fix(home): 首页深色底部导航补齐安全区底色

lib/core/widgets/app_bottom_nav.dart

@@ -43,37 +43,35 @@ class AppBottomNav extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final bar = Container(
+      key: barKey,
+      height: AppDimens.navHeight,
+      decoration: BoxDecoration(
+        color: dark ? Colors.black : backgroundColor.withValues(alpha: 0.95),
+        border: Border(
+          top: BorderSide(color: dark ? Colors.white12 : AppColors.border),
+        ),
+      ),
+      child: Row(
+        children: [
+          for (final item in items)
+            _NavDestination(
+              item: item,
+              unselectedColor: dark ? Colors.white70 : AppColors.navUnselected,
+            ),
+        ],
+      ),
+    );
+    if (dark) {
+      return ColoredBox(
+        color: Colors.black,
+        child: SafeArea(top: false, child: bar),
+      );
+    }
     return ClipRect(
       child: BackdropFilter(
         filter: ImageFilter.blur(sigmaX: 20, sigmaY: 20),
-        child: SafeArea(
-          top: false,
-          child: Container(
-            key: barKey,
-            height: AppDimens.navHeight,
-            decoration: BoxDecoration(
-              color: dark
-                  ? const Color(0xE6000000)
-                  : backgroundColor.withValues(alpha: 0.95),
-              border: Border(
-                top: BorderSide(
-                  color: dark ? Colors.white12 : AppColors.border,
-                ),
-              ),
-            ),
-            child: Row(
-              children: [
-                for (final item in items)
-                  _NavDestination(
-                    item: item,
-                    unselectedColor: dark
-                        ? Colors.white70
-                        : AppColors.navUnselected,
-                  ),
-              ],
-            ),
-          ),
-        ),
+        child: SafeArea(top: false, child: bar),
       ),
     );
   }