// Filter option - items missing disc number
+  ///
+  /// In en, this message translates to:
+  /// **'Missing disc number'**
+  String get libraryFilterMetadataMissingDiscNumber;
+
+  /// Filter option - items missing artist
+  ///
+  /// In en, this message translates to:
+  /// **'Missing artist'**
+  String get libraryFilterMetadataMissingArtist;
+
+  /// Filter option - items with an invalid ISRC format
+  ///
+  /// In en, this message translates to:
+  /// **'Incorrect ISRC format'**
+  String get libraryFilterMetadataIncorrectIsrcFormat;
+
+  /// Filter option - items missing record label
+  ///
+  /// In en, this message translates to:
+  /// **'Missing label'**
+  String get libraryFilterMetadataMissingLabel;
+
+  /// Confirmation message for deleting selected playlists
+  ///
+  /// In en, this message translates to:
+  /// **'Delete {count} {count, plural, =1{playlist} other{playlists}}?'**
+  String collectionDeletePlaylistsMessage(int count);
+
+  /// Snackbar after deleting selected playlists
+  ///
+  /// In en, this message translates to:
+  /// **'{count} {count, plural, =1{playlist} other{playlists}} deleted'**
+  String collectionPlaylistsDeleted(int count);
+
+  /// Snackbar after adding multiple tracks to a playlist
+  ///
+  /// In en, this message translates to:
+  /// **'Added {count} {count, plural, =1{track} other{tracks}} to {playlistName}'**
+  String collectionAddedTracksToPlaylist(int count, String playlistName);
+
+  /// Snackbar after adding multiple tracks to a playlist when some were already present
+  ///
+  /// In en, this message translates to:
+  /// **'Added {count} {count, plural, =1{track} other{tracks}} to {playlistName} ({alreadyCount} already in playlist)'**
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  );
+
+  /// Generic item count label
+  ///
+  /// In en, this message translates to:
+  /// **'{count} {count, plural, =1{item} other{items}}'**
+  String itemCount(int count);
+
+  /// Snackbar summary after batch metadata re-enrichment finishes with failures
+  ///
+  /// In en, this message translates to:
+  /// **'Metadata re-enriched successfully ({successCount}/{total}) - Failed: {failedCount}'**
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  );
+
+  /// Button label for deleting selected tracks
+  ///
+  /// In en, this message translates to:
+  /// **'Delete {count} {count, plural, =1{track} other{tracks}}'**
+  String selectionDeleteTracksCount(int count);
+
+  /// Queue status while downloading with speed
+  ///
+  /// In en, this message translates to:
+  /// **'Downloading - {speed} MB/s'**
+  String queueDownloadSpeedStatus(String speed);
+
+  /// Queue status before download progress is available
+  ///
+  /// In en, this message translates to:
+  /// **'Starting...'**
+  String get queueDownloadStarting;
+
+  /// Accessibility label for selecting a track
+  ///
+  /// In en, this message translates to:
+  /// **'Select track'**
+  String get a11ySelectTrack;
+
+  /// Accessibility label for deselecting a track
+  ///
+  /// In en, this message translates to:
+  /// **'Deselect track'**
+  String get a11yDeselectTrack;
+
+  /// Accessibility label for playing a local library track
+  ///
+  /// In en, this message translates to:
+  /// **'Play {trackName} by {artistName}'**
+  String a11yPlayTrackByArtist(String trackName, String artistName);
+
+  /// Store extension result count
+  ///
+  /// In en, this message translates to:
+  /// **'{count} {count, plural, =1{extension} other{extensions}}'**
+  String storeExtensionsCount(int count);
+
+  /// Store compatibility badge for minimum app version
+  ///
+  /// In en, this message translates to:
+  /// **'Requires v{version}+'**
+  String storeRequiresVersion(String version);
+
+  /// Generic action button label
+  ///
+  /// In en, this message translates to:
+  /// **'Go'**
+  String get actionGo;
+
+  /// Header for log issue analysis summary
+  ///
+  /// In en, this message translates to:
+  /// **'Issue Summary'**
+  String get logIssueSummary;
+
+  /// Total error count in log issue analysis
+  ///
+  /// In en, this message translates to:
+  /// **'Total errors: {count}'**
+  String logTotalErrors(int count);
+
+  /// Affected domains in log issue analysis
+  ///
+  /// In en, this message translates to:
+  /// **'Affected: {domains}'**
+  String logAffectedDomains(String domains);
+
+  /// Library scan status when a scan was cancelled
+  ///
+  /// In en, this message translates to:
+  /// **'Scan cancelled'**
+  String get libraryScanCancelled;
+
+  /// Library scan status subtitle after cancellation
+  ///
+  /// In en, this message translates to:
+  /// **'You can retry the scan when ready.'**
+  String get libraryScanCancelledSubtitle;
+
+  /// Library count note for downloaded history items excluded from the local list
+  ///
+  /// In en, this message translates to:
+  /// **'{count} from Downloads history (excluded from list)'**
+  String libraryDownloadsHistoryExcluded(int count);
+
+  /// Setting title for Android native download worker
+  ///
+  /// In en, this message translates to:
+  /// **'Native download worker'**
+  String get downloadNativeWorker;
+
+  /// Setting subtitle for Android native download worker
+  ///
+  /// In en, this message translates to:
+  /// **'Beta Android service worker for extension downloads'**
+  String get downloadNativeWorkerSubtitle;
+
+  /// Badge label for beta features
+  ///
+  /// In en, this message translates to:
+  /// **'BETA'**
+  String get badgeBeta;
+
+  /// Extension detail section header for service status
+  ///
+  /// In en, this message translates to:
+  /// **'Service Status'**
+  String get extensionServiceStatus;
+
+  /// Extension capability label for service health checks
+  ///
+  /// In en, this message translates to:
+  /// **'Service health'**
+  String get extensionServiceHealth;
+
+  /// Extension service health check count
+  ///
+  /// In en, this message translates to:
+  /// **'{count} {count, plural, =1{check} other{checks}} configured'**
+  String extensionHealthChecksConfigured(int count);
+
+  /// Hint for an OAuth login link field before connecting Spotify
+  ///
+  /// In en, this message translates to:
+  /// **'Tap Connect to Spotify to fill this field.'**
+  String get extensionOauthConnectHint;
+
+  /// Timestamp for the latest extension service health check
+  ///
+  /// In en, this message translates to:
+  /// **'Last checked {time}'**
+  String extensionLastChecked(String time);
+
+  /// Tooltip for refreshing extension service health status
+  ///
+  /// In en, this message translates to:
+  /// **'Refresh status'**
+  String get extensionRefreshStatus;
+
+  /// Extension detail section title for custom URL handling
+  ///
+  /// In en, this message translates to:
+  /// **'Custom URL Handling'**
+  String get extensionCustomUrlHandling;
+
+  /// Extension detail subtitle for custom URL handling
+  ///
+  /// In en, this message translates to:
+  /// **'This extension can handle links from these sites'**
+  String get extensionCustomUrlHandlingSubtitle;
+
+  /// Extension detail hint explaining share-to-app URL handling
+  ///
+  /// In en, this message translates to:
+  /// **'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.'**
+  String get extensionCustomUrlHandlingShareHint;
+
+  /// Count of settings exposed by an extension quality option
+  ///
+  /// In en, this message translates to:
+  /// **'{count} {count, plural, =1{setting} other{settings}}'**
+  String extensionSettingsCount(int count);
+
+  /// Extension service health status - online
+  ///
+  /// In en, this message translates to:
+  /// **'Online'**
+  String get extensionHealthOnline;
+
+  /// Extension service health status - degraded
+  ///
+  /// In en, this message translates to:
+  /// **'Degraded'**
+  String get extensionHealthDegraded;
+
+  /// Extension service health status - offline
+  ///
+  /// In en, this message translates to:
+  /// **'Offline'**
+  String get extensionHealthOffline;
+
+  /// Extension service health status - not configured
+  ///
+  /// In en, this message translates to:
+  /// **'Not configured'**
+  String get extensionHealthNotConfigured;
+
+  /// Extension service health status - unknown
+  ///
+  /// In en, this message translates to:
+  /// **'Unknown'**
+  String get extensionHealthUnknown;
+
+  /// Label for a required extension service health check
+  ///
+  /// In en, this message translates to:
+  /// **'required'**
+  String get extensionHealthRequired;
+
+  /// Value shown when an extension setting has no value
+  ///
+  /// In en, this message translates to:
+  /// **'Not set'**
+  String get extensionSettingNotSet;
+
+  /// Fallback error when an extension action fails without details
+  ///
+  /// In en, this message translates to:
+  /// **'Action failed'**
+  String get extensionActionFailed;
+
+  /// Hint for editing an extension setting value
+  ///
+  /// In en, this message translates to:
+  /// **'Enter value'**
+  String get extensionEnterValue;
+
+  /// Tooltip for online extension service
+  ///
+  /// In en, this message translates to:
+  /// **'Service online'**
+  String get extensionHealthServiceOnline;
+
+  /// Tooltip for degraded extension service
+  ///
+  /// In en, this message translates to:
+  /// **'Service degraded'**
+  String get extensionHealthServiceDegraded;
+
+  /// Tooltip for offline extension service
+  ///
+  /// In en, this message translates to:
+  /// **'Service offline'**
+  String get extensionHealthServiceOffline;
+
+  /// Tooltip for unknown extension service health
+  ///
+  /// In en, this message translates to:
+  /// **'Service status unknown'**
+  String get extensionHealthServiceUnknown;
+
+  /// Audio channel layout label - stereo
+  ///
+  /// In en, this message translates to:
+  /// **'Stereo'**
+  String get audioAnalysisStereo;
+
+  /// Audio channel layout label - mono
+  ///
+  /// In en, this message translates to:
+  /// **'Mono'**
+  String get audioAnalysisMono;
+
+  /// Button label to open a track in a named music service
+  ///
+  /// In en, this message translates to:
+  /// **'Open in {serviceName}'**
+  String trackOpenInService(String serviceName);
+
+  /// Lyrics source label for embedded lyrics
+  ///
+  /// In en, this message translates to:
+  /// **'Embedded'**
+  String get trackLyricsEmbeddedSource;
+
+  /// Fallback album name when metadata is missing
+  ///
+  /// In en, this message translates to:
+  /// **'Unknown Album'**
+  String get unknownAlbum;
+
+  /// Fallback artist name when metadata is missing
+  ///
+  /// In en, this message translates to:
+  /// **'Unknown Artist'**
+  String get unknownArtist;
+
+  /// Audio permission type label
+  ///
+  /// In en, this message translates to:
+  /// **'Audio'**
+  String get permissionAudio;
+
+  /// Storage permission type label
+  ///
+  /// In en, this message translates to:
+  /// **'Storage'**
+  String get permissionStorage;
+
+  /// Notification permission type label
+  ///
+  /// In en, this message translates to:
+  /// **'Notification'**
+  String get permissionNotification;
+
+  /// Error when the selected folder is invalid
+  ///
+  /// In en, this message translates to:
+  /// **'Invalid folder selected'**
+  String get errorInvalidFolderSelected;
+
+  /// Error when persistent folder access cannot be saved
+  ///
+  /// In en, this message translates to:
+  /// **'Could not keep access to the selected folder'**
+  String get errorCouldNotKeepFolderAccess;
+
+  /// Store detail value when any app version is accepted
+  ///
+  /// In en, this message translates to:
+  /// **'Any'**
+  String get storeAnyVersion;
+
+  /// Store extension category - metadata
+  ///
+  /// In en, this message translates to:
+  /// **'Metadata'**
+  String get storeCategoryMetadata;
+
+  /// Store extension category - download
+  ///
+  /// In en, this message translates to:
+  /// **'Download'**
+  String get storeCategoryDownload;
+
+  /// Store extension category - utility
+  ///
+  /// In en, this message translates to:
+  /// **'Utility'**
+  String get storeCategoryUtility;
+
+  /// Store extension category - lyrics
+  ///
+  /// In en, this message translates to:
+  /// **'Lyrics'**
+  String get storeCategoryLyrics;
+
+  /// Store extension category - integration
+  ///
+  /// In en, this message translates to:
+  /// **'Integration'**
+  String get storeCategoryIntegration;
+
+  /// Section header for all artist releases
+  ///
+  /// In en, this message translates to:
+  /// **'Releases'**
+  String get artistReleases;
 }
 
 class _AppLocalizationsDelegate

lib/l10n/app_localizations_de.dart

@@ -405,7 +405,7 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Lade Spotify-Titel in verlustfreier Qualität von Tidal und Qobuz herunter.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Alben';
@@ -1237,6 +1237,11 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Lyrics kopieren';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable =>
       'Lyrics sind für diesen Titel nicht verfügbar';
@@ -1547,6 +1552,13 @@ class AppLocalizationsDe extends AppLocalizations {
   String get downloadLossyMp3Subtitle =>
       'Beste Kompatibilität, ~10MB pro Titel';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3049,6 +3061,17 @@ class AppLocalizationsDe extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3295,6 +3318,15 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit-Tiefe';
 
@@ -3319,9 +3351,33 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Proben';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3833,4 +3889,337 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_en.dart

@@ -397,7 +397,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -2408,7 +2420,7 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get trackConvertFormatSubtitle =>
-      'Convert to MP3, Opus, ALAC, or FLAC';
+      'Convert to AAC/M4A, MP3, Opus, ALAC, or FLAC';
 
   @override
   String get trackConvertTitle => 'Convert Audio';
@@ -3015,6 +3027,17 @@ class AppLocalizationsEn extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Standard lyrics without speaker labels';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3260,6 +3283,15 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3284,9 +3316,33 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3804,4 +3860,337 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_es.dart

@@ -397,7 +397,7 @@ class AppLocalizationsEs extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3015,6 +3027,17 @@ class AppLocalizationsEs extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Standard lyrics without speaker labels';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3260,6 +3283,15 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3284,9 +3316,33 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3798,6 +3854,339 @@ class AppLocalizationsEs extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }
 
 /// The translations for Spanish Castilian, as used in Spain (`es_ES`).
@@ -4196,7 +4585,7 @@ class AppLocalizationsEsEs extends AppLocalizationsEs {
 
   @override
   String get aboutAppDescription =>
-      'Descargar pistas de Spotify en alta calidad (sin pérdida) de Tidal y Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Álbumes';
@@ -7049,6 +7438,12 @@ class AppLocalizationsEsEs extends AppLocalizationsEs {
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';

lib/l10n/app_localizations_fr.dart

@@ -399,7 +399,7 @@ class AppLocalizationsFr extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1223,6 +1223,11 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1526,6 +1531,13 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3018,6 +3030,17 @@ class AppLocalizationsFr extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3264,6 +3287,15 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3288,9 +3320,33 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3802,4 +3858,337 @@ class AppLocalizationsFr extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_hi.dart

@@ -397,7 +397,7 @@ class AppLocalizationsHi extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3015,6 +3027,17 @@ class AppLocalizationsHi extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3261,6 +3284,15 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3285,9 +3317,33 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3799,4 +3855,337 @@ class AppLocalizationsHi extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_id.dart

@@ -400,7 +400,7 @@ class AppLocalizationsId extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Unduh lagu-lagu Spotify dalam kualitas lossless dari Tidal dan Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Album';
@@ -1226,6 +1226,11 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Salin lirik';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lirik tidak tersedia untuk lagu ini';
 
@@ -1531,6 +1536,13 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3024,6 +3036,17 @@ class AppLocalizationsId extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3270,6 +3293,15 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3294,9 +3326,33 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3790,4 +3846,337 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_ja.dart

@@ -393,7 +393,7 @@ class AppLocalizationsJa extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'アルバム';
@@ -1214,6 +1214,11 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get trackCopyLyrics => '歌詞をコピー';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'このトラックの歌詞は利用できません';
 
@@ -1513,6 +1518,13 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3002,6 +3014,17 @@ class AppLocalizationsJa extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3248,6 +3271,15 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3272,9 +3304,33 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3786,4 +3842,337 @@ class AppLocalizationsJa extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_ko.dart

@@ -385,7 +385,7 @@ class AppLocalizationsKo extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => '앨범';
@@ -1200,6 +1200,11 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1503,6 +1508,13 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -2995,6 +3007,17 @@ class AppLocalizationsKo extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3241,6 +3264,15 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3265,9 +3297,33 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3779,4 +3835,337 @@ class AppLocalizationsKo extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_nl.dart

@@ -397,7 +397,7 @@ class AppLocalizationsNl extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3015,6 +3027,17 @@ class AppLocalizationsNl extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3261,6 +3284,15 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3285,9 +3317,33 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3799,4 +3855,337 @@ class AppLocalizationsNl extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_pt.dart

@@ -397,7 +397,7 @@ class AppLocalizationsPt extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3015,6 +3027,17 @@ class AppLocalizationsPt extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Standard lyrics without speaker labels';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3260,6 +3283,15 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3284,9 +3316,33 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3798,6 +3854,339 @@ class AppLocalizationsPt extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }
 
 /// The translations for Portuguese, as used in Portugal (`pt_PT`).
@@ -4195,7 +4584,7 @@ class AppLocalizationsPtPt extends AppLocalizationsPt {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Álbuns';
@@ -7042,6 +7431,12 @@ class AppLocalizationsPtPt extends AppLocalizationsPt {
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';

lib/l10n/app_localizations_ru.dart

@@ -403,7 +403,7 @@ class AppLocalizationsRu extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Скачивайте треки Spotify в lossless качестве с Tidal и Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Альбомы';
@@ -1238,6 +1238,11 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Копировать текст';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable =>
       'Текст песни недоступен для этого трека';
@@ -1547,6 +1552,13 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3074,6 +3086,17 @@ class AppLocalizationsRu extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3320,6 +3343,15 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3344,9 +3376,33 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3858,4 +3914,337 @@ class AppLocalizationsRu extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_tr.dart

@@ -405,7 +405,7 @@ class AppLocalizationsTr extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Spotify parçalarını Tidal ve Qobuz aracılığıyla kayıpsız kalitede indirin.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albümler';
@@ -1234,6 +1234,11 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Şarkı sözlerini kopyala';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Bu parça için şarkı sözü mevcut değil';
 
@@ -1540,6 +1545,13 @@ class AppLocalizationsTr extends AppLocalizations {
   String get downloadLossyMp3Subtitle =>
       'En iyi uyumluluk, parça başına ~10 Mb';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3041,6 +3053,17 @@ class AppLocalizationsTr extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Simplified word-by-word formatting';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3287,6 +3310,15 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3311,9 +3343,33 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3825,4 +3881,337 @@ class AppLocalizationsTr extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_uk.dart

@@ -407,7 +407,7 @@ class AppLocalizationsUk extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Кінцеві точки потокового передавання Tidal Hi-Res FLAC. Ключовий елемент пазлу музики без втрат.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Альбоми';
@@ -1240,6 +1240,11 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Скопіювати тексти пісень';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable =>
       'Текст пісні для цього треку недоступний';
@@ -1548,6 +1553,13 @@ class AppLocalizationsUk extends AppLocalizations {
   String get downloadLossyMp3Subtitle =>
       'Найкраща сумісність, ~10 МБ на доріжку';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256 кбіт/с';
 
@@ -3067,6 +3079,17 @@ class AppLocalizationsUk extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Спрощене послівне форматування';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Мова Musixmatch';
 
@@ -3316,6 +3339,15 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Частота дискретизації';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Глибина бітів';
 
@@ -3340,9 +3372,33 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Семпли';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Пошук за допомогою$providerName';
@@ -3858,4 +3914,337 @@ class AppLocalizationsUk extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }

lib/l10n/app_localizations_zh.dart

@@ -397,7 +397,7 @@ class AppLocalizationsZh extends AppLocalizations {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -1220,6 +1220,11 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get trackCopyLyrics => 'Copy lyrics';
 
+  @override
+  String trackLyricsSource(String source) {
+    return 'Source: $source';
+  }
+
   @override
   String get trackLyricsNotAvailable => 'Lyrics not available for this track';
 
@@ -1523,6 +1528,13 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get downloadLossyMp3Subtitle => 'Best compatibility, ~10MB per track';
 
+  @override
+  String get downloadLossyAac => 'AAC/M4A 320kbps';
+
+  @override
+  String get downloadLossyAacSubtitle =>
+      'Best mobile compatibility, M4A container';
+
   @override
   String get downloadLossyOpus256 => 'Opus 256kbps';
 
@@ -3015,6 +3027,17 @@ class AppLocalizationsZh extends AppLocalizations {
   String get downloadAppleQqMultiPersonDisabled =>
       'Standard lyrics without speaker labels';
 
+  @override
+  String get downloadAppleElrcWordSync => 'Apple Music eLRC Word Sync';
+
+  @override
+  String get downloadAppleElrcWordSyncEnabled =>
+      'Raw word-by-word timestamps preserved';
+
+  @override
+  String get downloadAppleElrcWordSyncDisabled =>
+      'Safer line-by-line Apple Music lyrics';
+
   @override
   String get downloadMusixmatchLanguage => 'Musixmatch Language';
 
@@ -3260,6 +3283,15 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get audioAnalysisSampleRate => 'Sample Rate';
 
+  @override
+  String get audioAnalysisCodec => 'Codec';
+
+  @override
+  String get audioAnalysisContainer => 'Container';
+
+  @override
+  String get audioAnalysisDecodedFormat => 'Decoded Format';
+
   @override
   String get audioAnalysisBitDepth => 'Bit Depth';
 
@@ -3284,9 +3316,33 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get audioAnalysisRms => 'RMS';
 
