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/playwright.config.ts

@@ -1,6 +1,10 @@
 import { defineConfig, devices } from '@playwright/test';
+import { config as dotenvConfig } from 'dotenv';
+import path from 'path';
 
-// 为 CMS 工作流 E2E 测试提供默认 revalidate secret
+// 加载项目根目录的 .env.local，使 Playwright webServer 与测试进程使用相同的 CMS_REVALIDATE_SECRET
+// 若 .env.local 不存在则回退到默认测试 secret
+dotenvConfig({ path: path.resolve(__dirname, '../.env.local') });
 process.env.CMS_REVALIDATE_SECRET = process.env.CMS_REVALIDATE_SECRET || 'e2e-test-secret';
 
 export default defineConfig({
@@ -17,7 +21,8 @@ export default defineConfig({
   snapshotPathTemplate: '{snapshotDir}/{projectName}/{testFilePath}/{arg}-{projectName}{ext}',
   use: {
     baseURL: process.env.E2E_BASE_URL || 'http://localhost:3000',
-    storageState: './storageState.json',
+    // 路径以配置文件所在目录为基准，兼容 `cd e2e` 与从项目根目录直接调用两种执行方式
+    storageState: path.resolve(__dirname, 'storageState.json'),
     trace: 'on-first-retry',
     screenshot: 'only-on-failure',
     ignoreHTTPSErrors: true,