feat(player): add Mornye media notification controls

Sync notification favorites with Library, add Mornye transport icons and an output action on legacy Android, and expose the iOS favorite command. Preserve playback position when controls refresh.

Vendor audio_service 0.18.19 with a small Android patch for custom notification actions. Modern Android keeps its system output switcher and transport layout.

android/app/src/main/AndroidManifest.xml

@@ -35,6 +35,11 @@
         android:networkSecurityConfig="@xml/network_security_config"
         android:enableOnBackInvokedCallback="true"
         android:localeConfig="@xml/locale_config">
+        <activity
+            android:name=".AudioOutputActivity"
+            android:exported="false"
+            android:excludeFromRecents="true"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar" />
         <activity
             android:name=".MainActivity"
             android:exported="true"

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

@@ -0,0 +1,39 @@
+package com.zarz.spotiflac
+
+import android.app.Activity
+import android.content.Intent
+import android.media.MediaRouter2
+import android.os.Build
+import android.provider.Settings
+
+/** A notification launches this activity directly, so output selection has a
+ * visible foreground context even while the Flutter player is in the background.
+ */
+class AudioOutputActivity : Activity() {
+    private var opened = false
+    private var pickerTookFocus = false
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (!hasFocus) {
+            if (opened) pickerTookFocus = true
+            return
+        }
+        if (opened) {
+            if (pickerTookFocus) finish()
+            return
+        }
+        opened = true
+        try {
+            if (Build.VERSION.SDK_INT >= 34 &&
+                MediaRouter2.getInstance(this).showSystemOutputSwitcher()) {
+                return
+            }
+            // Public output-switcher API is unavailable on older Android.
+            startActivity(Intent(Settings.ACTION_BLUETOOTH_SETTINGS))
+        } catch (_: Exception) {
+            // Do not leave a transparent activity over the notification shade.
+        }
+        finish()
+    }
+}

android/app/src/main/res/drawable/ic_notification_airplay.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="#00000000" android:strokeColor="#FFFFFF"
+        android:strokeWidth="1.65" android:strokeLineCap="round"
+        android:pathData="M5.3,17.2 A9,9 0,1 1,18.7 17.2 M7.6,14.8 A5.8,5.8 0,1 1,16.4 14.8 M9.8,12.4 A2.65,2.65 0,1 1,14.2 12.4" />
+    <path android:fillColor="#FFFFFF"
+        android:pathData="M12,12.8 L17,21.5 L7,21.5 Z" />
+</vector>

android/app/src/main/res/drawable/ic_notification_star.xml

@@ -0,0 +1,7 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="#00000000" android:strokeColor="#FFFFFF"
+        android:strokeWidth="1.7" android:strokeLineJoin="round"
+        android:pathData="M12,2.5 L14.85,8.6 L21.5,9.4 L16.6,14 L17.9,20.7 L12,17.3 L6.1,20.7 L7.4,14 L2.5,9.4 L9.15,8.6 Z" />
+</vector>

android/app/src/main/res/drawable/ic_notification_star_filled.xml

@@ -0,0 +1,6 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path android:fillColor="#FFFFFF"
+        android:pathData="M12,2.5 L14.85,8.6 L21.5,9.4 L16.6,14 L17.9,20.7 L12,17.3 L6.1,20.7 L7.4,14 L2.5,9.4 L9.15,8.6 Z" />
+</vector>

android/app/src/main/res/raw/notification_keep.xml

@@ -0,0 +1,2 @@
+<resources xmlns:tools="http://schemas.android.com/tools"
+    tools:keep="@drawable/ic_notification_*,@drawable/ic_widget_previous,@drawable/ic_widget_next,@drawable/ic_widget_play,@drawable/ic_widget_pause" />