修复推荐页封面遮罩与登录态刷新

推荐页运行态封面增加加载条并隔离层级，避免 runtime 内容穿透封面

登录态从未登录到已登录或退出后刷新当前页面，退出等待 token 清理完成后再刷新

补充推荐页封面、认证刷新与样式回归测试

同步平台链路、项目基线和 Hermes 决策文档

src/index.test.ts

@@ -131,12 +131,37 @@ describe('index stylesheet creation agent hero contrast', () => {
 });
 
 describe('index stylesheet recommend runtime cover', () => {
-  it('only fades the card cover out after runtime is ready', () => {
+  it('keeps the card cover above embedded runtime and only fades it when ready', () => {
     const css = readIndexCss();
 
+    const viewportBlock = getCssBlock(
+      css,
+      '.platform-recommend-runtime-viewport',
+    );
+    expect(viewportBlock).toContain('z-index: 1;');
+    expect(viewportBlock).toContain('isolation: isolate;');
+
     const coverBlock = getCssBlock(css, '.platform-recommend-runtime-cover');
+    expect(coverBlock).toContain('z-index: 30;');
+    expect(coverBlock).toContain('isolation: isolate;');
     expect(coverBlock).not.toContain('transition: opacity');
 
+    const loadingBlock = getCssBlock(
+      css,
+      '.platform-recommend-runtime-loading',
+    );
+    expect(loadingBlock).toContain('position: absolute;');
+    expect(loadingBlock).toContain('z-index: 4;');
+
+    const loadingAnimationBlock = getCssBlock(
+      css,
+      '.platform-recommend-runtime-loading::before',
+    );
+    expect(loadingAnimationBlock).toContain(
+      'animation: platform-recommend-runtime-loading 1.15s ease-in-out infinite;',
+    );
+    expect(css).toContain('@keyframes platform-recommend-runtime-loading');
+
     const hiddenCoverBlock = getCssBlock(
       css,
       '.platform-recommend-runtime-cover--hidden',