+  @override
+  String get audioAnalysisLufs => 'LUFS';
+
+  @override
+  String get audioAnalysisTruePeak => 'True Peak';
+
+  @override
+  String get audioAnalysisClipping => 'Clipping';
+
+  @override
+  String get audioAnalysisNoClipping => 'No clipping';
+
+  @override
+  String get audioAnalysisSpectralCutoff => 'Spectral Cutoff';
+
+  @override
+  String get audioAnalysisChannelStats => 'Per-channel Stats';
+
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -3798,6 +3854,339 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get downloadFallbackExtensionsSubtitle =>
       'Choose which extensions can be used as fallback';
+
+  @override
+  String get editMetadataFieldDateHint => 'YYYY-MM-DD or YYYY';
+
+  @override
+  String get editMetadataFieldTrackTotal => 'Track Total';
+
+  @override
+  String get editMetadataFieldDiscTotal => 'Disc Total';
+
+  @override
+  String get editMetadataFieldComposer => 'Composer';
+
+  @override
+  String get editMetadataFieldComment => 'Comment';
+
+  @override
+  String get editMetadataAdvanced => 'Advanced';
+
+  @override
+  String get libraryFilterMetadataMissingTrackNumber => 'Missing track number';
+
+  @override
+  String get libraryFilterMetadataMissingDiscNumber => 'Missing disc number';
+
+  @override
+  String get libraryFilterMetadataMissingArtist => 'Missing artist';
+
+  @override
+  String get libraryFilterMetadataIncorrectIsrcFormat =>
+      'Incorrect ISRC format';
+
+  @override
+  String get libraryFilterMetadataMissingLabel => 'Missing label';
+
+  @override
+  String collectionDeletePlaylistsMessage(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return 'Delete $count $_temp0?';
+  }
+
+  @override
+  String collectionPlaylistsDeleted(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'playlists',
+      one: 'playlist',
+    );
+    return '$count $_temp0 deleted';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylist(int count, String playlistName) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName';
+  }
+
+  @override
+  String collectionAddedTracksToPlaylistWithExisting(
+    int count,
+    String playlistName,
+    int alreadyCount,
+  ) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Added $count $_temp0 to $playlistName ($alreadyCount already in playlist)';
+  }
+
+  @override
+  String itemCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'items',
+      one: 'item',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String trackReEnrichSuccessWithFailures(
+    int successCount,
+    int total,
+    int failedCount,
+  ) {
+    return 'Metadata re-enriched successfully ($successCount/$total) - Failed: $failedCount';
+  }
+
+  @override
+  String selectionDeleteTracksCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'tracks',
+      one: 'track',
+    );
+    return 'Delete $count $_temp0';
+  }
+
+  @override
+  String queueDownloadSpeedStatus(String speed) {
+    return 'Downloading - $speed MB/s';
+  }
+
+  @override
+  String get queueDownloadStarting => 'Starting...';
+
+  @override
+  String get a11ySelectTrack => 'Select track';
+
+  @override
+  String get a11yDeselectTrack => 'Deselect track';
+
+  @override
+  String a11yPlayTrackByArtist(String trackName, String artistName) {
+    return 'Play $trackName by $artistName';
+  }
+
+  @override
+  String storeExtensionsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'extensions',
+      one: 'extension',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String storeRequiresVersion(String version) {
+    return 'Requires v$version+';
+  }
+
+  @override
+  String get actionGo => 'Go';
+
+  @override
+  String get logIssueSummary => 'Issue Summary';
+
+  @override
+  String logTotalErrors(int count) {
+    return 'Total errors: $count';
+  }
+
+  @override
+  String logAffectedDomains(String domains) {
+    return 'Affected: $domains';
+  }
+
+  @override
+  String get libraryScanCancelled => 'Scan cancelled';
+
+  @override
+  String get libraryScanCancelledSubtitle =>
+      'You can retry the scan when ready.';
+
+  @override
+  String libraryDownloadsHistoryExcluded(int count) {
+    return '$count from Downloads history (excluded from list)';
+  }
+
+  @override
+  String get downloadNativeWorker => 'Native download worker';
+
+  @override
+  String get downloadNativeWorkerSubtitle =>
+      'Beta Android service worker for extension downloads';
+
+  @override
+  String get badgeBeta => 'BETA';
+
+  @override
+  String get extensionServiceStatus => 'Service Status';
+
+  @override
+  String get extensionServiceHealth => 'Service health';
+
+  @override
+  String extensionHealthChecksConfigured(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'checks',
+      one: 'check',
+    );
+    return '$count $_temp0 configured';
+  }
+
+  @override
+  String get extensionOauthConnectHint =>
+      'Tap Connect to Spotify to fill this field.';
+
+  @override
+  String extensionLastChecked(String time) {
+    return 'Last checked $time';
+  }
+
+  @override
+  String get extensionRefreshStatus => 'Refresh status';
+
+  @override
+  String get extensionCustomUrlHandling => 'Custom URL Handling';
+
+  @override
+  String get extensionCustomUrlHandlingSubtitle =>
+      'This extension can handle links from these sites';
+
+  @override
+  String get extensionCustomUrlHandlingShareHint =>
+      'Share links from these sites to SpotiFLAC Mobile and this extension will handle them.';
+
+  @override
+  String extensionSettingsCount(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'settings',
+      one: 'setting',
+    );
+    return '$count $_temp0';
+  }
+
+  @override
+  String get extensionHealthOnline => 'Online';
+
+  @override
+  String get extensionHealthDegraded => 'Degraded';
+
+  @override
+  String get extensionHealthOffline => 'Offline';
+
+  @override
+  String get extensionHealthNotConfigured => 'Not configured';
+
+  @override
+  String get extensionHealthUnknown => 'Unknown';
+
+  @override
+  String get extensionHealthRequired => 'required';
+
+  @override
+  String get extensionSettingNotSet => 'Not set';
+
+  @override
+  String get extensionActionFailed => 'Action failed';
+
+  @override
+  String get extensionEnterValue => 'Enter value';
+
+  @override
+  String get extensionHealthServiceOnline => 'Service online';
+
+  @override
+  String get extensionHealthServiceDegraded => 'Service degraded';
+
+  @override
+  String get extensionHealthServiceOffline => 'Service offline';
+
+  @override
+  String get extensionHealthServiceUnknown => 'Service status unknown';
+
+  @override
+  String get audioAnalysisStereo => 'Stereo';
+
+  @override
+  String get audioAnalysisMono => 'Mono';
+
+  @override
+  String trackOpenInService(String serviceName) {
+    return 'Open in $serviceName';
+  }
+
+  @override
+  String get trackLyricsEmbeddedSource => 'Embedded';
+
+  @override
+  String get unknownAlbum => 'Unknown Album';
+
+  @override
+  String get unknownArtist => 'Unknown Artist';
+
+  @override
+  String get permissionAudio => 'Audio';
+
+  @override
+  String get permissionStorage => 'Storage';
+
+  @override
+  String get permissionNotification => 'Notification';
+
+  @override
+  String get errorInvalidFolderSelected => 'Invalid folder selected';
+
+  @override
+  String get errorCouldNotKeepFolderAccess =>
+      'Could not keep access to the selected folder';
+
+  @override
+  String get storeAnyVersion => 'Any';
+
+  @override
+  String get storeCategoryMetadata => 'Metadata';
+
+  @override
+  String get storeCategoryDownload => 'Download';
+
+  @override
+  String get storeCategoryUtility => 'Utility';
+
+  @override
+  String get storeCategoryLyrics => 'Lyrics';
+
+  @override
+  String get storeCategoryIntegration => 'Integration';
+
+  @override
+  String get artistReleases => 'Releases';
 }
 
 /// The translations for Chinese, as used in China (`zh_CN`).
@@ -4176,7 +4565,7 @@ class AppLocalizationsZhCn extends AppLocalizationsZh {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -7008,6 +7397,12 @@ class AppLocalizationsZhCn extends AppLocalizationsZh {
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';
@@ -7651,7 +8046,7 @@ class AppLocalizationsZhTw extends AppLocalizationsZh {
 
   @override
   String get aboutAppDescription =>
-      'Download Spotify tracks in lossless quality from Tidal and Qobuz.';
+      'Search music metadata, manage extensions, and organize your library.';
 
   @override
   String get artistAlbums => 'Albums';
@@ -10485,6 +10880,12 @@ class AppLocalizationsZhTw extends AppLocalizationsZh {
   @override
   String get audioAnalysisSamples => 'Samples';
 
+  @override
+  String get audioAnalysisRescan => 'Re-analyze';
+
+  @override
+  String get audioAnalysisRescanning => 'Re-analyzing audio...';
+
   @override
   String extensionsSearchWith(String providerName) {
     return 'Search with $providerName';

lib/l10n/arb/app_de.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Lade Spotify-Titel in verlustfreier Qualität von Tidal und Qobuz herunter.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_en.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -1587,6 +1587,15 @@
   "@trackCopyLyrics": {
     "description": "Action - copy lyrics to clipboard"
   },
+  "trackLyricsSource": "Source: {source}",
+  "@trackLyricsSource": {
+    "description": "Label showing the lyrics source/provider",
+    "placeholders": {
+      "source": {
+        "type": "String"
+      }
+    }
+  },
   "trackLyricsNotAvailable": "Lyrics not available for this track",
   "@trackLyricsNotAvailable": {
     "description": "Message when lyrics not found"
@@ -2001,6 +2010,14 @@
   "@downloadLossyMp3Subtitle": {
     "description": "Subtitle for MP3 320kbps Tidal lossy option"
   },
+  "downloadLossyAac": "AAC/M4A 320kbps",
+  "@downloadLossyAac": {
+    "description": "Tidal lossy format option - AAC in M4A container at 320kbps"
+  },
+  "downloadLossyAacSubtitle": "Best mobile compatibility, M4A container",
+  "@downloadLossyAacSubtitle": {
+    "description": "Subtitle for AAC/M4A 320kbps Tidal lossy option"
+  },
   "downloadLossyOpus256": "Opus 256kbps",
   "@downloadLossyOpus256": {
     "description": "Tidal lossy format option - Opus 256kbps"
@@ -3170,7 +3187,7 @@
   "@trackConvertFormat": {
     "description": "Menu item - convert audio format"
   },
-  "trackConvertFormatSubtitle": "Convert to MP3, Opus, ALAC, or FLAC",
+  "trackConvertFormatSubtitle": "Convert to AAC/M4A, MP3, Opus, ALAC, or FLAC",
   "@trackConvertFormatSubtitle": {
     "description": "Subtitle for convert format menu item"
   },
@@ -3969,6 +3986,18 @@
   "@downloadAppleQqMultiPersonDisabled": {
     "description": "Subtitle when multi-person lyrics is off"
   },
+  "downloadAppleElrcWordSync": "Apple Music eLRC Word Sync",
+  "@downloadAppleElrcWordSync": {
+    "description": "Setting for preserving Apple Music word-by-word eLRC timestamps"
+  },
+  "downloadAppleElrcWordSyncEnabled": "Raw word-by-word timestamps preserved",
+  "@downloadAppleElrcWordSyncEnabled": {
+    "description": "Subtitle when Apple Music eLRC word sync is enabled"
+  },
+  "downloadAppleElrcWordSyncDisabled": "Safer line-by-line Apple Music lyrics",
+  "@downloadAppleElrcWordSyncDisabled": {
+    "description": "Subtitle when Apple Music eLRC word sync is disabled"
+  },
   "downloadMusixmatchLanguage": "Musixmatch Language",
   "@downloadMusixmatchLanguage": {
     "description": "Setting for Musixmatch lyrics translation language"
@@ -4243,6 +4272,18 @@
   "@audioAnalysisSampleRate": {
     "description": "Sample rate metric label"
   },
+  "audioAnalysisCodec": "Codec",
+  "@audioAnalysisCodec": {
+    "description": "Audio codec metric label"
+  },
+  "audioAnalysisContainer": "Container",
+  "@audioAnalysisContainer": {
+    "description": "Audio container metric label"
+  },
+  "audioAnalysisDecodedFormat": "Decoded Format",
+  "@audioAnalysisDecodedFormat": {
+    "description": "Decoded sample format metric label"
+  },
   "audioAnalysisBitDepth": "Bit Depth",
   "@audioAnalysisBitDepth": {
     "description": "Bit depth metric label"
@@ -4275,10 +4316,42 @@
   "@audioAnalysisRms": {
     "description": "RMS level metric label"
   },
+  "audioAnalysisLufs": "LUFS",
+  "@audioAnalysisLufs": {
+    "description": "Integrated loudness metric label"
+  },
+  "audioAnalysisTruePeak": "True Peak",
+  "@audioAnalysisTruePeak": {
+    "description": "True peak metric label"
+  },
+  "audioAnalysisClipping": "Clipping",
+  "@audioAnalysisClipping": {
+    "description": "Clipping metric label"
+  },
+  "audioAnalysisNoClipping": "No clipping",
+  "@audioAnalysisNoClipping": {
+    "description": "Displayed when no clipped samples were detected"
+  },
+  "audioAnalysisSpectralCutoff": "Spectral Cutoff",
+  "@audioAnalysisSpectralCutoff": {
+    "description": "Estimated spectral cutoff metric label"
+  },
+  "audioAnalysisChannelStats": "Per-channel Stats",
+  "@audioAnalysisChannelStats": {
+    "description": "Per-channel audio analysis section label"
+  },
   "audioAnalysisSamples": "Samples",
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",
@@ -5001,5 +5074,417 @@
   "downloadFallbackExtensionsSubtitle": "Choose which extensions can be used as fallback",
   "@downloadFallbackExtensionsSubtitle": {
     "description": "Subtitle for fallback extensions item"
+  },
+  "editMetadataFieldDateHint": "YYYY-MM-DD or YYYY",
+  "@editMetadataFieldDateHint": {
+    "description": "Hint text for the edit metadata date field"
+  },
+  "editMetadataFieldTrackTotal": "Track Total",
+  "@editMetadataFieldTrackTotal": {
+    "description": "Label for total tracks field in the edit metadata sheet"
+  },
+  "editMetadataFieldDiscTotal": "Disc Total",
+  "@editMetadataFieldDiscTotal": {
+    "description": "Label for total discs field in the edit metadata sheet"
+  },
+  "editMetadataFieldComposer": "Composer",
+  "@editMetadataFieldComposer": {
+    "description": "Label for composer field in the edit metadata sheet"
+  },
+  "editMetadataFieldComment": "Comment",
+  "@editMetadataFieldComment": {
+    "description": "Label for comment field in the edit metadata sheet"
+  },
+  "editMetadataAdvanced": "Advanced",
+  "@editMetadataAdvanced": {
+    "description": "Expandable section label for advanced metadata fields"
+  },
+  "libraryFilterMetadataMissingTrackNumber": "Missing track number",
+  "@libraryFilterMetadataMissingTrackNumber": {
+    "description": "Filter option - items missing track number"
+  },
+  "libraryFilterMetadataMissingDiscNumber": "Missing disc number",
+  "@libraryFilterMetadataMissingDiscNumber": {
+    "description": "Filter option - items missing disc number"
+  },
+  "libraryFilterMetadataMissingArtist": "Missing artist",
+  "@libraryFilterMetadataMissingArtist": {
+    "description": "Filter option - items missing artist"
+  },
+  "libraryFilterMetadataIncorrectIsrcFormat": "Incorrect ISRC format",
+  "@libraryFilterMetadataIncorrectIsrcFormat": {
+    "description": "Filter option - items with an invalid ISRC format"
+  },
+  "libraryFilterMetadataMissingLabel": "Missing label",
+  "@libraryFilterMetadataMissingLabel": {
+    "description": "Filter option - items missing record label"
+  },
+  "collectionDeletePlaylistsMessage": "Delete {count} {count, plural, =1{playlist} other{playlists}}?",
+  "@collectionDeletePlaylistsMessage": {
+    "description": "Confirmation message for deleting selected playlists",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "collectionPlaylistsDeleted": "{count} {count, plural, =1{playlist} other{playlists}} deleted",
+  "@collectionPlaylistsDeleted": {
+    "description": "Snackbar after deleting selected playlists",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "collectionAddedTracksToPlaylist": "Added {count} {count, plural, =1{track} other{tracks}} to {playlistName}",
+  "@collectionAddedTracksToPlaylist": {
+    "description": "Snackbar after adding multiple tracks to a playlist",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      },
+      "playlistName": {
+        "type": "String"
+      }
+    }
+  },
+  "collectionAddedTracksToPlaylistWithExisting": "Added {count} {count, plural, =1{track} other{tracks}} to {playlistName} ({alreadyCount} already in playlist)",
+  "@collectionAddedTracksToPlaylistWithExisting": {
+    "description": "Snackbar after adding multiple tracks to a playlist when some were already present",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      },
+      "playlistName": {
+        "type": "String"
+      },
+      "alreadyCount": {
+        "type": "int"
+      }
+    }
+  },
+  "itemCount": "{count} {count, plural, =1{item} other{items}}",
+  "@itemCount": {
+    "description": "Generic item count label",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "trackReEnrichSuccessWithFailures": "Metadata re-enriched successfully ({successCount}/{total}) - Failed: {failedCount}",
+  "@trackReEnrichSuccessWithFailures": {
+    "description": "Snackbar summary after batch metadata re-enrichment finishes with failures",
+    "placeholders": {
+      "successCount": {
+        "type": "int"
+      },
+      "total": {
+        "type": "int"
+      },
+      "failedCount": {
+        "type": "int"
+      }
+    }
+  },
+  "selectionDeleteTracksCount": "Delete {count} {count, plural, =1{track} other{tracks}}",
+  "@selectionDeleteTracksCount": {
+    "description": "Button label for deleting selected tracks",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "queueDownloadSpeedStatus": "Downloading - {speed} MB/s",
+  "@queueDownloadSpeedStatus": {
+    "description": "Queue status while downloading with speed",
+    "placeholders": {
+      "speed": {
+        "type": "String"
+      }
+    }
+  },
+  "queueDownloadStarting": "Starting...",
+  "@queueDownloadStarting": {
+    "description": "Queue status before download progress is available"
+  },
+  "a11ySelectTrack": "Select track",
+  "@a11ySelectTrack": {
+    "description": "Accessibility label for selecting a track"
+  },
+  "a11yDeselectTrack": "Deselect track",
+  "@a11yDeselectTrack": {
+    "description": "Accessibility label for deselecting a track"
+  },
+  "a11yPlayTrackByArtist": "Play {trackName} by {artistName}",
+  "@a11yPlayTrackByArtist": {
+    "description": "Accessibility label for playing a local library track",
+    "placeholders": {
+      "trackName": {
+        "type": "String"
+      },
+      "artistName": {
+        "type": "String"
+      }
+    }
+  },
+  "storeExtensionsCount": "{count} {count, plural, =1{extension} other{extensions}}",
+  "@storeExtensionsCount": {
+    "description": "Store extension result count",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "storeRequiresVersion": "Requires v{version}+",
+  "@storeRequiresVersion": {
+    "description": "Store compatibility badge for minimum app version",
+    "placeholders": {
+      "version": {
+        "type": "String"
+      }
+    }
+  },
+  "actionGo": "Go",
+  "@actionGo": {
+    "description": "Generic action button label"
+  },
+  "logIssueSummary": "Issue Summary",
+  "@logIssueSummary": {
+    "description": "Header for log issue analysis summary"
+  },
+  "logTotalErrors": "Total errors: {count}",
+  "@logTotalErrors": {
+    "description": "Total error count in log issue analysis",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "logAffectedDomains": "Affected: {domains}",
+  "@logAffectedDomains": {
+    "description": "Affected domains in log issue analysis",
+    "placeholders": {
+      "domains": {
+        "type": "String"
+      }
+    }
+  },
+  "libraryScanCancelled": "Scan cancelled",
+  "@libraryScanCancelled": {
+    "description": "Library scan status when a scan was cancelled"
+  },
+  "libraryScanCancelledSubtitle": "You can retry the scan when ready.",
+  "@libraryScanCancelledSubtitle": {
+    "description": "Library scan status subtitle after cancellation"
+  },
+  "libraryDownloadsHistoryExcluded": "{count} from Downloads history (excluded from list)",
+  "@libraryDownloadsHistoryExcluded": {
+    "description": "Library count note for downloaded history items excluded from the local list",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "downloadNativeWorker": "Native download worker",
+  "@downloadNativeWorker": {
+    "description": "Setting title for Android native download worker"
+  },
+  "downloadNativeWorkerSubtitle": "Beta Android service worker for extension downloads",
+  "@downloadNativeWorkerSubtitle": {
+    "description": "Setting subtitle for Android native download worker"
+  },
+  "badgeBeta": "BETA",
+  "@badgeBeta": {
+    "description": "Badge label for beta features"
+  },
+  "extensionServiceStatus": "Service Status",
+  "@extensionServiceStatus": {
+    "description": "Extension detail section header for service status"
+  },
+  "extensionServiceHealth": "Service health",
+  "@extensionServiceHealth": {
+    "description": "Extension capability label for service health checks"
+  },
+  "extensionHealthChecksConfigured": "{count} {count, plural, =1{check} other{checks}} configured",
+  "@extensionHealthChecksConfigured": {
+    "description": "Extension service health check count",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "extensionOauthConnectHint": "Tap Connect to Spotify to fill this field.",
+  "@extensionOauthConnectHint": {
+    "description": "Hint for an OAuth login link field before connecting Spotify"
+  },
+  "extensionLastChecked": "Last checked {time}",
+  "@extensionLastChecked": {
+    "description": "Timestamp for the latest extension service health check",
+    "placeholders": {
+      "time": {
+        "type": "String"
+      }
+    }
+  },
+  "extensionRefreshStatus": "Refresh status",
+  "@extensionRefreshStatus": {
+    "description": "Tooltip for refreshing extension service health status"
+  },
+  "extensionCustomUrlHandling": "Custom URL Handling",
+  "@extensionCustomUrlHandling": {
+    "description": "Extension detail section title for custom URL handling"
+  },
+  "extensionCustomUrlHandlingSubtitle": "This extension can handle links from these sites",
+  "@extensionCustomUrlHandlingSubtitle": {
+    "description": "Extension detail subtitle for custom URL handling"
+  },
+  "extensionCustomUrlHandlingShareHint": "Share links from these sites to SpotiFLAC Mobile and this extension will handle them.",
+  "@extensionCustomUrlHandlingShareHint": {
+    "description": "Extension detail hint explaining share-to-app URL handling"
+  },
+  "extensionSettingsCount": "{count} {count, plural, =1{setting} other{settings}}",
+  "@extensionSettingsCount": {
+    "description": "Count of settings exposed by an extension quality option",
+    "placeholders": {
+      "count": {
+        "type": "int"
+      }
+    }
+  },
+  "extensionHealthOnline": "Online",
+  "@extensionHealthOnline": {
+    "description": "Extension service health status - online"
+  },
+  "extensionHealthDegraded": "Degraded",
+  "@extensionHealthDegraded": {
+    "description": "Extension service health status - degraded"
+  },
+  "extensionHealthOffline": "Offline",
+  "@extensionHealthOffline": {
+    "description": "Extension service health status - offline"
+  },
+  "extensionHealthNotConfigured": "Not configured",
+  "@extensionHealthNotConfigured": {
+    "description": "Extension service health status - not configured"
+  },
+  "extensionHealthUnknown": "Unknown",
+  "@extensionHealthUnknown": {
+    "description": "Extension service health status - unknown"
+  },
+  "extensionHealthRequired": "required",
+  "@extensionHealthRequired": {
+    "description": "Label for a required extension service health check"
+  },
+  "extensionSettingNotSet": "Not set",
+  "@extensionSettingNotSet": {
+    "description": "Value shown when an extension setting has no value"
+  },
+  "extensionActionFailed": "Action failed",
+  "@extensionActionFailed": {
+    "description": "Fallback error when an extension action fails without details"
+  },
+  "extensionEnterValue": "Enter value",
+  "@extensionEnterValue": {
+    "description": "Hint for editing an extension setting value"
+  },
+  "extensionHealthServiceOnline": "Service online",
+  "@extensionHealthServiceOnline": {
+    "description": "Tooltip for online extension service"
+  },
+  "extensionHealthServiceDegraded": "Service degraded",
+  "@extensionHealthServiceDegraded": {
+    "description": "Tooltip for degraded extension service"
+  },
+  "extensionHealthServiceOffline": "Service offline",
+  "@extensionHealthServiceOffline": {
+    "description": "Tooltip for offline extension service"
+  },
+  "extensionHealthServiceUnknown": "Service status unknown",
+  "@extensionHealthServiceUnknown": {
+    "description": "Tooltip for unknown extension service health"
+  },
+  "audioAnalysisStereo": "Stereo",
+  "@audioAnalysisStereo": {
+    "description": "Audio channel layout label - stereo"
+  },
+  "audioAnalysisMono": "Mono",
+  "@audioAnalysisMono": {
+    "description": "Audio channel layout label - mono"
+  },
+  "trackOpenInService": "Open in {serviceName}",
+  "@trackOpenInService": {
+    "description": "Button label to open a track in a named music service",
+    "placeholders": {
+      "serviceName": {
+        "type": "String"
+      }
+    }
+  },
+  "trackLyricsEmbeddedSource": "Embedded",
+  "@trackLyricsEmbeddedSource": {
+    "description": "Lyrics source label for embedded lyrics"
+  },
+  "unknownAlbum": "Unknown Album",
+  "@unknownAlbum": {
+    "description": "Fallback album name when metadata is missing"
+  },
+  "unknownArtist": "Unknown Artist",
+  "@unknownArtist": {
+    "description": "Fallback artist name when metadata is missing"
+  },
+  "permissionAudio": "Audio",
+  "@permissionAudio": {
+    "description": "Audio permission type label"
+  },
+  "permissionStorage": "Storage",
+  "@permissionStorage": {
+    "description": "Storage permission type label"
+  },
+  "permissionNotification": "Notification",
+  "@permissionNotification": {
+    "description": "Notification permission type label"
+  },
+  "errorInvalidFolderSelected": "Invalid folder selected",
+  "@errorInvalidFolderSelected": {
+    "description": "Error when the selected folder is invalid"
+  },
+  "errorCouldNotKeepFolderAccess": "Could not keep access to the selected folder",
+  "@errorCouldNotKeepFolderAccess": {
+    "description": "Error when persistent folder access cannot be saved"
+  },
+  "storeAnyVersion": "Any",
+  "@storeAnyVersion": {
+    "description": "Store detail value when any app version is accepted"
+  },
+  "storeCategoryMetadata": "Metadata",
+  "@storeCategoryMetadata": {
+    "description": "Store extension category - metadata"
+  },
+  "storeCategoryDownload": "Download",
+  "@storeCategoryDownload": {
+    "description": "Store extension category - download"
+  },
+  "storeCategoryUtility": "Utility",
+  "@storeCategoryUtility": {
+    "description": "Store extension category - utility"
+  },
+  "storeCategoryLyrics": "Lyrics",
+  "@storeCategoryLyrics": {
+    "description": "Store extension category - lyrics"
+  },
+  "storeCategoryIntegration": "Integration",
+  "@storeCategoryIntegration": {
+    "description": "Store extension category - integration"
+  },
+  "artistReleases": "Releases",
+  "@artistReleases": {
+    "description": "Section header for all artist releases"
   }
 }

