fix(download): complete quality variants reliably

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

@@ -157,6 +157,24 @@ internal object NativeFinalizationPolicy {
         return "$stem - $qualityLabel$extension"
     }
 
+    /**
+     * Returns the user-facing name that a deferred SAF download was assigned
+     * before its audio was materialized in the app cache. Container and
+     * decryption passes may replace [currentFileName] with a temporary
+     * `native_saf_work_*` name, which must never become the published name.
+     */
+    fun logicalOutputFileName(
+        deferredSafPublish: Boolean,
+        resultSafFileName: String?,
+        requestSafFileName: String?,
+        currentFileName: String,
+    ): String {
+        if (!deferredSafPublish) return currentFileName
+        return normalizeOptional(resultSafFileName)
+            ?: normalizeOptional(requestSafFileName)
+            ?: currentFileName
+    }
+
     fun resolvePreferredDecryptionExtension(
         inputPath: String,
         requested: String,

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

@@ -20,6 +20,7 @@ import com.zarz.spotiflac.NativeFinalizationPolicy.displayAudioQuality
 import com.zarz.spotiflac.NativeFinalizationPolicy.formatIndexTag
 import com.zarz.spotiflac.NativeFinalizationPolicy.isLosslessAudioCodec
 import com.zarz.spotiflac.NativeFinalizationPolicy.isLossyAudioCodec
+import com.zarz.spotiflac.NativeFinalizationPolicy.logicalOutputFileName
 import com.zarz.spotiflac.NativeFinalizationPolicy.normalizeAudioCodec
 import com.zarz.spotiflac.NativeFinalizationPolicy.resolvePreferredDecryptionExtension
 import gobackend.Gobackend
@@ -61,12 +62,18 @@ internal fun NativeDownloadFinalizer.finalizeQualityVariantFilename(
         return
     }
 
+    val logicalFileName = logicalOutputFileName(
+        deferredSafPublish = isDeferredSafPublish(input),
+        resultSafFileName = input.result.optString("saf_final_file_name", ""),
+        requestSafFileName = input.request.optString("saf_file_name", ""),
+        currentFileName = state.fileName,
+    )
     val preferredName = applyQualityVariantFilenameLabel(
-        fileName = state.fileName,
+        fileName = logicalFileName,
         stagingLabel = stagingLabel,
         qualityLabel = qualityLabel,
     )
-    if (preferredName == state.fileName) return
+    if (preferredName == logicalFileName && preferredName == state.fileName) return
     input.result.put("quality_variant_file_name", preferredName)
     if (isDeferredSafPublish(input)) {
         state.fileName = preferredName