feat(home): 使用胶片盘图片导航图标

test/home/app_bottom_nav_test.dart

@@ -179,4 +179,29 @@ void main() {
       findsWidgets,
     );
   });
+
+  testWidgets('should_fallback_when_asset_icon_is_missing', (tester) async {
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Scaffold(
+          bottomNavigationBar: AppBottomNav(
+            items: [
+              AppBottomNavItem(
+                tabKey: const Key('tab-home'),
+                icon: Icons.theaters_outlined,
+                selectedIcon: Icons.theaters,
+                assetPath: 'assets/icon/missing_film_reel.png',
+                label: 'Home',
+                selected: true,
+                onTap: () {},
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.byIcon(Icons.theaters_outlined), findsOneWidget);
+  });
 }

test/home/home_nav_ui_test.dart

@@ -191,7 +191,7 @@ void main() {
     expect(
       find.descendant(
         of: find.byKey(const Key('tab-home')),
-        matching: find.byIcon(Icons.theaters),
+        matching: find.byType(Image),
       ),
       findsOneWidget,
     );
@@ -218,14 +218,28 @@ void main() {
     );
     expect(
       tester
-          .widget<Icon>(
+          .widget<ColorFiltered>(
             find.descendant(
               of: find.byKey(const Key('tab-home')),
-              matching: find.byIcon(Icons.theaters),
+              matching: find.byType(ColorFiltered),
             ),
           )
-          .color,
-      AppColors.navSelected,
+          .colorFilter,
+      const ColorFilter.mode(AppColors.navSelected, BlendMode.srcIn),
+    );
+    final selectedHomeImage = tester.widget<Image>(
+      find.descendant(
+        of: find.byKey(const Key('tab-home')),
+        matching: find.byType(Image),
+      ),
+    );
+    expect(
+      (selectedHomeImage.image as AssetImage).assetName,
+      'assets/icon/film_reel.png',
+    );
+    expect(
+      Size(selectedHomeImage.width!, selectedHomeImage.height!),
+      const Size.square(AppDimens.navIcon),
     );
 
     await tester.tap(find.byKey(const Key('tab-recommend')));
@@ -271,10 +285,21 @@ void main() {
     expect(
       find.descendant(
         of: find.byKey(const Key('tab-home')),
-        matching: find.byIcon(Icons.theaters_outlined),
+        matching: find.byType(Image),
       ),
       findsOneWidget,
     );
+    expect(
+      tester
+          .widget<ColorFiltered>(
+            find.descendant(
+              of: find.byKey(const Key('tab-home')),
+              matching: find.byType(ColorFiltered),
+            ),
+          )
+          .colorFilter,
+      const ColorFilter.mode(AppColors.navUnselected, BlendMode.srcIn),
+    );
   });
 
   testWidgets('should_map_four_tabs_to_home_recommend_following_and_me', (