lib/l10n/arb/app_es.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_es_ES.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Descargar pistas de Spotify en alta calidad (sin pérdida) de Tidal y Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_fr.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_hi.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_id.arb

@@ -458,7 +458,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Unduh lagu-lagu Spotify dalam kualitas lossless dari Tidal dan Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4204,6 +4204,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_ja.arb

@@ -438,7 +438,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_ko.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_nl.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_pt.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_pt_PT.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_ru.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Скачивайте треки Spotify в lossless качестве с Tidal и Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_tr.arb

@@ -438,7 +438,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Spotify parçalarını Tidal ve Qobuz aracılığıyla kayıpsız kalitede indirin.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4027,6 +4027,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "downloadSingleFilenameFormat": "Single Dosya Adı Formatı",
   "@downloadSingleFilenameFormat": {
     "description": "Setting for output filename pattern for singles/EPs"

lib/l10n/arb/app_uk.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Кінцеві точки потокового передавання Tidal Hi-Res FLAC. Ключовий елемент пазлу музики без втрат.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Пошук за допомогою{providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_zh.arb

@@ -398,7 +398,7 @@
   "@aboutSachinsenalDesc": {
     "description": "Credit description for sachinsenal0x64"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_zh_CN.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/l10n/arb/app_zh_TW.arb

@@ -498,7 +498,7 @@
   "@aboutSjdonadoDesc": {
     "description": "Credit description for sjdonado"
   },
-  "aboutAppDescription": "Download Spotify tracks in lossless quality from Tidal and Qobuz.",
+  "aboutAppDescription": "Search music metadata, manage extensions, and organize your library.",
   "@aboutAppDescription": {
     "description": "App description in header card"
   },
@@ -4196,6 +4196,14 @@
   "@audioAnalysisSamples": {
     "description": "Total samples metric label"
   },
+  "audioAnalysisRescan": "Re-analyze",
+  "@audioAnalysisRescan": {
+    "description": "Tooltip/label for the button that re-runs the audio analysis, discarding cached results"
+  },
+  "audioAnalysisRescanning": "Re-analyzing audio...", 
+  "@audioAnalysisRescanning": {
+    "description": "Loading text while audio is being re-analyzed after an explicit refresh"
+  },
   "extensionsSearchWith": "Search with {providerName}",
   "@extensionsSearchWith": {
     "description": "Extensions page - subtitle for built-in search provider option",

lib/models/settings.dart

@@ -47,7 +47,7 @@ class AppSettings {
   final String locale;
   final String lyricsMode;
   final String
-  tidalHighFormat; // Format for Tidal HIGH quality: 'mp3_320', 'opus_256', or 'opus_128'
+  tidalHighFormat; // Format for Tidal HIGH quality: 'mp3_320', 'aac_320', 'opus_256', or 'opus_128'
   final bool
   useAllFilesAccess; // Android 13+ only: enable MANAGE_EXTERNAL_STORAGE
   final bool
@@ -81,6 +81,8 @@ class AppSettings {
   lyricsIncludeRomanizationNetease; // Append romanized lyrics (Netease)
   final bool
   lyricsMultiPersonWordByWord; // Enable v1/v2 + [bg:] tags for Apple/QQ syllable lyrics
+  final bool
+  lyricsAppleElrcWordSync; // Preserve Apple Music inline word timestamps for eLRC-capable players
   final String
   musixmatchLanguage; // Optional ISO language code for Musixmatch localized lyrics
 
@@ -146,6 +148,7 @@ class AppSettings {
     this.lyricsIncludeTranslationNetease = false,
     this.lyricsIncludeRomanizationNetease = false,
     this.lyricsMultiPersonWordByWord = false,
+    this.lyricsAppleElrcWordSync = false,
     this.musixmatchLanguage = '',
     this.lastSeenVersion = '',
     this.deduplicateDownloads = true,
@@ -210,6 +213,7 @@ class AppSettings {
     bool? lyricsIncludeTranslationNetease,
     bool? lyricsIncludeRomanizationNetease,
     bool? lyricsMultiPersonWordByWord,
+    bool? lyricsAppleElrcWordSync,
     String? musixmatchLanguage,
     String? lastSeenVersion,
     bool? deduplicateDownloads,
@@ -291,6 +295,8 @@ class AppSettings {
           this.lyricsIncludeRomanizationNetease,
       lyricsMultiPersonWordByWord:
           lyricsMultiPersonWordByWord ?? this.lyricsMultiPersonWordByWord,
+      lyricsAppleElrcWordSync:
+          lyricsAppleElrcWordSync ?? this.lyricsAppleElrcWordSync,
       musixmatchLanguage: musixmatchLanguage ?? this.musixmatchLanguage,
       lastSeenVersion: lastSeenVersion ?? this.lastSeenVersion,
       deduplicateDownloads: deduplicateDownloads ?? this.deduplicateDownloads,

lib/models/settings.g.dart

@@ -78,6 +78,7 @@ AppSettings _$AppSettingsFromJson(Map<String, dynamic> json) => AppSettings(
       json['lyricsIncludeRomanizationNetease'] as bool? ?? false,
   lyricsMultiPersonWordByWord:
       json['lyricsMultiPersonWordByWord'] as bool? ?? false,
+  lyricsAppleElrcWordSync: json['lyricsAppleElrcWordSync'] as bool? ?? false,
   musixmatchLanguage: json['musixmatchLanguage'] as String? ?? '',
   lastSeenVersion: json['lastSeenVersion'] as String? ?? '',
   deduplicateDownloads: json['deduplicateDownloads'] as bool? ?? true,
@@ -142,6 +143,7 @@ Map<String, dynamic> _$AppSettingsToJson(
   'lyricsIncludeTranslationNetease': instance.lyricsIncludeTranslationNetease,
   'lyricsIncludeRomanizationNetease': instance.lyricsIncludeRomanizationNetease,
   'lyricsMultiPersonWordByWord': instance.lyricsMultiPersonWordByWord,
+  'lyricsAppleElrcWordSync': instance.lyricsAppleElrcWordSync,
   'musixmatchLanguage': instance.musixmatchLanguage,
   'lastSeenVersion': instance.lastSeenVersion,
   'deduplicateDownloads': instance.deduplicateDownloads,

lib/models/theme_settings.dart

@@ -46,7 +46,7 @@ class ThemeSettings {
 
   factory ThemeSettings.fromJson(Map<String, dynamic> json) {
     return ThemeSettings(
-      themeMode: _themeModeFromString(json[kThemeModeKey] as String?),
+      themeMode: themeModeFromString(json[kThemeModeKey] as String?),
       useDynamicColor: json[kUseDynamicColorKey] as bool? ?? true,
       seedColorValue: json[kSeedColorKey] as int? ?? kDefaultSeedColor,
       useAmoled: json[kUseAmoledKey] as bool? ?? false,
@@ -68,7 +68,7 @@ class ThemeSettings {
       themeMode.hashCode ^ useDynamicColor.hashCode ^ seedColorValue.hashCode ^ useAmoled.hashCode;
 }
 
-ThemeMode _themeModeFromString(String? value) {
+ThemeMode themeModeFromString(String? value) {
   if (value == null) return ThemeMode.system;
   return ThemeMode.values.firstWhere(
     (e) => e.name == value,

lib/providers/local_library_provider.dart

@@ -54,11 +54,6 @@ class LocalLibraryState {
        _isrcSet = isrcSet ?? const <String>{},
        _filePathById = filePathById ?? const <String, String>{};
 
-  @Deprecated(
-    'LocalLibraryState no longer owns full track rows. Use DB-backed page providers.',
-  )
-  List<LocalLibraryItem> get items => const <LocalLibraryItem>[];
-
   bool hasIsrc(String isrc) => _isrcSet.contains(isrc);
 
   bool hasTrack(String trackName, String artistName) {

lib/providers/settings_provider.dart

@@ -108,6 +108,7 @@ class SettingsNotifier extends Notifier<AppSettings> {
       'include_translation_netease': state.lyricsIncludeTranslationNetease,
       'include_romanization_netease': state.lyricsIncludeRomanizationNetease,
       'multi_person_word_by_word': state.lyricsMultiPersonWordByWord,
+      'apple_elrc_word_sync': state.lyricsAppleElrcWordSync,
       'musixmatch_language': state.musixmatchLanguage,
     }).catchError((Object e) {
       _log.w('Failed to sync lyrics fetch options to backend: $e');
@@ -367,6 +368,12 @@ class SettingsNotifier extends Notifier<AppSettings> {
     _syncLyricsSettingsToBackend();
   }
 
+  void setLyricsAppleElrcWordSync(bool enabled) {
+    state = state.copyWith(lyricsAppleElrcWordSync: enabled);
+    _saveSettings();
+    _syncLyricsSettingsToBackend();
+  }
+
   void setMusixmatchLanguage(String languageCode) {
     state = state.copyWith(
       musixmatchLanguage: languageCode.trim().toLowerCase(),

lib/providers/theme_provider.dart

@@ -25,7 +25,7 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
       final useAmoled = prefs.getBool(kUseAmoledKey);
 
       state = ThemeSettings(
-        themeMode: _themeModeFromString(modeString),
+        themeMode: themeModeFromString(modeString),
         useDynamicColor: useDynamic ?? true,
         seedColorValue: seedColor ?? kDefaultSeedColor,
         useAmoled: useAmoled ?? false,
@@ -71,12 +71,4 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     state = state.copyWith(useAmoled: value);
     await _saveToStorage();
   }
-
-  ThemeMode _themeModeFromString(String? value) {
-    if (value == null) return ThemeMode.system;
-    return ThemeMode.values.firstWhere(
-      (e) => e.name == value,
-      orElse: () => ThemeMode.system,
-    );
-  }
 }

lib/screens/artist_screen.dart

@@ -507,7 +507,7 @@ class _ArtistScreenState extends ConsumerState<ArtistScreen> {
                   if (releases.isNotEmpty)
                     SliverToBoxAdapter(
                       child: _buildAlbumSection(
-                        'Releases',
+                        context.l10n.artistReleases,
                         releases,
                         colorScheme,
                       ),

lib/screens/downloaded_album_screen.dart

@@ -10,6 +10,7 @@ import 'package:spotiflac_android/services/ffmpeg_service.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/services/history_database.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/utils/audio_conversion_utils.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
 import 'package:spotiflac_android/utils/image_cache_utils.dart';
 import 'package:spotiflac_android/utils/lyrics_metadata_helper.dart';
@@ -944,40 +945,39 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     for (final id in _selectedIds) {
       final item = tracksById[id];
       if (item == null) continue;
-      final nameToCheck =
-          (item.safFileName != null && item.safFileName!.isNotEmpty)
-          ? item.safFileName!.toLowerCase()
-          : item.filePath.toLowerCase();
-      final ext = nameToCheck.endsWith('.flac')
-          ? 'FLAC'
-          : nameToCheck.endsWith('.m4a')
-          ? 'M4A'
-          : nameToCheck.endsWith('.mp3')
-          ? 'MP3'
-          : (nameToCheck.endsWith('.opus') || nameToCheck.endsWith('.ogg'))
-          ? 'Opus'
-          : null;
-      if (ext != null) sourceFormats.add(ext);
+      final sourceFormat = convertibleAudioSourceFormat(
+        storedFormat: item.format,
+        filePath: item.filePath,
+        fileName: item.safFileName,
+      );
+      if (sourceFormat != null) sourceFormats.add(sourceFormat);
     }
 
-    final formats = ['ALAC', 'FLAC', 'MP3', 'Opus'].where((target) {
-      return sourceFormats.any((src) {
-        if (src == target) return false;
-        final isLosslessTarget = target == 'ALAC' || target == 'FLAC';
-        final isLosslessSource = src == 'FLAC' || src == 'M4A';
-        if (isLosslessTarget && !isLosslessSource) return false;
-        return true;
-      });
-    }).toList();
+    final formats = audioConversionTargetFormats
+        .where(
+          (target) => sourceFormats.any(
+            (source) => canConvertAudioFormat(
+              sourceFormat: source,
+              targetFormat: target,
+            ),
+          ),
+        )
+        .toList();
 
     if (formats.isEmpty) return;
 
     String selectedFormat = formats.first;
     bool isLosslessTarget =
         selectedFormat == 'ALAC' || selectedFormat == 'FLAC';
+    String defaultBitrateForFormat(String format) {
+      if (format == 'Opus') return '128k';
+      if (format == 'AAC') return '256k';
+      return '320k';
+    }
+
     String selectedBitrate = isLosslessTarget
         ? '320k'
-        : (selectedFormat == 'Opus' ? '128k' : '320k');
+        : defaultBitrateForFormat(selectedFormat);
 
     showModalBottomSheet<void>(
       context: context,
@@ -1039,9 +1039,9 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
                                 isLosslessTarget =
                                     format == 'ALAC' || format == 'FLAC';
                                 if (!isLosslessTarget) {
-                                  selectedBitrate = format == 'Opus'
-                                      ? '128k'
-                                      : '320k';
+                                  selectedBitrate = defaultBitrateForFormat(
+                                    format,
+                                  );
                                 }
                               });
                             }
@@ -1137,23 +1137,18 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
     for (final id in _selectedIds) {
       final item = tracksById[id];
       if (item == null) continue;
-      final nameToCheck =
-          (item.safFileName != null && item.safFileName!.isNotEmpty)
-          ? item.safFileName!.toLowerCase()
-          : item.filePath.toLowerCase();
-      final ext = nameToCheck.endsWith('.flac')
-          ? 'FLAC'
-          : nameToCheck.endsWith('.m4a')
-          ? 'M4A'
-          : nameToCheck.endsWith('.mp3')
-          ? 'MP3'
-          : (nameToCheck.endsWith('.opus') || nameToCheck.endsWith('.ogg'))
-          ? 'Opus'
-          : null;
-      if (ext == null || ext == targetFormat) continue;
-      final isLosslessTarget = targetFormat == 'ALAC' || targetFormat == 'FLAC';
-      final isLosslessSource = ext == 'FLAC' || ext == 'M4A';
-      if (isLosslessTarget && !isLosslessSource) continue;
+      final sourceFormat = convertibleAudioSourceFormat(
+        storedFormat: item.format,
+        filePath: item.filePath,
+        fileName: item.safFileName,
+      );
+      if (sourceFormat == null ||
+          !canConvertAudioFormat(
+            sourceFormat: sourceFormat,
+            targetFormat: targetFormat,
+          )) {
+        continue;
+      }
       selected.add(item);
     }
 
@@ -1316,6 +1311,7 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
                 mimeType = 'audio/opus';
                 break;
               case 'alac':
+              case 'aac':
                 newExt = '.m4a';
                 mimeType = 'audio/mp4';
                 break;
@@ -1350,14 +1346,21 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
               continue;
             }
 
