feat: Enhance TTS player functionality and UI

- Added resume functionality to TTS player when paused.
- Display voice name or language in TTS player UI.
- Improved error handling in reader provider with debug messages.
- Updated TTS service to configure Vietnamese voice and handle platform-specific audio settings.
- Removed wakelock dependency and related code.
- Fixed search screen error handling.
- Updated settings screen to navigate to home after sign out.
- Improved splash screen with timer management.
- Enhanced main app error handling with logging.
- Removed unused package_info_plus and wakelock_plus dependencies.
- Added environment variable support for mobile runtime.
- Integrated Google Sign-In configuration for Android.
- Created logging observer for Riverpod providers.
- Added scripts for environment setup and Google Sign-In validation.

lib/features/auth/presentation/login_screen.dart

@@ -5,11 +5,28 @@ import 'package:go_router/go_router.dart';
 import '../../../app/router/route_names.dart';
 import '../providers/auth_provider.dart';
 
-class LoginScreen extends ConsumerWidget {
+class LoginScreen extends ConsumerStatefulWidget {
   const LoginScreen({super.key});
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<LoginScreen> createState() => _LoginScreenState();
+}
+
+class _LoginScreenState extends ConsumerState<LoginScreen> {
+  bool _startedSignIn = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (!mounted || _startedSignIn) return;
+      _startedSignIn = true;
+      ref.read(authProvider.notifier).signInWithGoogle();
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
     final authState = ref.watch(authProvider);
 
     ref.listen<AuthState>(authProvider, (_, next) {
@@ -42,6 +59,16 @@ class LoginScreen extends ConsumerWidget {
                   Text(errorMsg, style: const TextStyle(color: Colors.red)),
                   const SizedBox(height: 16),
                 ],
+                if (authState is AuthLoading) ...[
+                  const SizedBox(
+                    width: 22,
+                    height: 22,
+                    child: CircularProgressIndicator(strokeWidth: 2),
+                  ),
+                  const SizedBox(height: 12),
+                  const Text('Đang mở Google Sign-In...'),
+                  const SizedBox(height: 20),
+                ],
                 FilledButton.icon(
                   onPressed: isLoading
                       ? null