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/components/AssetStreamPage.tsx

@@ -1,5 +1,6 @@
 import type { PostScope } from "../types/post";
 import { MessageStream } from "./messageStream/MessageStream";
+import { useSetPageTitle } from "./PageTitleContext";
 
 type AssetStreamPageProps = {
   title: string;
@@ -7,9 +8,12 @@ type AssetStreamPageProps = {
 };
 
 export function AssetStreamPage({ title, scope }: AssetStreamPageProps) {
+  // Show the page name in the global header instead of a separate title row,
+  // saving vertical space.
+  useSetPageTitle(title);
   return (
     <section>
-      <MessageStream scope={scope} title={title} />
+      <MessageStream scope={scope} />
     </section>
   );
 }

src/components/PageTitleContext.tsx

@@ -0,0 +1,41 @@
+import {
+  createContext,
+  useContext,
+  useEffect,
+  useState,
+  type PropsWithChildren,
+} from "react";
+
+type PageTitleCtx = {
+  title: string | null;
+  setTitle: (title: string | null) => void;
+};
+
+const PageTitleContext = createContext<PageTitleCtx | null>(null);
+
+/**
+ * Lets a page publish its title to the global header so the header can show the
+ * current page name (e.g. "全部资料" / "热门资料") in place of the brand, avoiding
+ * a separate on-page title row. Pages that don't set one fall back to the brand.
+ */
+export function PageTitleProvider({ children }: PropsWithChildren) {
+  const [title, setTitle] = useState<string | null>(null);
+  return (
+    <PageTitleContext.Provider value={{ title, setTitle }}>
+      {children}
+    </PageTitleContext.Provider>
+  );
+}
+
+export function usePageTitle(): string | null {
+  return useContext(PageTitleContext)?.title ?? null;
+}
+
+/** Publish the current page's title; clears it again when the page unmounts. */
+export function useSetPageTitle(title: string | null): void {
+  const setTitle = useContext(PageTitleContext)?.setTitle;
+  useEffect(() => {
+    setTitle?.(title);
+    return () => setTitle?.(null);
+  }, [setTitle, title]);
+}

src/components/messageStream/MessageStream.tsx

@@ -6,17 +6,15 @@ import type { PostScope } from "../../types/post";
 import { Reveal } from "../../motion";
 import { Skeleton } from "../Skeleton";
 import { FilterChips } from "./FilterChips";
-import { SectionHeader } from "../SectionHeader";
 import { MessageBubble } from "./MessageBubble";
 import { useGroupedByDay } from "./hooks/useGroupedByDay";
 import { usePostStream } from "./hooks/usePostStream";
 
 export type MessageStreamProps = {
   scope: PostScope;
-  title?: string;
 };
 
-export function MessageStream({ scope, title }: MessageStreamProps) {
+export function MessageStream({ scope }: MessageStreamProps) {
   const { t, lang } = useI18n();
   const [sp, setSp] = useSearchParams();
   const { hash } = useLocation();
@@ -116,14 +114,9 @@ export function MessageStream({ scope, title }: MessageStreamProps) {
 
   return (
     <div className="mx-auto max-w-full md:max-w-[820px] lg:max-w-[1080px] xl:max-w-[1180px]">
-      {/* Title + filters stay pinned below the global header so users always
-          see which page they're on and can switch filters while scrolling. */}
+      {/* Filters stay pinned below the global header (which shows the page
+          name) so users can switch filters while scrolling. */}
       <div className="sticky top-[64px] z-30 bg-ark-bg md:top-[70px]">
-        {title ? (
-          <div className="px-4 pb-1 pt-2 md:px-0">
-            <SectionHeader title={title} />
-          </div>
-        ) : null}
         <FilterChips type={type} onTypeChange={(v) => updateParam("type", v)} />
       </div>