-            try {
-              await PlatformBridge.safDelete(item.filePath);
-            } catch (_) {}
+            if (!isSameContentUri(item.filePath, safUri)) {
+              try {
+                await PlatformBridge.safDelete(item.filePath);
+              } catch (_) {}
+            }
             await historyDb.updateFilePath(
               item.id,
               safUri,
               newSafFileName: newFileName,
               newQuality: newQuality,
+              newFormat: normalizedConvertedAudioFormat(targetFormat),
+              newBitrate: convertedAudioBitrateKbps(
+                targetFormat: targetFormat,
+                bitrate: bitrate,
+              ),
               clearAudioSpecs: true,
             );
           }
@@ -1374,6 +1377,11 @@ class _DownloadedAlbumScreenState extends ConsumerState<DownloadedAlbumScreen> {
             item.id,
             newPath,
             newQuality: newQuality,
+            newFormat: normalizedConvertedAudioFormat(targetFormat),
+            newBitrate: convertedAudioBitrateKbps(
+              targetFormat: targetFormat,
+              bitrate: bitrate,
+            ),
             clearAudioSpecs: true,
           );
         }

lib/screens/home_tab.dart

@@ -1549,7 +1549,7 @@ class _HomeTabState extends ConsumerState<HomeTab>
               shape: BoxShape.circle,
             ),
             child: Image.asset(
-              'assets/images/logo-transparant.png',
+              'assets/images/logo-transparent.png',
               color: colorScheme.onPrimary,
               fit: BoxFit.contain,
               errorBuilder: (_, _, _) => ClipRRect(

lib/screens/home_tab_widgets.dart

@@ -508,8 +508,10 @@ class _CollectionItemWidget extends StatelessWidget {
                         item.artistName.isNotEmpty
                             ? item.artistName
                             : (isPlaylist
-                                  ? 'Playlist'
-                                  : (isArtist ? 'Artist' : 'Album')),
+                                  ? context.l10n.recentTypePlaylist
+                                  : (isArtist
+                                        ? context.l10n.recentTypeArtist
+                                        : context.l10n.recentTypeAlbum)),
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: colorScheme.onSurfaceVariant,
                         ),
@@ -607,7 +609,7 @@ class _SearchArtistItemWidget extends StatelessWidget {
                       ),
                       const SizedBox(height: 2),
                       Text(
-                        'Artist',
+                        context.l10n.recentTypeArtist,
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: colorScheme.onSurfaceVariant,
                         ),
@@ -707,7 +709,7 @@ class _SearchAlbumItemWidget extends StatelessWidget {
                       ClickableArtistName(
                         artistName: album.artists.isNotEmpty
                             ? album.artists
-                            : 'Album',
+                            : context.l10n.recentTypeAlbum,
                         coverUrl: album.imageUrl,
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: colorScheme.onSurfaceVariant,
@@ -806,7 +808,9 @@ class _SearchPlaylistItemWidget extends StatelessWidget {
                       ),
                       const SizedBox(height: 2),
                       Text(
-                        playlist.owner.isNotEmpty ? playlist.owner : 'Playlist',
+                        playlist.owner.isNotEmpty
+                            ? playlist.owner
+                            : context.l10n.recentTypePlaylist,
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: colorScheme.onSurfaceVariant,
                         ),

lib/screens/local_album_screen.dart

@@ -8,6 +8,7 @@ import 'package:spotiflac_android/models/track.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
 import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/providers/settings_provider.dart';
+import 'package:spotiflac_android/utils/audio_conversion_utils.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
 import 'package:spotiflac_android/utils/image_cache_utils.dart';
 import 'package:spotiflac_android/utils/lyrics_metadata_helper.dart';
@@ -440,8 +441,8 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
                                     color: Colors.white,
                                   ),
                                   const SizedBox(width: 4),
-                                  const Text(
-                                    'Local',
+                                  Text(
+                                    context.l10n.librarySourceLocal,
                                     style: TextStyle(
                                       color: Colors.white,
                                       fontWeight: FontWeight.w600,
@@ -470,7 +471,9 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
                                   ),
                                   const SizedBox(width: 4),
                                   Text(
-                                    '${_sortedTracksCache.length} tracks',
+                                    context.l10n.queueTrackCount(
+                                      _sortedTracksCache.length,
+                                    ),
                                     style: const TextStyle(
                                       color: Colors.white,
                                       fontWeight: FontWeight.w600,
@@ -1155,7 +1158,11 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     final failedCount = total - successCount;
     final summary = failedCount <= 0
         ? '${context.l10n.trackReEnrichSuccess} ($successCount/$total)'
-        : '${context.l10n.trackReEnrichSuccess} ($successCount/$total) • Failed: $failedCount';
+        : context.l10n.trackReEnrichSuccessWithFailures(
+            successCount,
+            total,
+            failedCount,
+          );
     ScaffoldMessenger.of(
       context,
     ).showSnackBar(SnackBar(content: Text(summary)));
@@ -1170,52 +1177,38 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     for (final id in _selectedIds) {
       final item = tracksById[id];
       if (item == null) continue;
-      String? ext;
-      if (item.format != null && item.format!.isNotEmpty) {
-        final fmt = item.format!.toLowerCase();
-        if (fmt == 'flac') {
-          ext = 'FLAC';
-        } else if (fmt == 'm4a') {
-          ext = 'M4A';
-        } else if (fmt == 'mp3') {
-          ext = 'MP3';
-        } else if (fmt == 'opus' || fmt == 'ogg') {
-          ext = 'Opus';
-        }
-      }
-      if (ext == null) {
-        final lower = item.filePath.toLowerCase();
-        if (lower.endsWith('.flac')) {
-          ext = 'FLAC';
-        } else if (lower.endsWith('.m4a')) {
-          ext = 'M4A';
-        } else if (lower.endsWith('.mp3')) {
-          ext = 'MP3';
-        } else if (lower.endsWith('.opus') || lower.endsWith('.ogg')) {
-          ext = 'Opus';
-        }
-      }
-      if (ext != null) sourceFormats.add(ext);
+      final sourceFormat = convertibleAudioSourceFormat(
+        storedFormat: item.format,
+        filePath: item.filePath,
+      );
+      if (sourceFormat != null) sourceFormats.add(sourceFormat);
     }
 
-    final formats = ['ALAC', 'FLAC', 'MP3', 'Opus'].where((target) {
-      return sourceFormats.any((src) {
-        if (src == target) return false;
-        final isLosslessTarget = target == 'ALAC' || target == 'FLAC';
-        final isLosslessSource = src == 'FLAC' || src == 'M4A';
-        if (isLosslessTarget && !isLosslessSource) return false;
-        return true;
-      });
-    }).toList();
+    final formats = audioConversionTargetFormats
+        .where(
+          (target) => sourceFormats.any(
+            (source) => canConvertAudioFormat(
+              sourceFormat: source,
+              targetFormat: target,
+            ),
+          ),
+        )
+        .toList();
 
     if (formats.isEmpty) return;
 
     String selectedFormat = formats.first;
     bool isLosslessTarget =
         selectedFormat == 'ALAC' || selectedFormat == 'FLAC';
+    String defaultBitrateForFormat(String format) {
+      if (format == 'Opus') return '128k';
+      if (format == 'AAC') return '256k';
+      return '320k';
+    }
+
     String selectedBitrate = isLosslessTarget
         ? '320k'
-        : (selectedFormat == 'Opus' ? '128k' : '320k');
+        : defaultBitrateForFormat(selectedFormat);
 
     showModalBottomSheet<void>(
       context: context,
@@ -1277,9 +1270,9 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
                                 isLosslessTarget =
                                     format == 'ALAC' || format == 'FLAC';
                                 if (!isLosslessTarget) {
-                                  selectedBitrate = format == 'Opus'
-                                      ? '128k'
-                                      : '320k';
+                                  selectedBitrate = defaultBitrateForFormat(
+                                    format,
+                                  );
                                 }
                               });
                             }
@@ -1375,39 +1368,17 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
     for (final id in _selectedIds) {
       final item = tracksById[id];
       if (item == null) continue;
-      // Detect current format: prefer item.format field (works for SAF too),
-      // fall back to file extension for regular paths
-      String? currentFormat;
-      if (item.format != null && item.format!.isNotEmpty) {
-        final fmt = item.format!.toLowerCase();
-        if (fmt == 'flac') {
-          currentFormat = 'FLAC';
-        } else if (fmt == 'm4a') {
-          currentFormat = 'M4A';
-        } else if (fmt == 'mp3') {
-          currentFormat = 'MP3';
-        } else if (fmt == 'opus' || fmt == 'ogg') {
-          currentFormat = 'Opus';
-        }
+      final currentFormat = convertibleAudioSourceFormat(
+        storedFormat: item.format,
+        filePath: item.filePath,
+      );
+      if (currentFormat == null ||
+          !canConvertAudioFormat(
+            sourceFormat: currentFormat,
+            targetFormat: targetFormat,
+          )) {
+        continue;
       }
-      if (currentFormat == null) {
-        // Fallback: try file extension (works for regular paths)
-        final lower = item.filePath.toLowerCase();
-        if (lower.endsWith('.flac')) {
-          currentFormat = 'FLAC';
-        } else if (lower.endsWith('.m4a')) {
-          currentFormat = 'M4A';
-        } else if (lower.endsWith('.mp3')) {
-          currentFormat = 'MP3';
-        } else if (lower.endsWith('.opus') || lower.endsWith('.ogg')) {
-          currentFormat = 'Opus';
-        }
-      }
-      if (currentFormat == null || currentFormat == targetFormat) continue;
-      final isLosslessTarget = targetFormat == 'ALAC' || targetFormat == 'FLAC';
-      final isLosslessSource =
-          currentFormat == 'FLAC' || currentFormat == 'M4A';
-      if (isLosslessTarget && !isLosslessSource) continue;
       selected.add(item);
     }
 
@@ -1602,6 +1573,7 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
                 mimeType = 'audio/opus';
                 break;
               case 'alac':
+              case 'aac':
                 newExt = '.m4a';
                 mimeType = 'audio/mp4';
                 break;
@@ -1636,9 +1608,11 @@ class _LocalAlbumScreenState extends ConsumerState<LocalAlbumScreen> {
               continue;
             }
 
-            try {
-              await PlatformBridge.safDelete(item.filePath);
-            } catch (_) {}
+            if (!isSameContentUri(item.filePath, safUri)) {
+              try {
+                await PlatformBridge.safDelete(item.filePath);
+              } catch (_) {}
+            }
             await localDb.replaceWithConvertedItem(
               item: item,
               newFilePath: safUri,

lib/screens/main_shell.dart

@@ -18,7 +18,9 @@ import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/services/shell_navigation_service.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
+import 'package:spotiflac_android/services/app_remote_config_service.dart';
 import 'package:spotiflac_android/services/update_checker.dart';
+import 'package:spotiflac_android/widgets/app_announcement_dialog.dart';
 import 'package:spotiflac_android/widgets/update_dialog.dart';
 import 'package:spotiflac_android/widgets/animation_utils.dart';
 import 'package:spotiflac_android/utils/logger.dart';
@@ -38,6 +40,7 @@ class _MainShellState extends ConsumerState<MainShell>
   late final PageController _pageController;
   late final AnimationController _tabJumpTransitionController;
   bool _hasCheckedUpdate = false;
+  bool _hasCheckedAppAnnouncement = false;
   StreamSubscription<String>? _shareSubscription;
   DateTime? _lastBackPress;
   final GlobalKey<NavigatorState> _homeTabNavigatorKey =
@@ -66,10 +69,13 @@ class _MainShellState extends ConsumerState<MainShell>
       currentTabIndex: _currentIndex,
       showRepoTab: false,
     );
-    WidgetsBinding.instance.addPostFrameCallback((_) {
-      _checkForUpdates();
+    WidgetsBinding.instance.addPostFrameCallback((_) async {
       _setupShareListener();
       _checkSafMigration();
+      final updateDialogShown = await _checkForUpdates();
+      if (!updateDialogShown) {
+        await _checkAppAnnouncement();
+      }
     });
   }
 
@@ -127,12 +133,12 @@ class _MainShellState extends ConsumerState<MainShell>
     }
   }
 
-  Future<void> _checkForUpdates() async {
-    if (_hasCheckedUpdate) return;
+  Future<bool> _checkForUpdates() async {
+    if (_hasCheckedUpdate) return false;
     _hasCheckedUpdate = true;
 
     final settings = ref.read(settingsProvider);
-    if (!settings.checkForUpdates) return;
+    if (!settings.checkForUpdates) return false;
 
     final updateInfo = await UpdateChecker.checkForUpdate(
       channel: settings.updateChannel,
@@ -145,7 +151,30 @@ class _MainShellState extends ConsumerState<MainShell>
           ref.read(settingsProvider.notifier).setCheckForUpdates(false);
         },
       );
+      return true;
     }
+
+    return false;
+  }
+
+  Future<void> _checkAppAnnouncement() async {
+    if (_hasCheckedAppAnnouncement) return;
+    _hasCheckedAppAnnouncement = true;
+
+    final locale = Localizations.localeOf(context).toLanguageTag();
+    final remoteConfigService = AppRemoteConfigService();
+    final announcement = await remoteConfigService.fetchActiveAnnouncement(
+      locale: locale,
+    );
+    if (announcement == null || !mounted) return;
+
+    showAppAnnouncementDialog(
+      context,
+      announcement: announcement,
+      onDismiss: () {
+        remoteConfigService.markAnnouncementDismissed(announcement.id);
+      },
+    );
   }
 
   static const _safMigrationShownKey = 'saf_migration_prompt_shown';

lib/screens/queue_tab.dart

@@ -10,6 +10,7 @@ import 'package:spotiflac_android/services/ffmpeg_service.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
 import 'package:spotiflac_android/utils/app_bar_layout.dart';
+import 'package:spotiflac_android/utils/audio_conversion_utils.dart';
 import 'package:spotiflac_android/utils/file_access.dart';
 import 'package:spotiflac_android/utils/lyrics_metadata_helper.dart';
 import 'package:spotiflac_android/models/download_item.dart';
@@ -41,6 +42,49 @@ import 'package:spotiflac_android/widgets/animation_utils.dart';
 part 'queue_tab_helpers.dart';
 part 'queue_tab_widgets.dart';
 
+String _formatDownloadSizeMB(num bytes) {
+  return '${(bytes / (1024 * 1024)).toStringAsFixed(1)} MB';
+}
+
+String _formatDownloadProgressLabel(BuildContext context, DownloadItem item) {
+  final progress = item.progress.clamp(0.0, 1.0);
+  final speedSuffix = item.speedMBps > 0
+      ? ' • ${item.speedMBps.toStringAsFixed(1)} MB/s'
+      : '';
+
+  if (item.bytesTotal > 0) {
+    final received = item.bytesReceived > 0
+        ? item.bytesReceived
+        : item.bytesTotal * progress;
+    final percent = (progress * 100).toStringAsFixed(0);
+    return '${_formatDownloadSizeMB(received)} / ${_formatDownloadSizeMB(item.bytesTotal)} • $percent%$speedSuffix';
+  }
+
+  if (item.bytesReceived > 0) {
+    final canEstimateTotal = progress > 0.01 && progress < 0.995;
+    if (canEstimateTotal) {
+      final estimatedTotal = item.bytesReceived / progress;
+      if (estimatedTotal > item.bytesReceived) {
+        return '${_formatDownloadSizeMB(item.bytesReceived)} / ~${_formatDownloadSizeMB(estimatedTotal)}$speedSuffix';
+      }
+    }
+    return '${_formatDownloadSizeMB(item.bytesReceived)}$speedSuffix';
+  }
+
+  if (progress > 0) {
+    final percent = (progress * 100).toStringAsFixed(0);
+    return '$percent%$speedSuffix';
+  }
+
+  if (item.speedMBps > 0) {
+    return context.l10n.queueDownloadSpeedStatus(
+      item.speedMBps.toStringAsFixed(1),
+    );
+  }
+
+  return context.l10n.queueDownloadStarting;
+}
+
 class QueueTab extends ConsumerStatefulWidget {
   final PageController? parentPageController;
   final int parentPageIndex;
@@ -1001,9 +1045,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
       context: context,
       builder: (ctx) => AlertDialog(
         title: Text(ctx.l10n.collectionDeletePlaylist),
-        content: Text(
-          'Delete $count ${count == 1 ? 'playlist' : 'playlists'}?',
-        ),
+        content: Text(ctx.l10n.collectionDeletePlaylistsMessage(count)),
         actions: [
           TextButton(
             onPressed: () => Navigator.pop(ctx, false),
@@ -1030,11 +1072,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     if (!context.mounted) return;
     _exitPlaylistSelectionMode();
     ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(
-          '$count ${count == 1 ? 'playlist' : 'playlists'} deleted',
-        ),
-      ),
+      SnackBar(content: Text(context.l10n.collectionPlaylistsDeleted(count))),
     );
   }
 
@@ -1363,6 +1401,18 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     return filePath.substring(dotIndex + 1).toLowerCase();
   }
 
+  String _itemFormatLower(UnifiedLibraryItem item) {
+    final localFormat = normalizeOptionalString(item.localItem?.format);
+    if (localFormat != null) {
+      return localFormat.toLowerCase().replaceAll('-', '_');
+    }
+    final historyFormat = normalizeOptionalString(item.historyItem?.format);
+    if (historyFormat != null) {
+      return historyFormat.toLowerCase().replaceAll('-', '_');
+    }
+    return _fileExtLower(item.filePath);
+  }
+
   List<UnifiedLibraryItem> _applyAdvancedFilters(
     List<UnifiedLibraryItem> items,
   ) {
@@ -1400,7 +1450,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
             }
 
             if (_filterFormat != null) {
-              final ext = _fileExtLower(item.filePath);
+              final ext = _itemFormatLower(item);
               if (ext != _filterFormat) return false;
             }
 
@@ -1533,8 +1583,21 @@ class _QueueTabState extends ConsumerState<QueueTab> {
   Set<String> _getAvailableFormats(List<UnifiedLibraryItem> items) {
     final formats = <String>{};
     for (final item in items) {
-      final ext = _fileExtLower(item.filePath);
-      if (['flac', 'mp3', 'm4a', 'opus', 'ogg', 'wav', 'aiff'].contains(ext)) {
+      final ext = _itemFormatLower(item);
+      if ([
+        'flac',
+        'alac',
+        'mp3',
+        'm4a',
+        'aac',
+        'eac3',
+        'ac3',
+        'ac4',
+        'opus',
+        'ogg',
+        'wav',
+        'aiff',
+      ].contains(ext)) {
         formats.add(ext);
       }
     }
@@ -1785,7 +1848,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                                 ),
                               ),
                               FilterChip(
-                                label: const Text('Missing track number'),
+                                label: Text(
+                                  context
+                                      .l10n
+                                      .libraryFilterMetadataMissingTrackNumber,
+                                ),
                                 selected:
                                     tempMetadata == 'missing-track-number',
                                 onSelected: (_) => setSheetState(
@@ -1793,21 +1860,33 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                                 ),
                               ),
                               FilterChip(
-                                label: const Text('Missing disc number'),
+                                label: Text(
+                                  context
+                                      .l10n
+                                      .libraryFilterMetadataMissingDiscNumber,
+                                ),
                                 selected: tempMetadata == 'missing-disc-number',
                                 onSelected: (_) => setSheetState(
                                   () => tempMetadata = 'missing-disc-number',
                                 ),
                               ),
                               FilterChip(
-                                label: const Text('Missing artist'),
+                                label: Text(
+                                  context
+                                      .l10n
+                                      .libraryFilterMetadataMissingArtist,
+                                ),
                                 selected: tempMetadata == 'missing-artist',
                                 onSelected: (_) => setSheetState(
                                   () => tempMetadata = 'missing-artist',
                                 ),
                               ),
                               FilterChip(
-                                label: const Text('Incorrect ISRC format'),
+                                label: Text(
+                                  context
+                                      .l10n
+                                      .libraryFilterMetadataIncorrectIsrcFormat,
+                                ),
                                 selected:
                                     tempMetadata == 'incorrect-isrc-format',
                                 onSelected: (_) => setSheetState(
@@ -1815,7 +1894,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                                 ),
                               ),
                               FilterChip(
-                                label: const Text('Missing label'),
+                                label: Text(
+                                  context
+                                      .l10n
+                                      .libraryFilterMetadataMissingLabel,
+                                ),
                                 selected: tempMetadata == 'missing-label',
                                 onSelected: (_) => setSheetState(
                                   () => tempMetadata = 'missing-label',
@@ -2401,8 +2484,16 @@ class _QueueTabState extends ConsumerState<QueueTab> {
 
       if (!context.mounted) return;
       final message = addedCount > 0
-          ? 'Added $addedCount ${addedCount == 1 ? 'track' : 'tracks'} to $playlistName'
-                '${alreadyCount > 0 ? ' ($alreadyCount already in playlist)' : ''}'
+          ? alreadyCount > 0
+                ? context.l10n.collectionAddedTracksToPlaylistWithExisting(
+                    addedCount,
+                    playlistName,
+                    alreadyCount,
+                  )
+                : context.l10n.collectionAddedTracksToPlaylist(
+                    addedCount,
+                    playlistName,
+                  )
           : context.l10n.collectionAlreadyInPlaylist(playlistName);
       ScaffoldMessenger.of(
         context,
@@ -3107,7 +3198,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
               ).textTheme.bodySmall?.copyWith(fontWeight: FontWeight.w500),
             ),
             Text(
-              '$count ${count == 1 ? 'item' : 'items'}',
+              context.l10n.itemCount(count),
               maxLines: 1,
               overflow: TextOverflow.ellipsis,
               style: Theme.of(context).textTheme.labelSmall?.copyWith(
@@ -4601,7 +4692,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     final failedCount = total - successCount;
     final summary = failedCount <= 0
         ? '${context.l10n.trackReEnrichSuccess} ($successCount/$total)'
-        : '${context.l10n.trackReEnrichSuccess} ($successCount/$total) • Failed: $failedCount';
+        : context.l10n.trackReEnrichSuccessWithFailures(
+            successCount,
+            total,
+            failedCount,
+          );
     ScaffoldMessenger.of(
       context,
     ).showSnackBar(SnackBar(content: Text(summary)));
@@ -4657,46 +4752,39 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     for (final id in _selectedIds) {
       final item = itemsById[id];
       if (item == null) continue;
-      String nameToCheck;
-      if (item.historyItem?.safFileName != null &&
-          item.historyItem!.safFileName!.isNotEmpty) {
-        nameToCheck = item.historyItem!.safFileName!.toLowerCase();
-      } else if (item.localItem?.format != null &&
-          item.localItem!.format!.isNotEmpty) {
-        nameToCheck = '.${item.localItem!.format!.toLowerCase()}';
-      } else {
-        nameToCheck = item.filePath.toLowerCase();
-      }
-      final ext = nameToCheck.endsWith('.flac')
-          ? 'FLAC'
-          : nameToCheck.endsWith('.m4a')
-          ? 'M4A'
-          : nameToCheck.endsWith('.mp3')
-          ? 'MP3'
-          : (nameToCheck.endsWith('.opus') || nameToCheck.endsWith('.ogg'))
-          ? 'Opus'
-          : null;
-      if (ext != null) sourceFormats.add(ext);
+      final sourceFormat = convertibleAudioSourceFormat(
+        storedFormat: item.localItem?.format ?? item.historyItem?.format,
+        filePath: item.filePath,
+        fileName: item.historyItem?.safFileName,
+      );
+      if (sourceFormat != null) sourceFormats.add(sourceFormat);
     }
 
-    final formats = ['ALAC', 'FLAC', 'MP3', 'Opus'].where((target) {
-      return sourceFormats.any((src) {
-        if (src == target) return false;
-        final isLosslessTarget = target == 'ALAC' || target == 'FLAC';
-        final isLosslessSource = src == 'FLAC' || src == 'M4A';
-        if (isLosslessTarget && !isLosslessSource) return false;
-        return true;
-      });
-    }).toList();
+    final formats = audioConversionTargetFormats
+        .where(
+          (target) => sourceFormats.any(
+            (source) => canConvertAudioFormat(
+              sourceFormat: source,
+              targetFormat: target,
+            ),
+          ),
+        )
+        .toList();
 
     if (formats.isEmpty) return;
 
