feat: Implement TTS playback store and enhance reading progress synchronization

- Added ReaderTtsPlaybackStore to manage TTS start requests with a maximum of 4 pending requests.
- Updated app configuration to use a production API URL.
- Enhanced BookmarkModel to infer type when not provided by the API for backward compatibility.
- Introduced methods in LocalStore for saving, loading, and clearing the last route path.
- Implemented syncProgress method in BookshelfNotifier to update reading progress and bookmarks from the server.
- Modified ReaderScreen to handle chapter navigation and TTS playback more effectively, including auto-start logic.
- Updated TtsPlayerWidget to accept additional parameters for chapter navigation.
- Enhanced TtsNotifier to handle new parameters for TTS requests and manage playback state.
- Improved SplashScreen to restore the last visited route after splash screen display.

lib/features/reader/tts/tts_service.dart

@@ -5,6 +5,8 @@ import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_tts/flutter_tts.dart';
 
+import '../../../core/config/app_config.dart';
+
 enum TtsStatus { idle, playing, paused }
 
 const double kTtsBaseSpeechRate = 0.9;
@@ -635,12 +637,19 @@ class TtsNotifier extends StateNotifier<TtsState> {
     int? startCharOffset,
     String? contentKey,
     String? title,
+    String? nextChapterId,
+    int? chapterNumber,
+    String? apiBaseUrl,
     bool includeTitle = true,
   }) async {
     if (!_initialized) {
       await (_initFuture ?? _init());
     }
 
+    // A direct start request (tap sentence/play button) should win over any
+    // queued chapter auto-start from previous navigation/completion events.
+    state = state.copyWith(clearPendingAutoStartChapterId: true);
+
     _segments = _buildSegments(
       content,
       title: title,
@@ -685,14 +694,18 @@ class TtsNotifier extends StateNotifier<TtsState> {
 
       try {
         await _mediaChannel.invokeMethod<void>('startReading', {
+          'content': content,
           'contentKey': contentKey,
           'title': title,
+          'nextChapterId': nextChapterId,
+          'chapterNumber': chapterNumber,
+          'apiBaseUrl': apiBaseUrl ?? AppConfig.baseUrl,
           'startIndex': validIndex,
           'speed': state.speed,
           'language': state.language,
           'voiceName': state.voiceName,
           'backgroundModeEnabled': state.backgroundModeEnabled,
-          'segments': _segments.map((segment) => segment.toMap()).toList(),
+          'includeTitle': includeTitle,
         });
       } on PlatformException {
         await _startFallbackReading(