merge: 合并最新 dev 分支（cloudflare-temp-email + iCloud）

- 解决 background.js / sidepanel.html / sidepanel.js / 测试文件共 24 处冲突
- LuckMail、Cloudflare Temp Email、iCloud 三种邮箱提供商正确共存
- step9 清理范围测试对齐 dev 分支行为（closeTabsByUrlPrefix 排除 OAuth callback URL）
- LuckMail 测试补充 dev 分支新增依赖的 mock
- 全部 76 个测试通过

tests/verification-stop-propagation.test.js

@@ -57,11 +57,12 @@ async function testPollFreshVerificationCodeRethrowsStop() {
     extractFunction('pollFreshVerificationCode'),
   ].join('\n');
 
-  const api = new Function(`
+const api = new Function(`
 let stopRequested = false;
 const STOP_ERROR_MESSAGE = '流程已被用户停止。';
 const HOTMAIL_PROVIDER = 'hotmail-api';
 const LUCKMAIL_PROVIDER = 'luckmail-api';
+const CLOUDFLARE_TEMP_EMAIL_PROVIDER = 'cloudflare-temp-email';
 const VERIFICATION_POLL_MAX_ROUNDS = 5;
 const logs = [];
 let resendCalls = 0;
@@ -123,10 +124,11 @@ async function testResolveVerificationStepRethrowsStopFromFreshRequest() {
     extractFunction('resolveVerificationStep'),
   ].join('\n');
 
-  const api = new Function(`
+const api = new Function(`
 const STOP_ERROR_MESSAGE = '流程已被用户停止。';
 const HOTMAIL_PROVIDER = 'hotmail-api';
 const LUCKMAIL_PROVIDER = 'luckmail-api';
+const CLOUDFLARE_TEMP_EMAIL_PROVIDER = 'cloudflare-temp-email';
 const logs = [];
 let pollCalls = 0;