fix(mail2925): 修复验证码轮询与登录态复用逻辑并清理中文文案，重构 sidepanel：统一 Hotmail 和 2925 号池表单交互

- 抽出共享 account-pool-ui helper
- 统一添加账号、取消添加、批量导入交互
- 调整号池列表收起高度与按钮布局
- 补充测试并同步更新项目文档

sidepanel/sidepanel.js

@@ -148,10 +148,12 @@ const inputHotmailRefreshToken = document.getElementById('input-hotmail-refresh-
 const inputHotmailImport = document.getElementById('input-hotmail-import');
 const btnAddHotmailAccount = document.getElementById('btn-add-hotmail-account');
 const btnImportHotmailAccounts = document.getElementById('btn-import-hotmail-accounts');
+const btnToggleHotmailForm = document.getElementById('btn-toggle-hotmail-form');
 const btnHotmailUsageGuide = document.getElementById('btn-hotmail-usage-guide');
 const btnClearUsedHotmailAccounts = document.getElementById('btn-clear-used-hotmail-accounts');
 const btnDeleteAllHotmailAccounts = document.getElementById('btn-delete-all-hotmail-accounts');
 const btnToggleHotmailList = document.getElementById('btn-toggle-hotmail-list');
+const hotmailFormShell = document.getElementById('hotmail-form-shell');
 const hotmailListShell = document.getElementById('hotmail-list-shell');
 const hotmailAccountsList = document.getElementById('hotmail-accounts-list');
 const inputMail2925Email = document.getElementById('input-mail2925-email');
@@ -3086,7 +3088,9 @@ const hotmailManager = window.SidepanelHotmailManager?.createHotmailManager({
     btnDeleteAllHotmailAccounts,
     btnHotmailUsageGuide,
     btnImportHotmailAccounts,
+    btnToggleHotmailForm,
     btnToggleHotmailList,
+    hotmailFormShell,
     hotmailAccountsList,
     hotmailListShell,
     inputEmail,