     String selectedFormat = formats.first;
     bool isLosslessTarget =
         selectedFormat == 'ALAC' || selectedFormat == 'FLAC';
+    String defaultBitrateForFormat(String format) {
+      if (format == 'Opus') return '128k';
+      if (format == 'AAC') return '256k';
+      return '320k';
+    }
+
     String selectedBitrate = isLosslessTarget
         ? '320k'
-        : (selectedFormat == 'Opus' ? '128k' : '320k');
+        : defaultBitrateForFormat(selectedFormat);
     var didStartConversion = false;
 
     _hideSelectionOverlay();
@@ -4762,9 +4850,9 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                                 isLosslessTarget =
                                     format == 'ALAC' || format == 'FLAC';
                                 if (!isLosslessTarget) {
-                                  selectedBitrate = format == 'Opus'
-                                      ? '128k'
-                                      : '320k';
+                                  selectedBitrate = defaultBitrateForFormat(
+                                    format,
+                                  );
                                 }
                               });
                             }
@@ -4875,29 +4963,18 @@ class _QueueTabState extends ConsumerState<QueueTab> {
     for (final id in _selectedIds) {
       final item = itemsById[id];
       if (item == null) continue;
-      String nameToCheck;
-      if (item.historyItem?.safFileName != null &&
-          item.historyItem!.safFileName!.isNotEmpty) {
-        nameToCheck = item.historyItem!.safFileName!.toLowerCase();
-      } else if (item.localItem?.format != null &&
-          item.localItem!.format!.isNotEmpty) {
-        nameToCheck = '.${item.localItem!.format!.toLowerCase()}';
-      } else {
-        nameToCheck = item.filePath.toLowerCase();
+      final sourceFormat = convertibleAudioSourceFormat(
+        storedFormat: item.localItem?.format ?? item.historyItem?.format,
+        filePath: item.filePath,
+        fileName: item.historyItem?.safFileName,
+      );
+      if (sourceFormat == null ||
+          !canConvertAudioFormat(
+            sourceFormat: sourceFormat,
+            targetFormat: targetFormat,
+          )) {
+        continue;
       }
-      final ext = nameToCheck.endsWith('.flac')
-          ? 'FLAC'
-          : nameToCheck.endsWith('.m4a')
-          ? 'M4A'
-          : nameToCheck.endsWith('.mp3')
-          ? 'MP3'
-          : (nameToCheck.endsWith('.opus') || nameToCheck.endsWith('.ogg'))
-          ? 'Opus'
-          : null;
-      if (ext == null || ext == targetFormat) continue;
-      final isLosslessTarget = targetFormat == 'ALAC' || targetFormat == 'FLAC';
-      final isLosslessSource = ext == 'FLAC' || ext == 'M4A';
-      if (isLosslessTarget && !isLosslessSource) continue;
       selectedItems.add(item);
     }
 
@@ -5065,6 +5142,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 mimeType = 'audio/opus';
                 break;
               case 'alac':
+              case 'aac':
                 newExt = '.m4a';
                 mimeType = 'audio/mp4';
                 break;
@@ -5099,15 +5177,22 @@ class _QueueTabState extends ConsumerState<QueueTab> {
               continue;
             }
 
-            try {
-              await PlatformBridge.safDelete(item.filePath);
-            } catch (_) {}
+            if (!isSameContentUri(item.filePath, safUri)) {
+              try {
+                await PlatformBridge.safDelete(item.filePath);
+              } catch (_) {}
+            }
 
             await historyDb.updateFilePath(
               hi.id,
               safUri,
               newSafFileName: newFileName,
               newQuality: newQuality,
+              newFormat: normalizedConvertedAudioFormat(targetFormat),
+              newBitrate: convertedAudioBitrateKbps(
+                targetFormat: targetFormat,
+                bitrate: bitrate,
+              ),
               clearAudioSpecs: true,
             );
           }
@@ -5170,6 +5255,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 mimeType = 'audio/opus';
                 break;
               case 'alac':
+              case 'aac':
                 newExt = '.m4a';
                 mimeType = 'audio/mp4';
                 break;
@@ -5204,9 +5290,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
               continue;
             }
 
-            try {
-              await PlatformBridge.safDelete(item.filePath);
-            } catch (_) {}
+            if (!isSameContentUri(item.filePath, safUri)) {
+              try {
+                await PlatformBridge.safDelete(item.filePath);
+              } catch (_) {}
+            }
             await LibraryDatabase.instance.replaceWithConvertedItem(
               item: item.localItem!,
               newFilePath: safUri,
@@ -5228,6 +5316,11 @@ class _QueueTabState extends ConsumerState<QueueTab> {
             item.historyItem!.id,
             newPath,
             newQuality: newQuality,
+            newFormat: normalizedConvertedAudioFormat(targetFormat),
+            newBitrate: convertedAudioBitrateKbps(
+              targetFormat: targetFormat,
+              bitrate: bitrate,
+            ),
             clearAudioSpecs: true,
           );
         } else if (item.localItem != null) {
@@ -5426,7 +5519,7 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                   icon: const Icon(Icons.delete_outline),
                   label: Text(
                     selectedCount > 0
-                        ? 'Delete $selectedCount ${selectedCount == 1 ? 'track' : 'tracks'}'
+                        ? context.l10n.selectionDeleteTracksCount(selectedCount)
                         : context.l10n.selectionSelectToDelete,
                   ),
                   style: FilledButton.styleFrom(
@@ -5541,43 +5634,31 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                               ?.copyWith(color: colorScheme.onSurfaceVariant),
                         ),
                         if (item.status == DownloadStatus.downloading) ...[
-                          const SizedBox(height: 8),
-                          Row(
-                            children: [
-                              Expanded(
-                                child: ClipRRect(
-                                  borderRadius: BorderRadius.circular(4),
-                                  child: LinearProgressIndicator(
-                                    value: item.progress > 0
-                                        ? item.progress
-                                        : null,
-                                    backgroundColor:
-                                        colorScheme.surfaceContainerHighest,
+                          const SizedBox(height: 6),
+                          Align(
+                            alignment: Alignment.centerRight,
+                            child: Text(
+                              _formatDownloadProgressLabel(context, item),
+                              maxLines: 1,
+                              overflow: TextOverflow.ellipsis,
+                              textAlign: TextAlign.right,
+                              style: Theme.of(context).textTheme.labelSmall
+                                  ?.copyWith(
                                     color: colorScheme.primary,
-                                    minHeight: 6,
+                                    fontWeight: FontWeight.bold,
                                   ),
-                                ),
-                              ),
-                              const SizedBox(width: 8),
-                              Text(
-                                item.bytesTotal > 0
-                                    ? '${(item.progress * 100).toStringAsFixed(0)}%'
-                                    : (item.bytesReceived > 0
-                                          ? '${(item.bytesReceived / (1024 * 1024)).toStringAsFixed(1)} MB${item.speedMBps > 0 ? ' • ${item.speedMBps.toStringAsFixed(1)} MB/s' : ''}'
-                                          : (item.progress > 0
-                                                ? (item.speedMBps > 0
-                                                      ? '${(item.progress * 100).toStringAsFixed(0)}% • ${item.speedMBps.toStringAsFixed(1)} MB/s'
-                                                      : '${(item.progress * 100).toStringAsFixed(0)}%')
-                                                : (item.speedMBps > 0
-                                                      ? 'Downloading • ${item.speedMBps.toStringAsFixed(1)} MB/s'
-                                                      : 'Starting...'))),
-                                style: Theme.of(context).textTheme.labelSmall
-                                    ?.copyWith(
-                                      color: colorScheme.primary,
-                                      fontWeight: FontWeight.bold,
-                                    ),
-                              ),
-                            ],
+                            ),
+                          ),
+                          const SizedBox(height: 3),
+                          ClipRRect(
+                            borderRadius: BorderRadius.circular(4),
+                            child: LinearProgressIndicator(
+                              value: item.progress > 0 ? item.progress : null,
+                              backgroundColor:
+                                  colorScheme.surfaceContainerHighest,
+                              color: colorScheme.primary,
+                              minHeight: 6,
+                            ),
                           ),
                         ],
                         if (item.status == DownloadStatus.failed) ...[
@@ -5998,7 +6079,9 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                 if (_isSelectionMode) ...[
                   Semantics(
                     checked: isSelected,
-                    label: isSelected ? 'Deselect track' : 'Select track',
+                    label: isSelected
+                        ? context.l10n.a11yDeselectTrack
+                        : context.l10n.a11ySelectTrack,
                     child: AnimatedSelectionCheckbox(
                       visible: true,
                       selected: isSelected,
@@ -6261,8 +6344,10 @@ class _QueueTabState extends ConsumerState<QueueTab> {
                           return fileExists
                               ? Semantics(
                                   button: true,
-                                  label:
-                                      'Play ${item.trackName} by ${item.artistName}',
+                                  label: context.l10n.a11yPlayTrackByArtist(
+                                    item.trackName,
+                                    item.artistName,
+                                  ),
                                   child: GestureDetector(
                                     onTap: () => _openFile(
                                       item.filePath,

lib/screens/queue_tab_helpers.dart

@@ -33,6 +33,21 @@ class UnifiedLibraryItem {
   });
 
   factory UnifiedLibraryItem.fromDownloadHistory(DownloadHistoryItem item) {
+    String? quality;
+    if (item.bitrate != null && item.bitrate! > 0) {
+      quality = buildDisplayAudioQuality(
+        bitrateKbps: item.bitrate,
+        format: item.format,
+      );
+    } else if (item.bitDepth != null &&
+        item.bitDepth! > 0 &&
+        item.sampleRate != null) {
+      quality = buildDisplayAudioQuality(
+        bitDepth: item.bitDepth,
+        sampleRate: item.sampleRate,
+      );
+    }
+    quality ??= item.quality;
     return UnifiedLibraryItem(
       id: 'dl_${item.id}',
       trackName: item.trackName,
@@ -40,11 +55,7 @@ class UnifiedLibraryItem {
       albumName: item.albumName,
       coverUrl: item.coverUrl,
       filePath: item.filePath,
-      quality: buildDisplayAudioQuality(
-        bitDepth: item.bitDepth,
-        sampleRate: item.sampleRate,
-        storedQuality: item.quality,
-      ),
+      quality: quality,
       addedAt: item.downloadedAt,
       source: LibraryItemSource.downloaded,
       historyItem: item,

lib/screens/repo_tab.dart

@@ -281,7 +281,9 @@ class _RepoTabState extends ConsumerState<RepoTab> {
                   child: Padding(
                     padding: const EdgeInsets.fromLTRB(16, 8, 16, 8),
                     child: Text(
-                      '${filteredExtensions.length} ${filteredExtensions.length == 1 ? 'extension' : 'extensions'}',
+                      context.l10n.storeExtensionsCount(
+                        filteredExtensions.length,
+                      ),
                       style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                         color: colorScheme.onSurfaceVariant,
                       ),
@@ -810,7 +812,9 @@ class _ExtensionItem extends StatelessWidget {
                               ),
                               const SizedBox(width: 4),
                               Text(
-                                'Requires v${extension.minAppVersion}+',
+                                context.l10n.storeRequiresVersion(
+                                  extension.minAppVersion ?? '',
+                                ),
                                 style: Theme.of(context).textTheme.labelSmall
                                     ?.copyWith(
                                       color: colorScheme.onErrorContainer,
@@ -862,7 +866,7 @@ class _ExtensionItem extends StatelessWidget {
                         Icon(Icons.check, size: 16, color: colorScheme.outline),
                         const SizedBox(width: 4),
                         Text(
-                          'Installed',
+                          context.l10n.storeInstalled,
                           style: TextStyle(color: colorScheme.outline),
                         ),
                       ],

lib/screens/settings/about_page.dart

@@ -141,7 +141,8 @@ class AboutPage extends StatelessWidget {
                     icon: Icons.lyrics_outlined,
                     title: 'Paxsenix',
                     subtitle:
-                        'Partner lyrics proxy for Apple Music and QQ Music sources',
+                        'Lyrics proxy for Musixmatch, Netease, Apple Music, '
+                        'QQ Music, Spotify, Deezer, YouTube, Kugou, and Genius',
                     onTap: () => _launchUrl('https://lyrics.paxsenix.org'),
                     showDivider: false,
                   ),
@@ -302,7 +303,7 @@ class _AppHeaderCard extends StatelessWidget {
                   shape: BoxShape.circle,
                 ),
                 child: Image.asset(
-                  'assets/images/logo-transparant.png',
+                  'assets/images/logo-transparent.png',
                   color: colorScheme.onPrimary,
                   fit: BoxFit.contain,
                   errorBuilder: (_, _, _) => ClipRRect(

lib/screens/settings/donate_page.dart

@@ -1,13 +1,58 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:url_launcher/url_launcher.dart';
-import 'package:spotiflac_android/constants/app_info.dart';
+import 'package:spotiflac_android/services/app_remote_config_service.dart';
 import 'package:spotiflac_android/utils/app_bar_layout.dart';
 import 'package:spotiflac_android/widgets/donate_icons.dart';
 
-class DonatePage extends StatelessWidget {
+class DonatePage extends StatefulWidget {
   const DonatePage({super.key});
 
+  @override
+  State<DonatePage> createState() => _DonatePageState();
+}
+
+class _DonatePageState extends State<DonatePage> {
+  DonateConfig _config = DonateConfig.fallback();
+  bool _hasRequestedConfig = false;
+  String? _activeRemoteJson;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    if (_hasRequestedConfig) return;
+
+    _hasRequestedConfig = true;
+    _loadConfig(Localizations.localeOf(context).toLanguageTag());
+  }
+
+  Future<void> _loadConfig(String locale) async {
+    final service = AppRemoteConfigService();
+    final cached = await service.readCachedConfig();
+    if (!mounted) return;
+
+    if (cached != null) {
+      _applyRemoteConfig(cached);
+    }
+
+    unawaited(_refreshConfigCache(locale));
+  }
+
+  Future<void> _refreshConfigCache(String locale) async {
+    await AppRemoteConfigService().fetchConfigSnapshot(locale: locale);
+  }
+
+  void _applyRemoteConfig(RemoteConfigSnapshot snapshot) {
+    if (_activeRemoteJson == snapshot.rawJson) return;
+
+    setState(() {
+      _activeRemoteJson = snapshot.rawJson;
+      _config = snapshot.config.donate;
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     final colorScheme = Theme.of(context).colorScheme;
@@ -57,94 +102,16 @@ class DonatePage extends StatelessWidget {
               padding: const EdgeInsets.all(16),
               child: Column(
                 children: [
-                  _DonateLinksCard(colorScheme: colorScheme),
-
+                  _DonateLinksCard(colorScheme: colorScheme, config: _config),
                   const SizedBox(height: 24),
-
-                  _RecentDonorsCard(colorScheme: colorScheme),
-
+                  _RecentDonorsCard(
+                    colorScheme: colorScheme,
+                    supporters: _config.supporters,
+                  ),
                   const SizedBox(height: 16),
-
-                  Card(
-                    elevation: 0,
-                    color: colorScheme.secondaryContainer.withValues(
-                      alpha: 0.3,
-                    ),
-                    shape: RoundedRectangleBorder(
-                      borderRadius: BorderRadius.circular(20),
-                    ),
-                    child: Padding(
-                      padding: const EdgeInsets.all(16),
-                      child: Column(
-                        crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
-                          Row(
-                            children: [
-                              Icon(
-                                Icons.volunteer_activism_rounded,
-                                size: 20,
-                                color: colorScheme.primary,
-                              ),
-                              const SizedBox(width: 8),
-                              Text(
-                                'Good to Know',
-                                style: Theme.of(context).textTheme.titleSmall
-                                    ?.copyWith(
-                                      fontWeight: FontWeight.w600,
-                                      color: colorScheme.onSurface,
-                                    ),
-                              ),
-                            ],
-                          ),
-                          const SizedBox(height: 10),
-                          _NoticeLine(
-                            icon: Icons.block,
-                            text:
-                                'Not selling early access, premium features, or paywalls',
-                            colorScheme: colorScheme,
-                          ),
-                          const SizedBox(height: 6),
-                          _NoticeLine(
-                            icon: Icons.build_outlined,
-                            text: 'Funds go to dev tools & testing devices',
-                            colorScheme: colorScheme,
-                          ),
-                          const SizedBox(height: 6),
-                          _NoticeLine(
-                            icon: Icons.favorite_border,
-                            text:
-                                'Your support is the only way to keep this project alive',
-                            colorScheme: colorScheme,
-                          ),
-                          Divider(
-                            height: 24,
-                            color: colorScheme.outlineVariant.withValues(
-                              alpha: 0.3,
-                            ),
-                          ),
-                          _NoticeLine(
-                            icon: Icons.history,
-                            text:
-                                'Your name stays permanently in every version it was included in',
-                            colorScheme: colorScheme,
-                          ),
-                          const SizedBox(height: 6),
-                          _NoticeLine(
-                            icon: Icons.update,
-                            text:
-                                'Supporter list is updated monthly and embedded in the app',
-                            colorScheme: colorScheme,
-                          ),
-                          const SizedBox(height: 6),
-                          _NoticeLine(
-                            icon: Icons.cloud_off,
-                            text:
-                                'No remote server -- everything is stored locally',
-                            colorScheme: colorScheme,
-                          ),
-                        ],
-                      ),
-                    ),
+                  _DonateNoticeCard(
+                    colorScheme: colorScheme,
+                    notices: _config.notices,
                   ),
                 ],
               ),
@@ -156,16 +123,112 @@ class DonatePage extends StatelessWidget {
   }
 }
 
-class _RecentDonorsCard extends StatelessWidget {
+class _DonateLinksCard extends StatelessWidget {
   final ColorScheme colorScheme;
+  final DonateConfig config;
 
-  const _RecentDonorsCard({required this.colorScheme});
+  const _DonateLinksCard({required this.colorScheme, required this.config});
 
   @override
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
-    const donorNames = <String>[];
+    final cardColor = isDark
+        ? Color.alphaBlend(
+            Colors.white.withValues(alpha: 0.08),
+            colorScheme.surface,
+          )
+        : Color.alphaBlend(
+            Colors.black.withValues(alpha: 0.04),
+            colorScheme.surface,
+          );
 
+    return Card(
+      elevation: 0,
+      color: cardColor,
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
+      clipBehavior: Clip.antiAlias,
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Padding(
+            padding: const EdgeInsets.fromLTRB(20, 18, 20, 14),
+            child: Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Expanded(
+                  child: Column(
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(
+                        config.title,
+                        style: Theme.of(context).textTheme.titleMedium
+                            ?.copyWith(
+                              fontWeight: FontWeight.w700,
+                              color: colorScheme.onSurface,
+                            ),
+                      ),
+                      const SizedBox(height: 4),
+                      Text(
+                        config.message,
+                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                          color: colorScheme.onSurfaceVariant,
+                          height: 1.35,
+                        ),
+                      ),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+          Divider(
+            height: 1,
+            thickness: 1,
+            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+          ),
+          if (!config.enabled)
+            Padding(
+              padding: const EdgeInsets.all(20),
+              child: Text(
+                'Donation links are currently unavailable.',
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                ),
+              ),
+            )
+          else
+            for (var index = 0; index < config.methods.length; index++) ...[
+              _DonateMethodItem(
+                method: config.methods[index],
+                colorScheme: colorScheme,
+              ),
+              if (index < config.methods.length - 1)
+                Divider(
+                  height: 1,
+                  thickness: 1,
+                  indent: 74,
+                  endIndent: 16,
+                  color: colorScheme.outlineVariant.withValues(alpha: 0.3),
+                ),
+            ],
+        ],
+      ),
+    );
+  }
+}
+
+class _RecentDonorsCard extends StatelessWidget {
+  final ColorScheme colorScheme;
+  final List<String> supporters;
+
+  const _RecentDonorsCard({
+    required this.colorScheme,
+    required this.supporters,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final isDark = Theme.of(context).brightness == Brightness.dark;
     final cardColor = isDark
         ? Color.alphaBlend(
             Colors.white.withValues(alpha: 0.08),
@@ -206,7 +269,7 @@ class _RecentDonorsCard extends StatelessWidget {
               ),
             ),
             const SizedBox(height: 16),
-            if (donorNames.isEmpty)
+            if (supporters.isEmpty)
               Center(
                 child: Padding(
                   padding: const EdgeInsets.symmetric(vertical: 8),
@@ -221,7 +284,7 @@ class _RecentDonorsCard extends StatelessWidget {
                       ),
                       const SizedBox(height: 8),
                       Text(
-                        'No supporters yet — be the first!',
+                        'No supporters yet - be the first!',
                         style: Theme.of(context).textTheme.bodyMedium?.copyWith(
                           color: colorScheme.onSurfaceVariant.withValues(
                             alpha: 0.6,
@@ -236,7 +299,7 @@ class _RecentDonorsCard extends StatelessWidget {
               Wrap(
                 spacing: 8,
                 runSpacing: 8,
-                children: donorNames
+                children: supporters
                     .map(
                       (name) =>
                           _SupporterChip(name: name, colorScheme: colorScheme),
@@ -250,135 +313,49 @@ class _RecentDonorsCard extends StatelessWidget {
   }
 }
 
-class _DonateLinksCard extends StatelessWidget {
+class _DonateNoticeCard extends StatelessWidget {
   final ColorScheme colorScheme;
+  final List<String> notices;
 
-  const _DonateLinksCard({required this.colorScheme});
+  const _DonateNoticeCard({required this.colorScheme, required this.notices});
 
