refactor: migrate to riverpod 3

lib/features/chat/providers/text_to_speech_provider.dart

@@ -49,21 +49,32 @@ class TextToSpeechState {
   }
 }
 
-class TextToSpeechController extends StateNotifier<TextToSpeechState> {
-  TextToSpeechController(this._service) : super(const TextToSpeechState()) {
-    _service.bindHandlers(
-      onStart: _handleStart,
-      onComplete: _handleCompletion,
-      onCancel: _handleCancellation,
-      onPause: _handlePause,
-      onContinue: _handleContinue,
-      onError: _handleError,
-    );
-  }
-
-  final TextToSpeechService _service;
+class TextToSpeechController extends Notifier<TextToSpeechState> {
+  late final TextToSpeechService _service;
+  bool _handlersBound = false;
   Future<bool>? _initializationFuture;
 
+  @override
+  TextToSpeechState build() {
+    _service = ref.watch(textToSpeechServiceProvider);
+    if (!_handlersBound) {
+      _handlersBound = true;
+      _service.bindHandlers(
+        onStart: _handleStart,
+        onComplete: _handleCompletion,
+        onCancel: _handleCancellation,
+        onPause: _handlePause,
+        onContinue: _handleContinue,
+        onError: _handleError,
+      );
+
+      ref.onDispose(() {
+        unawaited(_service.stop());
+      });
+    }
+    return const TextToSpeechState();
+  }
+
   Future<bool> _ensureInitialized() {
     final existing = _initializationFuture;
     if (existing != null) {
@@ -78,7 +89,7 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
     final future = _service
         .initialize()
         .then((available) {
-          if (!mounted) {
+          if (!ref.mounted) {
             return available;
           }
 
@@ -90,7 +101,7 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
           return available;
         })
         .catchError((error, _) {
-          if (!mounted) {
+          if (!ref.mounted) {
             return false;
           }
 
@@ -132,7 +143,7 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
 
     final available = await _ensureInitialized();
     if (!available) {
-      if (!mounted) {
+      if (!ref.mounted) {
         return;
       }
       state = state.copyWith(
@@ -151,14 +162,14 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
 
     try {
       await _service.speak(text);
-      if (!mounted) {
+      if (!ref.mounted) {
         return;
       }
       if (state.status == TtsPlaybackStatus.loading) {
         state = state.copyWith(status: TtsPlaybackStatus.speaking);
       }
     } catch (e) {
-      if (!mounted) {
+      if (!ref.mounted) {
         return;
       }
       state = state.copyWith(
@@ -178,7 +189,7 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
 
   Future<void> stop() async {
     await _service.stop();
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(
@@ -189,14 +200,14 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
   }
 
   void _handleStart() {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(status: TtsPlaybackStatus.speaking);
   }
 
   void _handleCompletion() {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(
@@ -206,7 +217,7 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
   }
 
   void _handleCancellation() {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(
@@ -216,21 +227,21 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
   }
 
   void _handlePause() {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(status: TtsPlaybackStatus.paused);
   }
 
   void _handleContinue() {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(status: TtsPlaybackStatus.speaking);
   }
 
   void _handleError(String message) {
-    if (!mounted) {
+    if (!ref.mounted) {
       return;
     }
     state = state.copyWith(
@@ -239,12 +250,6 @@ class TextToSpeechController extends StateNotifier<TextToSpeechState> {
       clearActiveMessageId: true,
     );
   }
-
-  @override
-  void dispose() {
-    unawaited(_service.stop());
-    super.dispose();
-  }
 }
 
 final textToSpeechServiceProvider = Provider<TextToSpeechService>((ref) {
@@ -256,7 +261,6 @@ final textToSpeechServiceProvider = Provider<TextToSpeechService>((ref) {
 });
 
 final textToSpeechControllerProvider =
-    StateNotifierProvider<TextToSpeechController, TextToSpeechState>((ref) {
-      final service = ref.watch(textToSpeechServiceProvider);
-      return TextToSpeechController(service);
-    });
+    NotifierProvider<TextToSpeechController, TextToSpeechState>(
+      TextToSpeechController.new,
+    );