feat: 静态页面开发完成

lib/app.dart

@@ -14,14 +14,27 @@ class ZhinianApp extends ConsumerWidget {
     final router = ref.watch(routerProvider);
     final settings = ref.watch(settingsProvider);
 
+    final platformBrightness = MediaQuery.platformBrightnessOf(context);
+    final isDark = switch (settings.themeMode) {
+      AppThemeMode.light => false,
+      AppThemeMode.dark => true,
+      AppThemeMode.system => platformBrightness == Brightness.dark,
+    };
+    AppColors.applyMode(isDark);
+
     return MaterialApp.router(
-      title: '智念管理',
+      title: '智念商家端',
       debugShowCheckedModeBanner: false,
-      theme: AppTheme.lightTheme,
-      darkTheme: AppTheme.darkTheme,
-      themeMode: settings.flutterThemeMode,
+      theme: AppTheme.theme,
       routerConfig: router,
       locale: settings.locale,
+      // Pages read AppColors.* statics directly; without a key, Router won't
+      // rebuild descendants on a pure theme toggle. Keying by mode forces the
+      // whole subtree to remount so every page picks up the new colors.
+      builder: (context, child) => KeyedSubtree(
+        key: ValueKey<bool>(isDark),
+        child: child ?? const SizedBox.shrink(),
+      ),
       localizationsDelegates: const [
         AppLocalizations.delegate,
         GlobalMaterialLocalizations.delegate,