fix(regression): resolve dogfood findings across marketing, auth, e2e and docs

- Fix list-to-detail navigation on product/service/solution/case pages
- Fix soft 404 on service detail by removing (marketing)/loading.tsx and using force-dynamic
- Fix contact form submission feedback and news placeholder image handling
- Unify SSR/client authentication state in auth.ts
- Add "新闻动态" to main navigation
- Fix Playwright storageState path and Firefox footer link flakiness
- Add E2E coverage for nav dropdown, cases filter and auth token parsing
- Update visual regression baselines (desktop/tablet/mobile, chromium/webkit/firefox)
- Update README, lessons-learned and add REGRESSION_REPORT_2026-07-27.md
- Ignore .lighthouseci/ and heading-hierarchy-report.json

e2e/p2-functional-e2e.spec.ts

@@ -647,27 +647,46 @@ test.describe('Footer - 全局底部区域', () => {
   });
 
   test('Footer 导航链接可点击', async ({ page }) => {
-    const footer = page.locator('footer, [data-testid="footer"]').first();
-
-    // 检查隐私政策和服务条款链接
-    const privacyLink = footer.locator('a:has-text("隐私政策")');
-    if (await privacyLink.count() > 0 && await privacyLink.isVisible()) {
-      await privacyLink.click();
-      await page.waitForTimeout(1000);
-      expect(page.url()).toContain('/privacy');
-    }
-
-    // 返回首页检查服务条款
+    // 隐私政策链接：独立测试，避免 Firefox 中连续全页导航的竞态问题
     await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
-    await page.evaluate(() => window.scrollTo(0, document.body.scrollHeight));
-    await page.waitForTimeout(500);
+    await page.waitForTimeout(1500);
 
-    const termsLink = footer.locator('a:has-text("服务条款")');
-    if (await termsLink.count() > 0 && await termsLink.isVisible()) {
-      await termsLink.click();
-      await page.waitForTimeout(1000);
-      expect(page.url()).toContain('/terms');
-    }
+    const privacyClicked = await page.evaluate(() => {
+      const link = document.querySelector('footer a, [data-testid="footer"] a') as HTMLAnchorElement | null;
+      if (!link) return false;
+      const privacy = Array.from(document.querySelectorAll('footer a, [data-testid="footer"] a'))
+        .find((el) => el.textContent?.includes('隐私政策')) as HTMLAnchorElement | undefined;
+      if (privacy) {
+        privacy.scrollIntoView({ behavior: 'instant', block: 'center' });
+        privacy.click();
+        return true;
+      }
+      return false;
+    });
+
+    expect(privacyClicked).toBe(true);
+    await page.waitForURL(/\/privacy/, { timeout: 15000 });
+    expect(page.url()).toContain('/privacy');
+  });
+
+  test('Footer 服务条款链接可点击', async ({ page }) => {
+    await page.goto('/', { waitUntil: 'domcontentloaded', timeout: 30000 });
+    await page.waitForTimeout(1500);
+
+    const termsClicked = await page.evaluate(() => {
+      const terms = Array.from(document.querySelectorAll('footer a, [data-testid="footer"] a'))
+        .find((el) => el.textContent?.includes('服务条款')) as HTMLAnchorElement | undefined;
+      if (terms) {
+        terms.scrollIntoView({ behavior: 'instant', block: 'center' });
+        terms.click();
+        return true;
+      }
+      return false;
+    });
+
+    expect(termsClicked).toBe(true);
+    await page.waitForURL(/\/terms/, { timeout: 15000 });
+    expect(page.url()).toContain('/terms');
   });
 
   test('Footer 包含联系方式（邮箱）', async ({ page }) => {