improve image caching and disposal

app/lib/features/geckoview/domain/providers/tab_state.dart

@@ -122,24 +122,24 @@ class TabStates extends _$TabStates {
   Future<void> _onIconChange(IconChangeEvent event) async {
     final IconChangeEvent(:tabId, :bytes) = event;
 
-    // Dispose old icon before replacing
-    state[tabId]?.icon?.dispose();
-
     final image = await bytes.mapNotNull((bytes) => tryDecodeImage(bytes));
-
     final current = state[tabId] ?? TabState.$default(tabId);
+
+    // Dispose old icon only after successfully creating new one
+    current.icon?.dispose();
+
     state = {...state}..[tabId] = current.copyWith.icon(image);
   }
 
   Future<void> _onThumbnailChange(ThumbnailEvent event) async {
     final ThumbnailEvent(:tabId, :bytes) = event;
 
-    // Dispose old thumbnail before replacing
-    state[tabId]?.thumbnail?.dispose();
-
     final image = await bytes.mapNotNull((bytes) => tryDecodeImage(bytes));
-
     final current = state[tabId] ?? TabState.$default(tabId);
+
+    // Dispose old thumbnail only after successfully creating new one
+    current.thumbnail?.dispose();
+
     state = {...state}..[tabId] = current.copyWith.thumbnail(image);
   }
 

app/lib/features/geckoview/domain/providers/tab_state.g.dart

@@ -41,7 +41,7 @@ final class TabStatesProvider
   }
 }
 
-String _$tabStatesHash() => r'f2e6920017b3f46944d85254c09c54779eb89eb3';
+String _$tabStatesHash() => r'67b497304b4137ce0115a66f06f3622c86e5727d';
 
 abstract class _$TabStates extends $Notifier<Map<String, TabState>> {
   Map<String, TabState> build();

app/lib/features/geckoview/domain/providers/web_extensions_state.dart

@@ -27,22 +27,31 @@ import 'package:weblibre/domain/entities/equatable_image.dart';
 import 'package:weblibre/features/geckoview/domain/entities/states/web_extension.dart';
 import 'package:weblibre/features/geckoview/domain/providers.dart';
 import 'package:weblibre/features/geckoview/utils/image_helper.dart';
+import 'package:weblibre/utils/lru_cache.dart';
 
 part 'web_extensions_state.g.dart';
 
 @Riverpod(keepAlive: true)
 class WebExtensionsState extends _$WebExtensionsState {
-  final _imageCache = <String, EquatableImage>{};
+  late final LRUCache<String, EquatableImage> _imageCache;
+
+  WebExtensionsState()
+    : _imageCache = LRUCache(50, onEvict: (image) => image.dispose());
 
   void _onExtensionUpdate(ExtensionDataEvent event) {
     final ExtensionDataEvent(:extensionId, :data) = event;
 
     if (data != null) {
+      final cachedIcon = _imageCache.get(extensionId);
+      if (cachedIcon != null && cachedIcon.value == null) {
+        _imageCache.remove(extensionId);
+      }
+
       final current =
           state[extensionId] ??
           WebExtensionState(
             extensionId: extensionId,
-            icon: _imageCache[extensionId],
+            icon: _imageCache.get(extensionId),
             enabled: false,
           );
 
@@ -73,10 +82,10 @@ class WebExtensionsState extends _$WebExtensionsState {
     final image = await tryDecodeImage(bytes);
 
     if (image != null) {
-      // Dispose old image before replacing
-      _imageCache[extensionId]?.dispose();
+      // Dispose old image only after successfully creating new one
+      _imageCache.get(extensionId)?.dispose();
 
-      _imageCache[extensionId] = image;
+      _imageCache.set(extensionId, image);
 
       if (state.containsKey(extensionId)) {
         state = {...state}
@@ -110,9 +119,6 @@ class WebExtensionsState extends _$WebExtensionsState {
 
     ref.onDispose(() async {
       // Dispose all cached images
-      for (final image in _imageCache.values) {
-        image.dispose();
-      }
       _imageCache.clear();
 
       // Cancel all stream subscriptions

app/lib/features/geckoview/domain/providers/web_extensions_state.g.dart

@@ -62,7 +62,7 @@ final class WebExtensionsStateProvider
 }
 
 String _$webExtensionsStateHash() =>
-    r'd7147f419889386f8cf526aed3318839ac22d893';
+    r'2664a50bb776197010e9da9b4e3a9379c849ba75';
 
 final class WebExtensionsStateFamily extends $Family
     with