   @override
   Widget build(BuildContext context) {
-    final isDark = Theme.of(context).brightness == Brightness.dark;
-    final cardColor = isDark
-        ? Color.alphaBlend(
-            Colors.white.withValues(alpha: 0.08),
-            colorScheme.surface,
-          )
-        : Color.alphaBlend(
-            Colors.black.withValues(alpha: 0.04),
-            colorScheme.surface,
-          );
-
     return Card(
       elevation: 0,
-      color: cardColor,
+      color: colorScheme.secondaryContainer.withValues(alpha: 0.3),
       shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
-      clipBehavior: Clip.antiAlias,
-      child: Column(
-        children: [
-          _DonateCardItem(
-            title: 'Ko-fi',
-            subtitle: 'ko-fi.com/zarzet',
-            customIcon: const KofiIcon(size: 22, color: Colors.white),
-            color: const Color(0xFFFF5E5B),
-            url: AppInfo.kofiUrl,
-            colorScheme: colorScheme,
-          ),
-          Divider(
-            height: 1,
-            thickness: 1,
-            indent: 74,
-            endIndent: 16,
-            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
-          ),
-          _DonateCardItem(
-            title: 'GitHub Sponsors',
-            subtitle: 'github.com/sponsors/zarzet',
-            customIcon: const GitHubIcon(size: 22, color: Colors.white),
-            color: const Color(0xFF2D333B),
-            url: AppInfo.githubSponsorsUrl,
-            colorScheme: colorScheme,
-          ),
-          Divider(
-            height: 1,
-            thickness: 1,
-            indent: 74,
-            endIndent: 16,
-            color: colorScheme.outlineVariant.withValues(alpha: 0.3),
-          ),
-          _CryptoWalletItem(
-            title: 'USDT (TRC20)',
-            walletAddress: 'TL7iAqjq9M8BwVMi9AtHvuAGHtdwEvsDta',
-            color: const Color(0xFF26A17B),
-            colorScheme: colorScheme,
-          ),
-        ],
-      ),
-    );
-  }
-}
-
-class _DonateCardItem extends StatelessWidget {
-  final String title;
-  final String subtitle;
-  final Widget customIcon;
-  final Color color;
-  final String url;
-  final ColorScheme colorScheme;
-
-  const _DonateCardItem({
-    required this.title,
-    required this.subtitle,
-    required this.customIcon,
-    required this.color,
-    required this.url,
-    required this.colorScheme,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    return InkWell(
-      onTap: () =>
-          launchUrl(Uri.parse(url), mode: LaunchMode.externalApplication),
       child: Padding(
-        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
-        child: Row(
+        padding: const EdgeInsets.all(16),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Container(
-              width: 44,
-              height: 44,
-              decoration: BoxDecoration(
-                color: color,
-                borderRadius: BorderRadius.circular(12),
-              ),
-              child: Center(child: customIcon),
-            ),
-            const SizedBox(width: 14),
-            Expanded(
-              child: Column(
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
-                  Text(
-                    title,
-                    style: Theme.of(context).textTheme.titleMedium?.copyWith(
-                      fontWeight: FontWeight.w600,
-                      color: colorScheme.onSurface,
-                    ),
+            Row(
+              children: [
+                Icon(
+                  Icons.volunteer_activism_rounded,
+                  size: 20,
+                  color: colorScheme.primary,
+                ),
+                const SizedBox(width: 8),
+                Text(
+                  'Good to Know',
+                  style: Theme.of(context).textTheme.titleSmall?.copyWith(
+                    fontWeight: FontWeight.w600,
+                    color: colorScheme.onSurface,
                   ),
-                  const SizedBox(height: 2),
-                  Text(
-                    subtitle,
-                    style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                      color: colorScheme.onSurfaceVariant,
-                    ),
-                  ),
-                ],
+                ),
+              ],
+            ),
+            const SizedBox(height: 10),
+            for (var index = 0; index < notices.length; index++) ...[
+              _NoticeLine(
+                icon: _noticeIcon(index),
+                text: notices[index],
+                colorScheme: colorScheme,
               ),
-            ),
-            Icon(
-              Icons.open_in_new,
-              size: 18,
-              color: colorScheme.onSurfaceVariant,
-            ),
+              if (index < notices.length - 1) const SizedBox(height: 6),
+            ],
           ],
         ),
       ),
@@ -386,32 +363,18 @@ class _DonateCardItem extends StatelessWidget {
   }
 }
 
-class _CryptoWalletItem extends StatelessWidget {
-  final String title;
-  final String walletAddress;
-  final Color color;
+class _DonateMethodItem extends StatelessWidget {
+  final DonateMethod method;
   final ColorScheme colorScheme;
 
-  const _CryptoWalletItem({
-    required this.title,
-    required this.walletAddress,
-    required this.color,
-    required this.colorScheme,
-  });
+  const _DonateMethodItem({required this.method, required this.colorScheme});
 
   @override
   Widget build(BuildContext context) {
+    final color = Color(method.color);
+
     return InkWell(
-      onTap: () {
-        Clipboard.setData(ClipboardData(text: walletAddress));
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
-            content: Text('$title address copied to clipboard'),
-            behavior: SnackBarBehavior.floating,
-            duration: const Duration(seconds: 2),
-          ),
-        );
-      },
+      onTap: () => _handleTap(context),
       child: Padding(
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
         child: Row(
@@ -423,16 +386,7 @@ class _CryptoWalletItem extends StatelessWidget {
                 color: color,
                 borderRadius: BorderRadius.circular(12),
               ),
-              child: const Center(
-                child: Text(
-                  '\$',
-                  style: TextStyle(
-                    color: Colors.white,
-                    fontSize: 22,
-                    fontWeight: FontWeight.bold,
-                  ),
-                ),
-              ),
+              child: Center(child: _methodIcon(method)),
             ),
             const SizedBox(width: 14),
             Expanded(
@@ -440,7 +394,7 @@ class _CryptoWalletItem extends StatelessWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Text(
-                    title,
+                    method.title,
                     style: Theme.of(context).textTheme.titleMedium?.copyWith(
                       fontWeight: FontWeight.w600,
                       color: colorScheme.onSurface,
@@ -448,10 +402,12 @@ class _CryptoWalletItem extends StatelessWidget {
                   ),
                   const SizedBox(height: 2),
                   Text(
-                    walletAddress,
+                    method.subtitle.isEmpty
+                        ? method.walletAddress ?? method.url ?? ''
+                        : method.subtitle,
                     style: Theme.of(context).textTheme.bodySmall?.copyWith(
                       color: colorScheme.onSurfaceVariant,
-                      fontSize: 11,
+                      fontSize: method.isWallet ? 11 : null,
                     ),
                     overflow: TextOverflow.ellipsis,
                   ),
@@ -459,7 +415,7 @@ class _CryptoWalletItem extends StatelessWidget {
               ),
             ),
             Icon(
-              Icons.copy_rounded,
+              method.isWallet ? Icons.copy_rounded : Icons.open_in_new,
               size: 18,
               color: colorScheme.onSurfaceVariant,
             ),
@@ -468,6 +424,30 @@ class _CryptoWalletItem extends StatelessWidget {
       ),
     );
   }
+
+  Future<void> _handleTap(BuildContext context) async {
+    if (method.isWallet) {
+      await Clipboard.setData(ClipboardData(text: method.walletAddress!));
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('${method.title} address copied to clipboard'),
+            behavior: SnackBarBehavior.floating,
+            duration: const Duration(seconds: 2),
+          ),
+        );
+      }
+      return;
+    }
+
+    final url = method.url;
+    if (url == null || url.isEmpty) return;
+
+    final uri = Uri.tryParse(url);
+    if (uri == null) return;
+
+    await launchUrl(uri, mode: LaunchMode.externalApplication);
+  }
 }
 
 class _SupporterChip extends StatelessWidget {
@@ -543,3 +523,44 @@ class _NoticeLine extends StatelessWidget {
     );
   }
 }
+
+Widget _methodIcon(DonateMethod method) {
+  switch (method.icon.toLowerCase()) {
+    case 'kofi':
+    case 'ko-fi':
+      return const KofiIcon(size: 22, color: Colors.white);
+    case 'github':
+    case 'github-sponsors':
+      return const GitHubIcon(size: 22, color: Colors.white);
+    case 'crypto':
+    case 'wallet':
+      return const Text(
+        '\$',
+        style: TextStyle(
+          color: Colors.white,
+          fontSize: 22,
+          fontWeight: FontWeight.bold,
+        ),
+      );
+    case 'coffee':
+      return const Icon(
+        Icons.local_cafe_rounded,
+        color: Colors.white,
+        size: 22,
+      );
+    case 'heart':
+    default:
+      return const Icon(Icons.favorite_rounded, color: Colors.white, size: 22);
+  }
+}
+
+IconData _noticeIcon(int index) {
+  const icons = [
+    Icons.block,
+    Icons.build_outlined,
+    Icons.favorite_border,
+    Icons.history,
+    Icons.update,
+  ];
+  return icons[index % icons.length];
+}

lib/screens/settings/download_settings_page.dart

@@ -199,10 +199,10 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                   if (Platform.isAndroid)
                     SettingsSwitchItem(
                       icon: Icons.downloading_outlined,
-                      title: 'Native download worker',
+                      title: context.l10n.downloadNativeWorker,
                       titleTrailing: const _BetaBadge(),
                       subtitle: hasDownloadExtensions
-                          ? 'Beta Android service worker for extension downloads'
+                          ? context.l10n.downloadNativeWorkerSubtitle
                           : context.l10n.extensionsNoDownloadProvider,
                       value:
                           settings.nativeDownloadWorkerEnabled &&
@@ -382,6 +382,8 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
     switch (format) {
       case 'mp3_320':
         return context.l10n.downloadLossyMp3;
+      case 'aac_320':
+        return context.l10n.downloadLossyAac;
       case 'opus_256':
         return context.l10n.downloadLossyOpus256;
       case 'opus_128':
@@ -441,6 +443,20 @@ class _DownloadSettingsPageState extends ConsumerState<DownloadSettingsPage> {
                 Navigator.pop(context);
               },
             ),
+            ListTile(
+              leading: const Icon(Icons.album_outlined),
+              title: Text(context.l10n.downloadLossyAac),
+              subtitle: Text(context.l10n.downloadLossyAacSubtitle),
+              trailing: current == 'aac_320'
+                  ? Icon(Icons.check, color: colorScheme.primary)
+                  : null,
+              onTap: () {
+                ref
+                    .read(settingsProvider.notifier)
+                    .setTidalHighFormat('aac_320');
+                Navigator.pop(context);
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.graphic_eq),
               title: Text(context.l10n.downloadLossyOpus256),
@@ -829,7 +845,7 @@ class _BetaBadge extends StatelessWidget {
         borderRadius: BorderRadius.circular(6),
       ),
       child: Text(
-        'BETA',
+        context.l10n.badgeBeta,
         style: Theme.of(context).textTheme.labelSmall?.copyWith(
           color: colorScheme.onTertiaryContainer,
           fontWeight: FontWeight.w700,

lib/screens/settings/extension_detail_page.dart

@@ -253,8 +253,10 @@ class _ExtensionDetailPageState extends ConsumerState<ExtensionDetailPage> {
             ),
 
             if (extension.hasServiceHealth) ...[
-              const SliverToBoxAdapter(
-                child: SettingsSectionHeader(title: 'Service Status'),
+              SliverToBoxAdapter(
+                child: SettingsSectionHeader(
+                  title: context.l10n.extensionServiceStatus,
+                ),
               ),
               SliverToBoxAdapter(
                 child: SettingsGroup(
@@ -339,10 +341,12 @@ class _ExtensionDetailPageState extends ConsumerState<ExtensionDetailPage> {
                   ),
                   _CapabilityItem(
                     icon: Icons.monitor_heart_outlined,
-                    title: 'Service health',
+                    title: context.l10n.extensionServiceHealth,
                     enabled: extension.hasServiceHealth,
                     subtitle: extension.hasServiceHealth
-                        ? '${extension.serviceHealth.length} check${extension.serviceHealth.length == 1 ? '' : 's'} configured'
+                        ? context.l10n.extensionHealthChecksConfigured(
+                            extension.serviceHealth.length,
+                          )
                         : null,
                     showDivider: false,
                   ),
@@ -570,7 +574,7 @@ class _OauthLoginLinkPreview extends StatelessWidget {
     final text = value?.trim() ?? '';
     if (text.isEmpty) {
       return Text(
-        'Tap Connect to Spotify to fill this field.',
+        context.l10n.extensionOauthConnectHint,
         style: Theme.of(context).textTheme.bodySmall?.copyWith(
           color: colorScheme.onSurfaceVariant,
           fontStyle: FontStyle.italic,
@@ -725,18 +729,18 @@ IconData _healthStatusIcon(String status) {
   }
 }
 
-String _healthStatusLabel(String status) {
+String _healthStatusLabel(BuildContext context, String status) {
   switch (status) {
     case 'online':
-      return 'Online';
+      return context.l10n.extensionHealthOnline;
     case 'degraded':
-      return 'Degraded';
+      return context.l10n.extensionHealthDegraded;
     case 'offline':
-      return 'Offline';
+      return context.l10n.extensionHealthOffline;
     case 'unsupported':
-      return 'Not configured';
+      return context.l10n.extensionHealthNotConfigured;
     default:
-      return 'Unknown';
+      return context.l10n.extensionHealthUnknown;
   }
 }
 
@@ -771,7 +775,7 @@ class _HealthSummaryItem extends StatelessWidget {
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
                     Text(
-                      _healthStatusLabel(statusValue),
+                      _healthStatusLabel(context, statusValue),
                       style: Theme.of(context).textTheme.bodyLarge?.copyWith(
                         color: color,
                         fontWeight: FontWeight.w600,
@@ -780,7 +784,11 @@ class _HealthSummaryItem extends StatelessWidget {
                     if (status?.checkedAt != null) ...[
                       const SizedBox(height: 2),
                       Text(
-                        'Last checked ${TimeOfDay.fromDateTime(status!.checkedAt!.toLocal()).format(context)}',
+                        context.l10n.extensionLastChecked(
+                          TimeOfDay.fromDateTime(
+                            status!.checkedAt!.toLocal(),
+                          ).format(context),
+                        ),
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: colorScheme.onSurfaceVariant,
                         ),
@@ -790,7 +798,7 @@ class _HealthSummaryItem extends StatelessWidget {
                 ),
               ),
               IconButton(
-                tooltip: 'Refresh status',
+                tooltip: context.l10n.extensionRefreshStatus,
                 onPressed: isRefreshing ? null : onRefresh,
                 icon: isRefreshing
                     ? SizedBox(
@@ -829,11 +837,11 @@ class _HealthCheckItem extends StatelessWidget {
     final colorScheme = Theme.of(context).colorScheme;
     final color = _healthStatusColor(colorScheme, check.status);
     final detailParts = <String>[
-      _healthStatusLabel(check.status),
+      _healthStatusLabel(context, check.status),
       if (check.httpStatus != null) 'HTTP ${check.httpStatus}',
       if (check.serviceKey?.isNotEmpty == true) check.serviceKey!,
       if (check.latencyMs > 0) '${check.latencyMs} ms',
-      if (check.required) 'required',
+      if (check.required) context.l10n.extensionHealthRequired,
     ];
     final message = check.error?.trim().isNotEmpty == true
         ? check.error!
@@ -1090,7 +1098,8 @@ class _SettingItemState extends State<_SettingItem> {
                           )
                         else
                           Text(
-                            widget.value?.toString() ?? 'Not set',
+                            widget.value?.toString() ??
+                                context.l10n.extensionSettingNotSet,
                             style: Theme.of(context).textTheme.bodySmall
                                 ?.copyWith(color: colorScheme.primary),
                           ),
@@ -1144,7 +1153,7 @@ class _SettingItemState extends State<_SettingItem> {
           final error =
               payload['error'] as String? ??
               result['error'] as String? ??
-              'Action failed';
+              context.l10n.extensionActionFailed;
           ScaffoldMessenger.of(
             context,
           ).showSnackBar(SnackBar(content: Text(error)));
@@ -1206,7 +1215,8 @@ class _SettingItemState extends State<_SettingItem> {
               ? TextInputType.number
               : TextInputType.text,
           decoration: InputDecoration(
-            hintText: widget.setting.description ?? 'Enter value',
+            hintText:
+                widget.setting.description ?? context.l10n.extensionEnterValue,
             filled: true,
             fillColor: colorScheme.surfaceContainerHighest.withValues(
               alpha: 0.3,
@@ -1327,7 +1337,7 @@ class _PostProcessingHookItem extends StatelessWidget {
                     borderRadius: BorderRadius.circular(8),
                   ),
                   child: Text(
-                    'Auto',
+                    context.l10n.extensionsHomeFeedAuto,
                     style: Theme.of(context).textTheme.labelSmall?.copyWith(
                       color: colorScheme.onPrimaryContainer,
                     ),
@@ -1384,14 +1394,14 @@ class _URLHandlerInfo extends StatelessWidget {
                   crossAxisAlignment: CrossAxisAlignment.start,
                   children: [
                     Text(
-                      'Custom URL Handling',
+                      context.l10n.extensionCustomUrlHandling,
                       style: Theme.of(context).textTheme.titleMedium?.copyWith(
                         fontWeight: FontWeight.w600,
                       ),
                     ),
                     const SizedBox(height: 2),
                     Text(
-                      'This extension can handle links from these sites',
+                      context.l10n.extensionCustomUrlHandlingSubtitle,
                       style: Theme.of(context).textTheme.bodySmall?.copyWith(
                         color: colorScheme.onSurfaceVariant,
                       ),
@@ -1445,7 +1455,7 @@ class _URLHandlerInfo extends StatelessWidget {
                 const SizedBox(width: 12),
                 Expanded(
                   child: Text(
-                    'Share links from these sites to SpotiFLAC and this extension will handle them.',
+                    context.l10n.extensionCustomUrlHandlingShareHint,
                     style: Theme.of(context).textTheme.bodySmall?.copyWith(
                       color: colorScheme.onSurfaceVariant,
                     ),
@@ -1533,7 +1543,9 @@ class _QualityOptionItem extends StatelessWidget {
                     borderRadius: BorderRadius.circular(8),
                   ),
                   child: Text(
-                    '${quality.settings.length} setting${quality.settings.length > 1 ? 's' : ''}',
+                    context.l10n.extensionSettingsCount(
+                      quality.settings.length,
+                    ),
                     style: Theme.of(context).textTheme.labelSmall?.copyWith(
                       color: colorScheme.onSurfaceVariant,
                     ),

lib/screens/settings/extensions_page.dart

@@ -458,7 +458,7 @@ class _ExtensionItem extends StatelessWidget {
                                   context.l10n.extensionsErrorLoading
                             : serviceHealthStatus == null
                             ? 'v${extension.version}'
-                            : 'v${extension.version} · ${_extensionHealthLabel(serviceHealthStatus)}',
+                            : 'v${extension.version} · ${_extensionHealthLabel(context, serviceHealthStatus)}',
                         style: Theme.of(context).textTheme.bodySmall?.copyWith(
                           color: hasError
                               ? colorScheme.error
@@ -503,16 +503,16 @@ Color _extensionHealthColor(ColorScheme colorScheme, String status) {
   }
 }
 
-String _extensionHealthLabel(String status) {
+String _extensionHealthLabel(BuildContext context, String status) {
   switch (status) {
     case 'online':
-      return 'Online';
+      return context.l10n.extensionHealthOnline;
     case 'degraded':
-      return 'Degraded';
+      return context.l10n.extensionHealthDegraded;
     case 'offline':
-      return 'Offline';
+      return context.l10n.extensionHealthOffline;
     default:
-      return 'Unknown';
+      return context.l10n.extensionHealthUnknown;
   }
 }
 

lib/screens/settings/files_settings_page.dart

@@ -221,6 +221,7 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
                       icon: Icons.folder_outlined,
                       title: context.l10n.downloadAlbumFolderStructure,
                       subtitle: _getAlbumFolderStructureLabel(
+                        context,
                         settings.albumFolderStructure,
                       ),
                       onTap: () => _showAlbumFolderStructurePicker(
@@ -234,6 +235,7 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
                       icon: Icons.create_new_folder_outlined,
                       title: context.l10n.downloadFolderOrganization,
                       subtitle: _getFolderOrganizationLabel(
+                        context,
                         settings.folderOrganization,
                       ),
                       onTap: () => _showFolderOrganizationPicker(
@@ -375,35 +377,35 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
     );
   }
 
-  String _getAlbumFolderStructureLabel(String structure) {
+  String _getAlbumFolderStructureLabel(BuildContext context, String structure) {
     switch (structure) {
       case 'album_only':
-        return 'Albums/Album Name/';
+        return context.l10n.albumFolderAlbumOnlySubtitle;
       case 'artist_year_album':
-        return 'Albums/Artist/[Year] Album/';
+        return context.l10n.albumFolderArtistYearAlbumSubtitle;
       case 'year_album':
-        return 'Albums/[Year] Album/';
+        return context.l10n.albumFolderYearAlbumSubtitle;
       case 'artist_album_singles':
-        return 'Artist/Album/ + Artist/Singles/';
+        return context.l10n.albumFolderArtistAlbumSinglesSubtitle;
       case 'artist_album_flat':
-        return 'Artist/Album/ + Artist/song.flac';
+        return context.l10n.albumFolderArtistAlbumFlatSubtitle;
       default:
-        return 'Albums/Artist/Album Name/';
+        return context.l10n.albumFolderArtistAlbumSubtitle;
     }
   }
 
-  String _getFolderOrganizationLabel(String value) {
+  String _getFolderOrganizationLabel(BuildContext context, String value) {
     switch (value) {
       case 'playlist':
-        return 'By Playlist';
+        return context.l10n.folderOrganizationByPlaylist;
       case 'artist':
-        return 'By Artist';
+        return context.l10n.folderOrganizationByArtist;
       case 'album':
-        return 'By Album';
+        return context.l10n.folderOrganizationByAlbum;
       case 'artist_album':
-        return 'Artist/Album';
+        return context.l10n.folderOrganizationByArtistAlbum;
       default:
-        return 'None';
+        return context.l10n.folderOrganizationNone;
     }
   }
 
