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

tests/sidepanel-mail2925-edit.test.js

@@ -2,6 +2,49 @@ const test = require('node:test');
 const assert = require('node:assert/strict');
 const fs = require('node:fs');
 
+function createAccountPoolUiStub() {
+  return {
+    createAccountPoolFormController({
+      formShell,
+      toggleButton,
+      hiddenLabel = '添加账号',
+      visibleLabel = '取消添加',
+      onClear,
+      onFocus,
+    } = {}) {
+      let visible = false;
+
+      function sync() {
+        if (formShell) {
+          formShell.hidden = !visible;
+        }
+        if (toggleButton) {
+          toggleButton.textContent = visible ? visibleLabel : hiddenLabel;
+          toggleButton.setAttribute?.('aria-expanded', String(visible));
+        }
+      }
+
+      function setVisible(nextVisible, options = {}) {
+        visible = Boolean(nextVisible);
+        if (options.clearForm) {
+          onClear?.();
+        }
+        sync();
+        if (visible && options.focusField) {
+          onFocus?.();
+        }
+      }
+
+      sync();
+      return {
+        isVisible: () => visible,
+        setVisible,
+        sync,
+      };
+    },
+  };
+}
+
 test('sidepanel html contains collapsible mail2925 form controls', () => {
   const html = fs.readFileSync('sidepanel/sidepanel.html', 'utf8');
   assert.match(html, /id="btn-toggle-mail2925-form"/);
@@ -11,7 +54,9 @@ test('sidepanel html contains collapsible mail2925 form controls', () => {
 
 test('mail2925 manager renders edit action for existing accounts', () => {
   const source = fs.readFileSync('sidepanel/mail-2925-manager.js', 'utf8');
-  const windowObject = {};
+  const windowObject = {
+    SidepanelAccountPoolUi: createAccountPoolUiStub(),
+  };
   const localStorageMock = {
     getItem() {
       return null;