feat: 添加编辑和取消编辑功能到2925邮箱管理器，更新相关UI和测试用例

sidepanel/sidepanel.html

@@ -35,7 +35,7 @@
     <div class="header-btns">
       <div class="run-group">
         <button id="btn-contribution-mode" class="btn btn-outline btn-sm btn-contribution-mode" type="button"
-          aria-pressed="false" title="进入贡献模式">贡献</button>
+          aria-pressed="false" title="进入贡献模式">贡献/使用</button>
         <input type="number" id="input-run-count" class="run-count-input" value="1" min="1" max="50" title="运行次数" />
         <button id="btn-auto-run" class="btn btn-success" title="自动执行全部步骤">
           <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor">
@@ -455,7 +455,10 @@
       </div>
       <div class="data-row hotmail-actions-row">
         <span class="data-label"></span>
-        <button id="btn-add-mail2925-account" class="btn btn-primary btn-sm" type="button">添加账号</button>
+        <div class="data-inline">
+          <button id="btn-add-mail2925-account" class="btn btn-primary btn-sm" type="button">添加账号</button>
+          <button id="btn-cancel-mail2925-edit" class="btn btn-outline btn-sm" type="button" style="display:none;">取消编辑</button>
+        </div>
       </div>
       <div class="data-row hotmail-import-row">
         <span class="data-label">批量导入</span>