perf(tabs): release stale image and tab state

apps/weblibre/test/features/geckoview/domain/providers/tab_detail_state_test.dart

@@ -0,0 +1,34 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:riverpod/riverpod.dart';
+import 'package:weblibre/features/geckoview/domain/providers/tab_detail_state.dart';
+
+void main() {
+  test('closed tab progress is pruned without touching active tabs', () {
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+
+    final notifier = container.read(tabProgressStatesProvider.notifier);
+    notifier.update('closed-tab', 80);
+    notifier.update('active-tab', 40);
+
+    notifier.removeAll({'closed-tab', 'unknown-tab'});
+
+    expect(container.read(tabProgressStatesProvider), {'active-tab': 40});
+  });
+
+  test('pruning unrelated ids does not publish a new map', () {
+    final container = ProviderContainer();
+    addTearDown(container.dispose);
+
+    final notifier = container.read(tabProgressStatesProvider.notifier);
+    notifier.update('active-tab', 40);
+    final before = container.read(tabProgressStatesProvider);
+
+    notifier.removeAll({'unknown-tab'});
+
+    expect(
+      identical(container.read(tabProgressStatesProvider), before),
+      isTrue,
+    );
+  });
+}

apps/weblibre/test/features/geckoview/utils/image_helper_test.dart

@@ -75,6 +75,27 @@ void main() {
     });
   });
 
+  testWidgets('tryDecodeImage can bypass the global image cache', (
+    tester,
+  ) async {
+    await tester.runAsync(() async {
+      clearImageCache();
+      final svgBytes = Uint8List.fromList(utf8.encode(_svgIcon));
+
+      final first = await tryDecodeImage(svgBytes, cacheResult: false);
+      final second = await tryDecodeImage(svgBytes, cacheResult: false);
+
+      expect(first, isNotNull);
+      expect(second, isNotNull);
+      expect(first, equals(second));
+      expect(identical(first, second), isFalse);
+
+      // These are deliberately distinct uncached image resources.
+      first!.dispose();
+      second!.dispose();
+    });
+  });
+
   test('ImageIdentity compares structurally, not by a folded hash', () {
     const a = (
       digest: 0x0123456789ABCDEF,