@@ -641,7 +643,7 @@ class _FilesSettingsPageState extends ConsumerState<FilesSettingsPage> {
                           SnackBar(
                             content: Text(
                               ctx.l10n.snackbarFolderPickerFailed(
-                                'Could not keep access to the selected folder',
+                                ctx.l10n.errorCouldNotKeepFolderAccess,
                               ),
                             ),
                             backgroundColor: Theme.of(ctx).colorScheme.error,

lib/screens/settings/library_settings_page.dart

@@ -480,7 +480,7 @@ class _LibrarySettingsPageState extends ConsumerState<LibrarySettingsPage> {
                             crossAxisAlignment: CrossAxisAlignment.start,
                             children: [
                               Text(
-                                'Scan cancelled',
+                                context.l10n.libraryScanCancelled,
                                 style: Theme.of(context).textTheme.bodyMedium
                                     ?.copyWith(
                                       fontWeight: FontWeight.w600,
@@ -489,7 +489,7 @@ class _LibrarySettingsPageState extends ConsumerState<LibrarySettingsPage> {
                               ),
                               const SizedBox(height: 2),
                               Text(
-                                'You can retry the scan when ready.',
+                                context.l10n.libraryScanCancelledSubtitle,
                                 style: Theme.of(context).textTheme.bodySmall
                                     ?.copyWith(
                                       color: colorScheme.onTertiaryContainer
@@ -760,7 +760,7 @@ class _LibraryHeroCard extends StatelessWidget {
                             ),
                             const SizedBox(width: 8),
                             Text(
-                              'Scanning...',
+                              context.l10n.libraryScanning,
                               style: TextStyle(
                                 color: colorScheme.onPrimary,
                                 fontSize: 12,
@@ -801,8 +801,9 @@ class _LibraryHeroCard extends StatelessWidget {
                 if (!isScanning && excludedDownloadedCount > 0) ...[
                   const SizedBox(height: 4),
                   Text(
-                    '$excludedDownloadedCount from Downloads history '
-                    '(excluded from list)',
+                    context.l10n.libraryDownloadsHistoryExcluded(
+                      excludedDownloadedCount,
+                    ),
                     maxLines: 1,
                     overflow: TextOverflow.ellipsis,
                     style: TextStyle(

lib/screens/settings/log_screen.dart

@@ -495,9 +495,9 @@ class _LogEntryTile extends StatelessWidget {
                         color: Colors.teal.withValues(alpha: 0.15),
                         borderRadius: BorderRadius.circular(4),
                       ),
-                      child: const Text(
-                        'Go',
-                        style: TextStyle(
+                      child: Text(
+                        context.l10n.actionGo,
+                        style: const TextStyle(
                           fontSize: 9,
                           fontWeight: FontWeight.bold,
                           color: Colors.teal,
@@ -597,7 +597,7 @@ class _LogSummaryCard extends StatelessWidget {
                   ),
                   const SizedBox(width: 8),
                   Text(
-                    'Issue Summary',
+                    context.l10n.logIssueSummary,
                     style: Theme.of(context).textTheme.titleSmall?.copyWith(
                       fontWeight: FontWeight.bold,
                       color: colorScheme.onSurface,
@@ -653,7 +653,7 @@ class _LogSummaryCard extends StatelessWidget {
 
               const SizedBox(height: 12),
               Text(
-                'Total errors: ${analysis.errorCount}',
+                context.l10n.logTotalErrors(analysis.errorCount),
                 style: Theme.of(context).textTheme.bodySmall?.copyWith(
                   color: colorScheme.onSurfaceVariant,
                 ),
@@ -807,7 +807,7 @@ class _IssueBadge extends StatelessWidget {
           if (domains != null && domains!.isNotEmpty) ...[
             const SizedBox(height: 4),
             Text(
-              'Affected: ${domains!.join(", ")}',
+              context.l10n.logAffectedDomains(domains!.join(', ')),
               style: Theme.of(context).textTheme.bodySmall?.copyWith(
                 color: colorScheme.onSurfaceVariant,
                 fontFamily: 'monospace',

lib/screens/settings/lyrics_provider_priority_page.dart

@@ -21,6 +21,11 @@ class _LyricsProviderPriorityPageState
     'musixmatch',
     'apple_music',
     'qqmusic',
+    'spotify',
+    'deezer',
+    'youtube',
+    'kugou',
+    'genius',
   ];
 
   late List<String> _enabledProviders;
@@ -211,6 +216,36 @@ class _LyricsProviderPriorityPageState
           description: context.l10n.lyricsProviderQqMusicDesc,
           icon: Icons.queue_music,
         );
+      case 'spotify':
+        return _LyricsProviderInfo(
+          name: 'Spotify',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.graphic_eq,
+        );
+      case 'deezer':
+        return _LyricsProviderInfo(
+          name: 'Deezer',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.album_outlined,
+        );
+      case 'youtube':
+        return _LyricsProviderInfo(
+          name: 'YouTube',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.smart_display_outlined,
+        );
+      case 'kugou':
+        return _LyricsProviderInfo(
+          name: 'Kugou',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.library_music_outlined,
+        );
+      case 'genius':
+        return _LyricsProviderInfo(
+          name: 'Genius',
+          description: context.l10n.lyricsProviderExtensionDesc,
+          icon: Icons.auto_awesome_outlined,
+        );
       default:
         return _LyricsProviderInfo(
           name: id,

lib/screens/settings/lyrics_settings_page.dart

@@ -77,8 +77,7 @@ class LyricsSettingsPage extends ConsumerWidget {
                     onChanged: (value) => ref
                         .read(settingsProvider.notifier)
                         .setEmbedLyrics(value),
-                    showDivider:
-                        settings.embedMetadata && settings.embedLyrics,
+                    showDivider: settings.embedMetadata && settings.embedLyrics,
                   ),
                   if (settings.embedMetadata && settings.embedLyrics) ...[
                     SettingsItem(
@@ -88,8 +87,11 @@ class LyricsSettingsPage extends ConsumerWidget {
                         context,
                         settings.lyricsMode,
                       ),
-                      onTap: () =>
-                          _showLyricsModePicker(context, ref, settings.lyricsMode),
+                      onTap: () => _showLyricsModePicker(
+                        context,
+                        ref,
+                        settings.lyricsMode,
+                      ),
                     ),
                     SettingsItem(
                       icon: Icons.source_outlined,
@@ -124,8 +126,12 @@ class LyricsSettingsPage extends ConsumerWidget {
                       icon: Icons.translate_outlined,
                       title: context.l10n.downloadNeteaseIncludeTranslation,
                       subtitle: settings.lyricsIncludeTranslationNetease
-                          ? context.l10n.downloadNeteaseIncludeTranslationEnabled
-                          : context.l10n.downloadNeteaseIncludeTranslationDisabled,
+                          ? context
+                                .l10n
+                                .downloadNeteaseIncludeTranslationEnabled
+                          : context
+                                .l10n
+                                .downloadNeteaseIncludeTranslationDisabled,
                       value: settings.lyricsIncludeTranslationNetease,
                       onChanged: (value) => ref
                           .read(settingsProvider.notifier)
@@ -157,6 +163,17 @@ class LyricsSettingsPage extends ConsumerWidget {
                           .read(settingsProvider.notifier)
                           .setLyricsMultiPersonWordByWord(value),
                     ),
+                    SettingsSwitchItem(
+                      icon: Icons.graphic_eq_outlined,
+                      title: context.l10n.downloadAppleElrcWordSync,
+                      subtitle: settings.lyricsAppleElrcWordSync
+                          ? context.l10n.downloadAppleElrcWordSyncEnabled
+                          : context.l10n.downloadAppleElrcWordSyncDisabled,
+                      value: settings.lyricsAppleElrcWordSync,
+                      onChanged: (value) => ref
+                          .read(settingsProvider.notifier)
+                          .setLyricsAppleElrcWordSync(value),
+                    ),
                     SettingsItem(
                       icon: Icons.language_outlined,
                       title: context.l10n.downloadMusixmatchLanguage,
@@ -199,6 +216,11 @@ class LyricsSettingsPage extends ConsumerWidget {
     'musixmatch': 'Musixmatch',
     'apple_music': 'Apple Music',
     'qqmusic': 'QQ Music',
+    'spotify': 'Spotify',
+    'deezer': 'Deezer',
+    'youtube': 'YouTube',
+    'kugou': 'Kugou',
+    'genius': 'Genius',
   };
 
   String _getLyricsProvidersSubtitle(
@@ -206,9 +228,7 @@ class LyricsSettingsPage extends ConsumerWidget {
     List<String> providers,
   ) {
     if (providers.isEmpty) return context.l10n.downloadProvidersNoneEnabled;
-    return providers
-        .map((p) => _providerDisplayNames[p] ?? p)
-        .join(' > ');
+    return providers.map((p) => _providerDisplayNames[p] ?? p).join(' > ');
   }
 
   void _showLyricsModePicker(
@@ -233,16 +253,18 @@ class LyricsSettingsPage extends ConsumerWidget {
               padding: const EdgeInsets.fromLTRB(24, 24, 24, 8),
               child: Text(
                 context.l10n.lyricsMode,
-                style: Theme.of(context).textTheme.titleLarge
-                    ?.copyWith(fontWeight: FontWeight.bold),
+                style: Theme.of(
+                  context,
+                ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
               ),
             ),
             Padding(
               padding: const EdgeInsets.fromLTRB(24, 0, 24, 16),
               child: Text(
                 context.l10n.lyricsModeDescription,
-                style: Theme.of(context).textTheme.bodyMedium
-                    ?.copyWith(color: colorScheme.onSurfaceVariant),
+                style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                  color: colorScheme.onSurfaceVariant,
+                ),
               ),
             ),
             ListTile(
@@ -311,14 +333,16 @@ class LyricsSettingsPage extends ConsumerWidget {
           children: [
             Text(
               context.l10n.downloadMusixmatchLanguage,
-              style: Theme.of(context).textTheme.titleLarge
-                  ?.copyWith(fontWeight: FontWeight.bold),
+              style: Theme.of(
+                context,
+              ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
             ),
             const SizedBox(height: 8),
             Text(
               context.l10n.downloadMusixmatchLanguageDesc,
-              style: Theme.of(context).textTheme.bodyMedium
-                  ?.copyWith(color: colorScheme.onSurfaceVariant),
+              style: Theme.of(context).textTheme.bodyMedium?.copyWith(
+                color: colorScheme.onSurfaceVariant,
+              ),
             ),
             const SizedBox(height: 16),
             TextField(

lib/screens/setup_screen.dart

@@ -106,6 +106,8 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
   }
 
   Future<void> _requestStoragePermission() async {
+    final permissionAudio = context.l10n.permissionAudio;
+    final permissionStorage = context.l10n.permissionStorage;
     setState(() => _isLoading = true);
     try {
       if (Platform.isIOS) {
@@ -121,7 +123,7 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
           allGranted = audioStatus.isGranted;
 
           if (audioStatus.isPermanentlyDenied) {
-            await _showPermissionDeniedDialog('Audio');
+            await _showPermissionDeniedDialog(permissionAudio);
             return;
           }
         } else if (_androidSdkVersion >= 30) {
@@ -139,7 +141,7 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
           final status = await Permission.storage.request();
           allGranted = status.isGranted;
           if (status.isPermanentlyDenied) {
-            await _showPermissionDeniedDialog('Storage');
+            await _showPermissionDeniedDialog(permissionStorage);
             return;
           }
         }
@@ -184,6 +186,7 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
   }
 
   Future<void> _requestNotificationPermission() async {
+    final permissionNotification = context.l10n.permissionNotification;
     setState(() => _isLoading = true);
     try {
       if (Platform.isIOS) {
@@ -191,14 +194,14 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
         if (status.isGranted || status.isProvisional) {
           setState(() => _notificationPermissionGranted = true);
         } else if (status.isPermanentlyDenied) {
-          await _showPermissionDeniedDialog('Notification');
+          await _showPermissionDeniedDialog(permissionNotification);
         }
       } else if (_androidSdkVersion >= 33) {
         final status = await Permission.notification.request();
         if (status.isGranted) {
           setState(() => _notificationPermissionGranted = true);
         } else if (status.isPermanentlyDenied) {
-          await _showPermissionDeniedDialog('Notification');
+          await _showPermissionDeniedDialog(permissionNotification);
         }
       } else {
         setState(() => _notificationPermissionGranted = true);
@@ -392,7 +395,8 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
                       ScaffoldMessenger.of(context).showSnackBar(
                         SnackBar(
                           content: Text(
-                            validation.errorReason ?? 'Invalid folder selected',
+                            validation.errorReason ??
+                                context.l10n.errorInvalidFolderSelected,
                           ),
                           backgroundColor: Theme.of(context).colorScheme.error,
                           duration: const Duration(seconds: 4),
@@ -410,7 +414,7 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
                         SnackBar(
                           content: Text(
                             context.l10n.snackbarFolderPickerFailed(
-                              'Could not keep access to the selected folder',
+                              context.l10n.errorCouldNotKeepFolderAccess,
                             ),
                           ),
                           backgroundColor: Theme.of(context).colorScheme.error,
@@ -681,7 +685,7 @@ class _SetupScreenState extends ConsumerState<SetupScreen> {
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
                 Image.asset(
-                  'assets/images/logo-transparant.png',
+                  'assets/images/logo-transparent.png',
                   width: logoSize,
                   height: logoSize,
                   color: colorScheme.primary,

lib/screens/store/extension_details_screen.dart

@@ -194,7 +194,7 @@ class _ExtensionDetailsScreenState
                       textColor: colorScheme.onSecondaryContainer,
                     ),
                     _Badge(
-                      label: _getCategoryName(ext.category),
+                      label: _getCategoryName(context, ext.category),
                       color: colorScheme.tertiaryContainer,
                       textColor: colorScheme.onTertiaryContainer,
                     ),
@@ -390,7 +390,7 @@ class _ExtensionDetailsScreenState
               ),
               _MetadataRow(
                 label: context.l10n.extensionMinAppVersion,
-                value: ext.minAppVersion ?? 'Any',
+                value: ext.minAppVersion ?? context.l10n.storeAnyVersion,
                 colorScheme: colorScheme,
                 isLast: true,
               ),
@@ -496,18 +496,18 @@ class _ExtensionDetailsScreenState
     }
   }
 
-  String _getCategoryName(String category) {
+  String _getCategoryName(BuildContext context, String category) {
     switch (category) {
       case 'metadata':
-        return 'Metadata';
+        return context.l10n.storeCategoryMetadata;
       case 'download':
-        return 'Download';
+        return context.l10n.storeCategoryDownload;
       case 'utility':
-        return 'Utility';
+        return context.l10n.storeCategoryUtility;
       case 'lyrics':
-        return 'Lyrics';
+        return context.l10n.storeCategoryLyrics;
       case 'integration':
-        return 'Integration';
+        return context.l10n.storeCategoryIntegration;
       default:
         return category;
     }

lib/screens/track_metadata_edit_sheet.dart

@@ -265,11 +265,11 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
       case 'track_number':
         return l10n.editMetadataFieldTrackNum;
       case 'total_tracks':
-        return 'Track Total';
+        return l10n.editMetadataFieldTrackTotal;
       case 'disc_number':
         return l10n.editMetadataFieldDiscNum;
       case 'total_discs':
-        return 'Disc Total';
+        return l10n.editMetadataFieldDiscTotal;
       case 'genre':
         return l10n.editMetadataFieldGenre;
       case 'isrc':
@@ -281,7 +281,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
       case 'copyright':
         return l10n.editMetadataFieldCopyright;
       case 'composer':
-        return 'Composer';
+        return l10n.editMetadataFieldComposer;
       case 'cover':
         return l10n.editMetadataFieldCover;
       default:
@@ -1224,16 +1224,23 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                   const SizedBox(height: 6),
                   _buildCoverEditor(cs),
                   _buildAutoFillSection(cs),
-                  _field('Title', _titleCtrl),
-                  _field('Artist', _artistCtrl),
-                  _field('Album', _albumCtrl),
-                  _field('Album Artist', _albumArtistCtrl),
-                  _field('Date', _dateCtrl, hint: 'YYYY-MM-DD or YYYY'),
+                  _field(context.l10n.editMetadataFieldTitle, _titleCtrl),
+                  _field(context.l10n.editMetadataFieldArtist, _artistCtrl),
+                  _field(context.l10n.editMetadataFieldAlbum, _albumCtrl),
+                  _field(
+                    context.l10n.editMetadataFieldAlbumArtist,
+                    _albumArtistCtrl,
+                  ),
+                  _field(
+                    context.l10n.editMetadataFieldDate,
+                    _dateCtrl,
+                    hint: context.l10n.editMetadataFieldDateHint,
+                  ),
                   Row(
                     children: [
                       Expanded(
                         child: _field(
-                          'Track #',
+                          context.l10n.editMetadataFieldTrackNum,
                           _trackNumCtrl,
                           keyboard: TextInputType.number,
                         ),
@@ -1241,7 +1248,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                       const SizedBox(width: 12),
                       Expanded(
                         child: _field(
-                          'Track Total',
+                          context.l10n.editMetadataFieldTrackTotal,
                           _trackTotalCtrl,
                           keyboard: TextInputType.number,
                         ),
@@ -1253,7 +1260,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                     children: [
                       Expanded(
                         child: _field(
-                          'Disc #',
+                          context.l10n.editMetadataFieldDiscNum,
                           _discNumCtrl,
                           keyboard: TextInputType.number,
                         ),
@@ -1261,15 +1268,15 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                       const SizedBox(width: 12),
                       Expanded(
                         child: _field(
-                          'Disc Total',
+                          context.l10n.editMetadataFieldDiscTotal,
                           _discTotalCtrl,
                           keyboard: TextInputType.number,
                         ),
                       ),
                     ],
                   ),
-                  _field('Genre', _genreCtrl),
-                  _field('ISRC', _isrcCtrl),
+                  _field(context.l10n.editMetadataFieldGenre, _genreCtrl),
+                  _field(context.l10n.editMetadataFieldIsrc, _isrcCtrl),
                   _field(
                     context.l10n.trackLyrics,
                     _lyricsCtrl,
@@ -1295,7 +1302,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                             ),
                             const SizedBox(width: 8),
                             Text(
-                              'Advanced',
+                              context.l10n.editMetadataAdvanced,
                               style: Theme.of(context).textTheme.labelLarge
                                   ?.copyWith(color: cs.onSurfaceVariant),
                             ),
@@ -1305,10 +1312,20 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
                     ),
                   ),
                   if (_showAdvanced) ...[
-                    _field('Label', _labelCtrl),
-                    _field('Copyright', _copyrightCtrl),
-                    _field('Composer', _composerCtrl),
-                    _field('Comment', _commentCtrl, maxLines: 3),
+                    _field(context.l10n.editMetadataFieldLabel, _labelCtrl),
+                    _field(
+                      context.l10n.editMetadataFieldCopyright,
+                      _copyrightCtrl,
+                    ),
+                    _field(
+                      context.l10n.editMetadataFieldComposer,
+                      _composerCtrl,
+                    ),
+                    _field(
+                      context.l10n.editMetadataFieldComment,
+                      _commentCtrl,
+                      maxLines: 3,
+                    ),
                   ],
                   const SizedBox(height: 24),
                 ],
@@ -1501,7 +1518,7 @@ class _EditMetadataSheetState extends State<_EditMetadataSheet> {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             Text(
-              'Cover Art',
+              context.l10n.editMetadataFieldCover,
               style: Theme.of(
                 context,
               ).textTheme.labelLarge?.copyWith(color: cs.onSurface),

lib/screens/track_metadata_screen.dart

@@ -17,11 +17,13 @@ import 'package:spotiflac_android/providers/settings_provider.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/services/ffmpeg_service.dart';
 import 'package:spotiflac_android/l10n/l10n.dart';
+import 'package:spotiflac_android/utils/audio_conversion_utils.dart';
 import 'package:spotiflac_android/utils/logger.dart';
 import 'package:spotiflac_android/utils/lyrics_metadata_helper.dart';
 import 'package:spotiflac_android/utils/mime_utils.dart';
 import 'package:spotiflac_android/utils/image_cache_utils.dart';
 import 'package:spotiflac_android/utils/string_utils.dart';
+import 'package:spotiflac_android/utils/int_utils.dart';
 import 'package:spotiflac_android/widgets/audio_analysis_widget.dart';
 import 'package:spotiflac_android/widgets/cached_cover_image.dart';
 
@@ -365,13 +367,23 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         return;
       }
 
-      final resolvedBitDepth = _readPositiveInt(metadata['bit_depth']);
-      final resolvedSampleRate = _readPositiveInt(metadata['sample_rate']);
-      final resolvedDuration = _readPositiveInt(metadata['duration']);
+      final resolvedBitDepth = readPositiveInt(metadata['bit_depth']);
+      final resolvedSampleRate = readPositiveInt(metadata['sample_rate']);
+      final resolvedFormat = _normalizeAudioFormatValue(
+        metadata['audio_codec']?.toString() ?? metadata['format']?.toString(),
+      );
+      final resolvedBitrate = _isBitrateFormatValue(resolvedFormat)
+          ? _readPlausibleBitrateKbps(
+              metadata['bitrate'] ?? metadata['bit_rate'],
+            )
+          : null;
+      final resolvedDuration = readPositiveInt(metadata['duration']);
       final resolvedAlbum = metadata['album']?.toString();
-      final resolvedQuality = buildDisplayAudioQuality(
+      final resolvedQuality = _displayQualityForValues(
+        format: resolvedFormat ?? _storedAudioFormat,
         bitDepth: resolvedBitDepth ?? bitDepth,
         sampleRate: resolvedSampleRate ?? sampleRate,
+        bitrateKbps: resolvedBitrate ?? _audioBitrate,
         storedQuality: _quality,
       );
 
