v1.2.1: 操作后保持右侧面板显示，方便后续配置

templates/index.html

@@ -421,7 +421,10 @@
                                 <p class="text-xs text-gray-500">点击"开始选择"后，在画布上拖动选择区域</p>
                             </div>
                         `,
-                        actions: `<button onclick="startHoleSelection()" class="px-4 py-2 bg-blue-500 text-white rounded-lg w-full">开始选择</button>`
+                        actions: `
+                            <button onclick="startHoleSelection()" class="px-4 py-2 bg-blue-500 text-white rounded-lg w-full mb-2">开始选择</button>
+                            <button onclick="closePanel()" class="px-4 py-2 bg-gray-200 rounded-lg w-full">关闭面板</button>
+                        `
                     };
                 
                 case 'circle':
@@ -1245,7 +1248,6 @@
             document.getElementById('historyList').innerHTML = '<span class="text-gray-400 text-xs">暂无操作</span>';
             showEmptyHint();
             document.getElementById('splitResults').classList.add('hidden');
-            closePanel();
         }
 
         // 监听合并面板渲染