feat: complete TASK-WP2-04 credit ledger

apps/web/src/project-pages.tsx

@@ -117,21 +117,21 @@ async function downloadConflictPng(canvasState: CanvasState, projectName: string
   setTimeout(() => URL.revokeObjectURL(url), 0);
 }
 
-function ProductHeader({ current }: { current: "workspace" | "projects" }) {
+export function ProductHeader({ current }: { current: "workspace" | "projects" | "credits" }) {
   return (
     <header className="product-header">
       <a className="product-brand" href="/app">DADA</a>
       <nav aria-label="主导航">
         <a aria-current={current === "workspace" ? "page" : undefined} href="/app">创作</a>
         <a aria-current={current === "projects" ? "page" : undefined} href="/app/projects">项目</a>
-        <a href="/app/credits">点数</a>
+        <a aria-current={current === "credits" ? "page" : undefined} href="/app/credits">点数</a>
         <a href="/app/settings">设置</a>
       </nav>
     </header>
   );
 }
 
-function LocalOnlyFooter() {
+export function LocalOnlyFooter() {
   return <footer className="local-only-footer">测试数据仅保存在本机，不自动备份，也不会迁移到正式系统。</footer>;
 }