@@ -386,10 +398,10 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
 
       // Resolve label/copyright from file when the model doesn't carry them
       // (e.g. local library items, or download history items without these fields).
-      final resolvedTrackNumber = _readPositiveInt(metadata['track_number']);
-      final resolvedTotalTracks = _readPositiveInt(metadata['total_tracks']);
-      final resolvedDiscNumber = _readPositiveInt(metadata['disc_number']);
-      final resolvedTotalDiscs = _readPositiveInt(metadata['total_discs']);
+      final resolvedTrackNumber = readPositiveInt(metadata['track_number']);
+      final resolvedTotalTracks = readPositiveInt(metadata['total_tracks']);
+      final resolvedDiscNumber = readPositiveInt(metadata['disc_number']);
+      final resolvedTotalDiscs = readPositiveInt(metadata['total_discs']);
       final resolvedComposer = metadata['composer']?.toString();
       final resolvedLabel = metadata['label']?.toString();
       final resolvedCopyright = metadata['copyright']?.toString();
@@ -426,6 +438,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
           !_isLocalItem &&
           (resolvedBitDepth != null ||
               resolvedSampleRate != null ||
+              resolvedBitrate != null ||
+              resolvedFormat != null ||
               needsTrackNumber ||
               needsTotalTracks ||
               needsDiscNumber ||
@@ -475,6 +489,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
               quality: resolvedQuality,
               bitDepth: resolvedBitDepth,
               sampleRate: resolvedSampleRate,
+              bitrate: resolvedBitrate,
+              format: resolvedFormat,
               trackNumber: needsTrackNumber ? resolvedTrackNumber : null,
               totalTracks: needsTotalTracks ? resolvedTotalTracks : null,
               discNumber: needsDiscNumber ? resolvedDiscNumber : null,
@@ -482,6 +498,23 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
               duration: needsDuration ? resolvedDuration : null,
               composer: needsComposer ? resolvedComposer : null,
             );
+        if (mounted && _downloadItem != null) {
+          setState(() {
+            _currentDownloadItem = _downloadItem!.copyWith(
+              quality: resolvedQuality,
+              bitDepth: resolvedBitDepth,
+              sampleRate: resolvedSampleRate,
+              bitrate: resolvedBitrate,
+              format: resolvedFormat,
+              trackNumber: needsTrackNumber ? resolvedTrackNumber : null,
+              totalTracks: needsTotalTracks ? resolvedTotalTracks : null,
+              discNumber: needsDiscNumber ? resolvedDiscNumber : null,
+              totalDiscs: needsTotalDiscs ? resolvedTotalDiscs : null,
+              duration: needsDuration ? resolvedDuration : null,
+              composer: needsComposer ? resolvedComposer : null,
+            );
+          });
+        }
       } else if (_isLocalItem && needsDuration) {
         await LibraryDatabase.instance.updateAudioMetadata(
           _localLibraryItem!.id,
@@ -614,7 +647,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   }
 
   int? get totalTracks =>
-      _readPositiveInt(_editedMetadata?['total_tracks']) ??
+      readPositiveInt(_editedMetadata?['total_tracks']) ??
       (_isLocalItem
           ? _localLibraryItem!.totalTracks
           : _downloadItem!.totalTracks);
@@ -631,7 +664,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   }
 
   int? get totalDiscs =>
-      _readPositiveInt(_editedMetadata?['total_discs']) ??
+      readPositiveInt(_editedMetadata?['total_discs']) ??
       (_isLocalItem
           ? _localLibraryItem!.totalDiscs
           : _downloadItem!.totalDiscs);
@@ -670,17 +703,20 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       _editedMetadata?['composer']?.toString() ??
       (_isLocalItem ? _localLibraryItem!.composer : null);
   int? get duration =>
-      _readPositiveInt(_editedMetadata?['duration']) ??
+      readPositiveInt(_editedMetadata?['duration']) ??
       (_isLocalItem ? _localLibraryItem!.duration : _downloadItem!.duration);
   int? get bitDepth =>
-      _readPositiveInt(_editedMetadata?['bit_depth']) ??
+      readPositiveInt(_editedMetadata?['bit_depth']) ??
       (_isLocalItem ? _localLibraryItem!.bitDepth : _downloadItem!.bitDepth);
   int? get sampleRate =>
-      _readPositiveInt(_editedMetadata?['sample_rate']) ??
+      readPositiveInt(_editedMetadata?['sample_rate']) ??
       (_isLocalItem
           ? _localLibraryItem!.sampleRate
           : _downloadItem!.sampleRate);
-  int? get _localBitrate => _isLocalItem ? _localLibraryItem!.bitrate : null;
+  int? get _audioBitrate =>
+      _isLocalItem ? _localLibraryItem!.bitrate : _downloadItem?.bitrate;
+  String? get _storedAudioFormat =>
+      _isLocalItem ? _localLibraryItem?.format : _downloadItem?.format;
 
   String get _filePath =>
       _isLocalItem ? _localLibraryItem!.filePath : _downloadItem!.filePath;
@@ -706,15 +742,83 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
 
   String? get _quality => _isLocalItem ? null : _downloadItem!.quality;
 
-  int? _readPositiveInt(dynamic value) {
-    if (value == null) return null;
-    if (value is num) {
-      final asInt = value.toInt();
-      return asInt > 0 ? asInt : null;
+  String? _normalizeAudioFormatValue(String? value) {
+    final normalized = normalizeOptionalString(
+      value,
+    )?.toLowerCase().replaceAll('-', '_');
+    return switch (normalized) {
+      'flac' => 'flac',
+      'alac' => 'alac',
+      'aac' || 'mp4a' => 'aac',
+      'eac3' || 'ec_3' => 'eac3',
+      'ac3' || 'ac_3' => 'ac3',
+      'ac4' || 'ac_4' => 'ac4',
+      'mp3' => 'mp3',
+      'opus' || 'ogg' => 'opus',
+      'm4a' || 'mp4' => 'm4a',
+      _ => null,
+    };
+  }
+
+  int? _readPlausibleBitrateKbps(dynamic value) {
+    final parsed = readPositiveInt(value);
+    if (parsed == null) return null;
+    final kbps = parsed >= 10000 ? (parsed / 1000).round() : parsed;
+    return kbps >= 16 ? kbps : null;
+  }
+
+  bool _isBitrateFormatValue(String? value) {
+    return const {
+      'aac',
+      'eac3',
+      'ac3',
+      'ac4',
+      'mp3',
+      'opus',
+      'm4a',
+    }.contains(_normalizeAudioFormatValue(value));
+  }
+
+  String? _usableStoredQuality(String? quality) {
+    final normalized = normalizeOptionalString(quality);
+    if (normalized == null || isPlaceholderQualityLabel(normalized)) {
+      return null;
     }
-    final parsed = int.tryParse(value.toString());
-    if (parsed == null || parsed <= 0) return null;
-    return parsed;
+    final bitrateMatch = RegExp(
+      r'\b(\d+)\s*kbps\b',
+      caseSensitive: false,
+    ).firstMatch(normalized);
+    if (bitrateMatch != null) {
+      final bitrate = int.tryParse(bitrateMatch.group(1) ?? '');
+      if (bitrate != null && bitrate < 16) return null;
+    }
+    return normalized;
+  }
+
+  String? _displayQualityForValues({
+    required String? format,
+    int? bitDepth,
+    int? sampleRate,
+    int? bitrateKbps,
+    String? storedQuality,
+  }) {
+    final normalizedFormat = _normalizeAudioFormatValue(format);
+    final formatLabel = normalizedFormat == null
+        ? normalizeOptionalString(format)?.toUpperCase()
+        : _formatLabelForRaw(normalizedFormat);
+    if (_isBitrateFormatValue(normalizedFormat)) {
+      return buildDisplayAudioQuality(
+            bitrateKbps: bitrateKbps,
+            format: formatLabel,
+          ) ??
+          _usableStoredQuality(storedQuality) ??
+          formatLabel;
+    }
+    return buildDisplayAudioQuality(
+      bitDepth: bitDepth,
+      sampleRate: sampleRate,
+      storedQuality: _usableStoredQuality(storedQuality),
+    );
   }
 
   String _displayServiceTrackId(String value) {
@@ -776,11 +880,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         ? fileName.split('.').last.toUpperCase()
         : null;
 
-    return buildDisplayAudioQuality(
+    return _displayQualityForValues(
+      format: _storedAudioFormat ?? fileExt,
       bitDepth: bitDepth,
       sampleRate: sampleRate,
-      bitrateKbps: _isLocalItem ? _localBitrate : null,
-      format: _isLocalItem ? (_localLibraryItem!.format ?? fileExt) : fileExt,
+      bitrateKbps: _audioBitrate,
       storedQuality: _quality,
     );
   }
@@ -1311,8 +1415,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                               color: Colors.white,
                             ),
                             const SizedBox(width: 4),
-                            const Text(
-                              'Local',
+                            Text(
+                              context.l10n.librarySourceLocal,
                               style: TextStyle(
                                 color: Colors.white,
                                 fontWeight: FontWeight.w600,
@@ -1405,11 +1509,13 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                   if (openService == 'deezer') {
                     buttonLabel = context.l10n.trackOpenInDeezer;
                   } else if (openService == 'amazon') {
-                    buttonLabel = 'Open in Amazon Music';
+                    buttonLabel = context.l10n.trackOpenInService(
+                      'Amazon Music',
+                    );
                   } else if (openService == 'tidal') {
-                    buttonLabel = 'Open in Tidal';
+                    buttonLabel = context.l10n.trackOpenInService('Tidal');
                   } else if (openService == 'qobuz') {
-                    buttonLabel = 'Open in Qobuz';
+                    buttonLabel = context.l10n.trackOpenInService('Qobuz');
                   } else {
                     buttonLabel = context.l10n.trackOpenInSpotify;
                   }
@@ -1514,11 +1620,17 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       if (trackNumber != null && trackNumber! > 0)
         _MetadataItem(context.l10n.trackTrackNumber, trackNumber.toString()),
       if (totalTracks != null && totalTracks! > 0)
-        _MetadataItem('Track Total', totalTracks.toString()),
+        _MetadataItem(
+          context.l10n.editMetadataFieldTrackTotal,
+          totalTracks.toString(),
+        ),
       if (discNumber != null && discNumber! > 0)
         _MetadataItem(context.l10n.trackDiscNumber, discNumber.toString()),
       if (totalDiscs != null && totalDiscs! > 0)
-        _MetadataItem('Disc Total', totalDiscs.toString()),
+        _MetadataItem(
+          context.l10n.editMetadataFieldDiscTotal,
+          totalDiscs.toString(),
+        ),
       if (duration != null)
         _MetadataItem(context.l10n.trackDuration, _formatDuration(duration!)),
       if (audioQualityStr != null)
@@ -1532,7 +1644,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
       if (copyright != null && copyright!.isNotEmpty)
         _MetadataItem(context.l10n.trackCopyright, copyright!),
       if (composer != null && composer!.isNotEmpty)
-        _MetadataItem('Composer', composer!),
+        _MetadataItem(context.l10n.editMetadataFieldComposer, composer!),
       if (isrc != null && isrc!.isNotEmpty) _MetadataItem('ISRC', isrc!),
     ];
 
@@ -1621,6 +1733,44 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     return '$minutes:${secs.toString().padLeft(2, '0')}';
   }
 
+  String _formatLabelForRaw(String raw) {
+    final normalized = raw.toLowerCase().replaceAll('-', '_');
+    return switch (normalized) {
+      'flac' => 'FLAC',
+      'alac' => 'ALAC',
+      'eac3' || 'ec_3' => 'EAC3',
+      'ac3' || 'ac_3' => 'AC3',
+      'ac4' || 'ac_4' => 'AC4',
+      'aac' || 'mp4a' => 'AAC',
+      'm4a' || 'mp4' => 'M4A',
+      'mp3' => 'MP3',
+      'opus' => 'Opus',
+      'ogg' => 'OGG',
+      _ => raw.toUpperCase(),
+    };
+  }
+
+  String _displayFormatLabelForFile(String fileName) {
+    final storedFormat = normalizeOptionalString(_storedAudioFormat);
+    final raw =
+        storedFormat ??
+        (fileName.contains('.') ? fileName.split('.').last : 'Unknown');
+    return _formatLabelForRaw(raw);
+  }
+
+  bool _isBitrateFormatLabel(String label) {
+    return const {
+      'MP3',
+      'OPUS',
+      'OGG',
+      'M4A',
+      'AAC',
+      'EAC3',
+      'AC3',
+      'AC4',
+    }.contains(label.toUpperCase());
+  }
+
   Widget _buildFileInfoCard(
     BuildContext context,
     ColorScheme colorScheme,
@@ -1629,9 +1779,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
   ) {
     final displayFilePath = _formatPathForDisplay(rawFilePath);
     final fileName = _extractFileNameFromPathOrUri(rawFilePath);
-    final fileExtension = fileName.contains('.')
-        ? fileName.split('.').last.toUpperCase()
-        : 'Unknown';
+    final fileExtension = _displayFormatLabelForFile(fileName);
     final resolvedQuality = _displayAudioQuality;
     final lossyBitrateLabel = _extractLossyBitrateLabel(resolvedQuality);
 
@@ -1704,9 +1852,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                       ),
                     ),
                   ),
-                if ((fileExtension == 'MP3' ||
-                        fileExtension == 'OPUS' ||
-                        fileExtension == 'OGG') &&
+                if (_isBitrateFormatLabel(fileExtension) &&
                     lossyBitrateLabel != null)
                   Container(
                     padding: const EdgeInsets.symmetric(
@@ -1726,12 +1872,9 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                       ),
                     ),
                   )
-                else if (_isLocalItem &&
-                    _localBitrate != null &&
-                    _localBitrate! > 0 &&
-                    (fileExtension == 'MP3' ||
-                        fileExtension == 'OPUS' ||
-                        fileExtension == 'OGG'))
+                else if (_audioBitrate != null &&
+                    _audioBitrate! > 0 &&
+                    _isBitrateFormatLabel(fileExtension))
                   Container(
                     padding: const EdgeInsets.symmetric(
                       horizontal: 12,
@@ -1742,7 +1885,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                       borderRadius: BorderRadius.circular(20),
                     ),
                     child: Text(
-                      '${_localBitrate}kbps',
+                      '${_audioBitrate}kbps',
                       style: TextStyle(
                         color: colorScheme.onTertiaryContainer,
                         fontWeight: FontWeight.w600,
@@ -1885,7 +2028,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
               Padding(
                 padding: const EdgeInsets.only(top: 4),
                 child: Text(
-                  'Source: ${_lyricsSource!}',
+                  context.l10n.trackLyricsSource(_lyricsSource!),
                   style: Theme.of(context).textTheme.bodySmall?.copyWith(
                     color: colorScheme.onSurfaceVariant,
                   ),
@@ -2085,7 +2228,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             _rawLyrics = embeddedLyrics;
             _lyricsSource = embeddedSource.isNotEmpty
                 ? embeddedSource
-                : 'Embedded';
+                : context.l10n.trackLyricsEmbeddedSource;
             _lyricsEmbedded = true;
             _lyricsLoading = false;
             _embeddedLyricsChecked = true;
@@ -2216,7 +2359,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
               _rawLyrics = embeddedLyrics;
               _lyricsSource = embeddedSource.isNotEmpty
                   ? embeddedSource
-                  : 'Embedded';
+                  : context.l10n.trackLyricsEmbeddedSource;
               _lyricsEmbedded = true;
               _lyricsLoading = false;
               _embeddedLyricsChecked = true;
@@ -3233,6 +3376,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     final lower = cleanFilePath.toLowerCase();
     return lower.endsWith('.flac') ||
         lower.endsWith('.m4a') ||
+        lower.endsWith('.aac') ||
         lower.endsWith('.mp3') ||
         lower.endsWith('.opus') ||
         lower.endsWith('.ogg');
@@ -3259,9 +3403,31 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         return 'CUE+$audioFmt';
       }
     }
+    if (_isLocalItem && _localLibraryItem != null) {
+      final format = normalizeOptionalString(
+        _localLibraryItem!.format,
+      )?.toLowerCase().replaceAll('-', '_');
+      switch (format) {
+        case 'flac':
+          return 'FLAC';
+        case 'alac':
+          return 'ALAC';
+        case 'm4a':
+          return 'M4A';
+        case 'aac':
+        case 'mp4a':
+          return 'AAC';
+        case 'mp3':
+          return 'MP3';
+        case 'opus':
+        case 'ogg':
+          return 'Opus';
+      }
+    }
     final lower = cleanFilePath.toLowerCase();
     if (lower.endsWith('.flac')) return 'FLAC';
     if (lower.endsWith('.m4a')) return 'M4A';
+    if (lower.endsWith('.aac')) return 'AAC';
     if (lower.endsWith('.mp3')) return 'MP3';
     if (lower.endsWith('.opus') || lower.endsWith('.ogg')) return 'Opus';
     if (lower.endsWith('.cue')) return 'CUE';
@@ -3394,19 +3560,29 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
 
     final formats = <String>[];
     if (currentFormat == 'FLAC') {
-      formats.addAll(['ALAC', 'MP3', 'Opus']);
+      formats.addAll(['ALAC', 'AAC', 'MP3', 'Opus']);
+    } else if (currentFormat == 'ALAC') {
+      formats.addAll(['FLAC', 'AAC', 'MP3', 'Opus']);
     } else if (currentFormat == 'M4A') {
-      formats.addAll(['FLAC', 'MP3', 'Opus']);
-    } else if (currentFormat == 'MP3') {
-      formats.add('Opus');
-    } else if (currentFormat == 'Opus') {
-      formats.add('MP3');
-    } else {
+      formats.addAll(['ALAC', 'FLAC', 'AAC', 'MP3', 'Opus']);
+    } else if (currentFormat == 'AAC') {
       formats.addAll(['MP3', 'Opus']);
+    } else if (currentFormat == 'MP3') {
+      formats.addAll(['AAC', 'Opus']);
+    } else if (currentFormat == 'Opus') {
+      formats.addAll(['AAC', 'MP3']);
+    } else {
+      formats.addAll(['AAC', 'MP3', 'Opus']);
     }
 
     String selectedFormat = formats.first;
-    String selectedBitrate = selectedFormat == 'Opus' ? '128k' : '320k';
+    String defaultBitrateForFormat(String format) {
+      if (format == 'Opus') return '128k';
+      if (format == 'AAC') return '256k';
+      return '320k';
+    }
+
+    String selectedBitrate = defaultBitrateForFormat(selectedFormat);
     bool isLosslessTarget =
         selectedFormat == 'ALAC' || selectedFormat == 'FLAC';
 
@@ -3471,9 +3647,9 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                                 isLosslessTarget =
                                     format == 'ALAC' || format == 'FLAC';
                                 if (!isLosslessTarget) {
-                                  selectedBitrate = format == 'Opus'
-                                      ? '128k'
-                                      : '320k';
+                                  selectedBitrate = defaultBitrateForFormat(
+                                    format,
+                                  );
                                 }
                               });
                             }
@@ -3566,6 +3742,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
 
   void _showCueSplitSheet(BuildContext context) async {
     var cuePath = cleanFilePath;
+    final unknownAlbum = context.l10n.unknownAlbum;
+    final unknownArtist = context.l10n.unknownArtist;
     final trackSuffix = RegExp(r'#track\d+$');
     if (trackSuffix.hasMatch(cuePath)) {
       cuePath = cuePath.replaceFirst(trackSuffix, '');
@@ -3586,8 +3764,8 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
         return;
       }
 
-      final album = cueInfo['album'] as String? ?? 'Unknown Album';
-      final artist = cueInfo['artist'] as String? ?? 'Unknown Artist';
+      final album = cueInfo['album'] as String? ?? unknownAlbum;
+      final artist = cueInfo['artist'] as String? ?? unknownArtist;
       final audioPath = cueInfo['audio_path'] as String? ?? '';
       final genre = cueInfo['genre'] as String? ?? '';
       final date = cueInfo['date'] as String? ?? '';
@@ -4236,6 +4414,10 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             newExt = '.opus';
             mimeType = 'audio/opus';
             break;
+          case 'aac':
+            newExt = '.m4a';
+            mimeType = 'audio/mp4';
+            break;
           case 'alac':
             newExt = '.m4a';
             mimeType = 'audio/mp4';
@@ -4277,11 +4459,15 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
           return;
         }
 
-        final deletedOriginal = await PlatformBridge.safDelete(
-          cleanFilePath,
-        ).catchError((_) => false);
-        if (deletedOriginal != true) {
-          _log.w('Converted SAF file created but failed deleting original URI');
+        if (!isSameContentUri(cleanFilePath, safUri)) {
+          final deletedOriginal = await PlatformBridge.safDelete(
+            cleanFilePath,
+          ).catchError((_) => false);
+          if (deletedOriginal != true) {
+            _log.w(
+              'Converted SAF file created but failed deleting original URI',
+            );
+          }
         }
 
         if (!_isLocalItem) {
@@ -4290,6 +4476,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             safUri,
             newSafFileName: newFileName,
             newQuality: newQuality,
+            newFormat: normalizedConvertedAudioFormat(targetFormat),
+            newBitrate: convertedAudioBitrateKbps(
+              targetFormat: targetFormat,
+              bitrate: bitrate,
+            ),
             clearAudioSpecs: true,
           );
           await ref.read(downloadHistoryProvider.notifier).reloadFromStorage();
@@ -4317,6 +4508,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
             _downloadItem!.id,
             newPath,
             newQuality: newQuality,
+            newFormat: normalizedConvertedAudioFormat(targetFormat),
+            newBitrate: convertedAudioBitrateKbps(
+              targetFormat: targetFormat,
+              bitrate: bitrate,
+            ),
             clearAudioSpecs: true,
           );
           await ref.read(downloadHistoryProvider.notifier).reloadFromStorage();
@@ -4394,7 +4590,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
     };
 
     final initialDurationSeconds =
-        _readPositiveInt(fileMetadata?['duration']) ?? duration ?? 0;
+        readPositiveInt(fileMetadata?['duration']) ?? duration ?? 0;
 
     if (!context.mounted) return;
 
@@ -4433,7 +4629,7 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
           if (refreshedLyrics.isNotEmpty) {
             _lyrics = _cleanLrcForDisplay(refreshedLyrics);
             _rawLyrics = refreshedLyrics;
-            _lyricsSource = 'Embedded';
+            _lyricsSource = context.l10n.trackLyricsEmbeddedSource;
             _lyricsEmbedded = true;
           } else {
             _lyrics = null;