feat: 顶栏显示当前页名,去掉独立标题行;Logo回首页/页名回顶部

- 新增 PageTitleContext:页面上报标题,顶栏 brand 位显示当前页名(全部资料/
  热门资料/最新/官方/分类名/搜索/我的收藏),未上报则回退品牌名
- AssetStreamPage、Favorites 上报标题;移除资料流内单独的标题行,省出空间
- 顶栏拆分点击:Logo→首页(首页则回顶部);页名文字→回到当前页顶部

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/pages/Favorites/index.tsx

@@ -2,9 +2,12 @@ import { Heart } from "lucide-react";
 import { Link } from "react-router-dom";
 import { useI18n } from "../../i18n";
 import { Reveal } from "../../motion";
+import { useSetPageTitle } from "../../components/PageTitleContext";
 
 export default function Favorites() {
   const { t } = useI18n();
+  // Show "我的收藏" in the global header, consistent with the other pages.
+  useSetPageTitle(t("favorites"));
 
   return (
     <Reveal className="flex min-h-[60vh] flex-col items-center justify-center gap-5 px-4 py-12 text-center">