fix: initialize extension system at app start for proper search hint

- Move extension system initialization to main.dart _EagerInitialization
- Show default search hint until extension system is initialized
- Watch extension state changes to update search hint dynamically

lib/main.dart

@@ -1,7 +1,10 @@
+import 'dart:io';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:spotiflac_android/app.dart';
 import 'package:spotiflac_android/providers/download_queue_provider.dart';
+import 'package:spotiflac_android/providers/extension_provider.dart';
 import 'package:spotiflac_android/services/notification_service.dart';
 import 'package:spotiflac_android/services/share_intent_service.dart';
 
@@ -24,14 +27,42 @@ void main() async {
 }
 
 /// Widget to eagerly initialize providers that need to load data on startup
-class _EagerInitialization extends ConsumerWidget {
+class _EagerInitialization extends ConsumerStatefulWidget {
   const _EagerInitialization({required this.child});
   final Widget child;
 
   @override
-  Widget build(BuildContext context, WidgetRef ref) {
+  ConsumerState<_EagerInitialization> createState() => _EagerInitializationState();
+}
+
+class _EagerInitializationState extends ConsumerState<_EagerInitialization> {
+  @override
+  void initState() {
+    super.initState();
+    _initializeExtensions();
+  }
+
+  Future<void> _initializeExtensions() async {
+    try {
+      final appDir = await getApplicationDocumentsDirectory();
+      final extensionsDir = '${appDir.path}/extensions';
+      final dataDir = '${appDir.path}/extension_data';
+      
+      // Create directories if needed
+      await Directory(extensionsDir).create(recursive: true);
+      await Directory(dataDir).create(recursive: true);
+      
+      // Initialize extension system
+      await ref.read(extensionProvider.notifier).initialize(extensionsDir, dataDir);
+    } catch (e) {
+      debugPrint('Failed to initialize extensions: $e');
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
     // Eagerly initialize download history provider to load from storage
     ref.watch(downloadHistoryProvider);
-    return child;
+    return widget.child;
   }
 }

lib/screens/home_tab.dart

@@ -320,6 +320,10 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     final error = ref.watch(trackProvider.select((s) => s.error));
     final hasSearchedBefore = ref.watch(settingsProvider.select((s) => s.hasSearchedBefore));
     
+    // Watch extension state to update search hint when extensions load/change
+    ref.watch(extensionProvider.select((s) => s.isInitialized));
+    ref.watch(extensionProvider.select((s) => s.extensions));
+    
     final colorScheme = Theme.of(context).colorScheme;
     final hasResults = _isTyping || tracks.isNotEmpty || (searchArtists != null && searchArtists.isNotEmpty) || isLoading;
     final screenHeight = MediaQuery.of(context).size.height;
@@ -775,9 +779,14 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
   String _getSearchHint() {
     final settings = ref.read(settingsProvider);
     final searchProvider = settings.searchProvider;
+    final extState = ref.read(extensionProvider);
+    
+    // If extension system not initialized yet, show default hint
+    if (!extState.isInitialized) {
+      return 'Paste Spotify URL or search...';
+    }
     
     if (searchProvider != null && searchProvider.isNotEmpty) {
-      final extState = ref.read(extensionProvider);
       final ext = extState.extensions.where((e) => e.id == searchProvider).firstOrNull;
       // Only show extension placeholder if extension exists AND is enabled
       if (ext != null && ext.enabled) {