优化 demo

apps/im_app/lib/features/settings/view/theme_view.dart

@@ -16,32 +16,27 @@ class ThemeView extends ConsumerWidget {
     final current = ref.watch(themeViewModelProvider);
 
     return Scaffold(
-      appBar: AppBar(
-        title: const Text('主题'),
-      ),
+      appBar: AppBar(title: const Text('主题')),
       body: ListView(
         children: [
           const SettingsSectionHeader(title: '外观'),
           ThemeOptionTile(
             label: '跟随系统',
-            mode: ThemeMode.system,
-            current: current,
+            isSelected: current == ThemeMode.system,
             onTap: () => ref
                 .read(themeViewModelProvider.notifier)
                 .setMode(ThemeMode.system),
           ),
           ThemeOptionTile(
             label: '黑色模式',
-            mode: ThemeMode.dark,
-            current: current,
+            isSelected: current == ThemeMode.dark,
             onTap: () => ref
                 .read(themeViewModelProvider.notifier)
                 .setMode(ThemeMode.dark),
           ),
           ThemeOptionTile(
             label: '白色模式',
-            mode: ThemeMode.light,
-            current: current,
+            isSelected: current == ThemeMode.light,
             onTap: () => ref
                 .read(themeViewModelProvider.notifier)
                 .setMode(ThemeMode.light),