fix(home): 首页深色底部导航补齐安全区底色

test/home/home_nav_ui_test.dart

@@ -53,7 +53,7 @@ void main() {
     final decoration = bar.decoration as BoxDecoration;
     final border = decoration.border as Border;
     // 首页 feed 用深色导航。
-    expect(decoration.color, const Color(0xE6000000));
+    expect(decoration.color, Colors.black);
     expect(border.top.color, Colors.white12);
     expect(
       tester