fix: persist extension enabled state and clear search provider when disabled

- Save enabled state to settings store when extension is enabled/disabled
- Restore enabled state from settings store when extension is loaded
- Clear searchProvider setting when the extension is disabled
- Update search hint to check if extension is still enabled

go_backend/extension_manager.go

@@ -369,6 +369,13 @@ func (m *ExtensionManager) SetExtensionEnabled(extensionID string, enabled bool)
 
 	ext.Enabled = enabled
 	GoLog("[Extension] %s %s\n", extensionID, map[bool]string{true: "enabled", false: "disabled"}[enabled])
+
+	// Persist enabled state to settings store
+	store := GetExtensionSettingsStore()
+	if err := store.Set(extensionID, "_enabled", enabled); err != nil {
+		GoLog("[Extension] Failed to persist enabled state for %s: %v\n", extensionID, err)
+	}
+
 	return nil
 }
 
@@ -457,6 +464,15 @@ func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedEx
 		SourceDir: dirPath,
 	}
 
+	// Restore enabled state from settings store
+	store := GetExtensionSettingsStore()
+	if enabledVal, err := store.Get(manifest.Name, "_enabled"); err == nil {
+		if enabled, ok := enabledVal.(bool); ok {
+			ext.Enabled = enabled
+			GoLog("[Extension] Restored enabled state for %s: %v\n", manifest.Name, enabled)
+		}
+	}
+
 	// Initialize Goja VM
 	if err := m.initializeVM(ext); err != nil {
 		ext.Error = err.Error()

lib/providers/extension_provider.dart

@@ -1,6 +1,7 @@
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:spotiflac_android/services/platform_bridge.dart';
 import 'package:spotiflac_android/utils/logger.dart';
+import 'package:spotiflac_android/providers/settings_provider.dart';
 
 final _log = AppLogger('ExtensionProvider');
 
@@ -528,6 +529,15 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
       }).toList();
       
       state = state.copyWith(extensions: extensions);
+      
+      // If disabling an extension that is the current search provider, clear it
+      if (!enabled) {
+        final settings = ref.read(settingsProvider);
+        if (settings.searchProvider == extensionId) {
+          ref.read(settingsProvider.notifier).setSearchProvider(null);
+          _log.d('Cleared search provider because extension $extensionId was disabled');
+        }
+      }
     } catch (e) {
       _log.e('Failed to set extension enabled: $e');
       state = state.copyWith(error: e.toString());

lib/screens/home_tab.dart

@@ -779,10 +779,15 @@ class _HomeTabState extends ConsumerState<HomeTab> with AutomaticKeepAliveClient
     if (searchProvider != null && searchProvider.isNotEmpty) {
       final extState = ref.read(extensionProvider);
       final ext = extState.extensions.where((e) => e.id == searchProvider).firstOrNull;
-      if (ext?.searchBehavior?.placeholder != null) {
-        return ext!.searchBehavior!.placeholder!;
+      // Only show extension placeholder if extension exists AND is enabled
+      if (ext != null && ext.enabled) {
+        if (ext.searchBehavior?.placeholder != null) {
+          return ext.searchBehavior!.placeholder!;
+        }
+        return 'Search with ${ext.displayName}...';
       }
-      return 'Search with ${ext?.displayName ?? 'extension'}...';
+      // Extension not found or disabled - clear the search provider setting
+      // and return default hint
     }
     return 'Paste Spotify URL or search...';
   }