feat: 添加步骤 5 提交状态验证和重试页面恢复逻辑，更新相关测试用例

background/signup-flow-helpers.js

@@ -125,7 +125,7 @@
     function fallbackSignupProfilePageUrl(rawUrl) {
       const parsed = parseUrlSafely(rawUrl);
       if (!parsed) return false;
-      return /\/(?:create-account\/profile|u\/signup\/profile|signup\/profile)(?:[/?#]|$)/i.test(parsed.pathname || '');
+      return /\/(?:create-account\/profile|u\/signup\/profile|signup\/profile|about-you)(?:[/?#]|$)/i.test(parsed.pathname || '');
     }
 
     function resolveSignupPostIdentityState(rawUrl) {

background/verification-flow.js

@@ -159,7 +159,7 @@
         if (!['auth.openai.com', 'auth0.openai.com', 'accounts.openai.com'].includes(host)) {
           return false;
         }
-        return /\/(?:create-account\/profile|u\/signup\/profile|signup\/profile)(?:[/?#]|$)/i.test(String(parsed.pathname || ''));
+        return /\/(?:create-account\/profile|u\/signup\/profile|signup\/profile|about-you)(?:[/?#]|$)/i.test(String(parsed.pathname || ''));
       } catch {
         return false;
       }