feat: 完善文档集管理功能

- 新增文档集保存功能，支持命名和时间戳
   - 实现文档集删除功能
   - 添加文档集列表展示界面
   - 优化文档集 UI 样式和交互

src/views/docsetDialog.ts

@@ -286,6 +286,34 @@ export function getDocsetDialogScript(): string {
       closeDocsetDialog();
     }
 
+    function renderDocumentSets(documentSets) {
+      const listEl = document.getElementById('contextDocsList');
+      if (!listEl) return;
+
+      if (!documentSets || documentSets.length === 0) {
+        listEl.innerHTML = '<div class="context-empty"><p>暂无文档集</p></div>';
+        return;
+      }
+
+      listEl.innerHTML = documentSets.map(ds => \`
+        <div class="docset-item">
+          <div class="docset-name">\${ds.name}</div>
+          <div class="docset-meta">更新于 \${new Date(ds.updatedAt).toLocaleString('zh-CN')}</div>
+          <button class="docset-delete-btn" onclick="deleteDocumentSet('\${ds.id}')">
+            <svg width="14" height="14" viewBox="0 0 16 16" fill="currentColor">
+              <path d="M10 3h3v1h-1v9l-1 1H4l-1-1V4H2V3h3V2a1 1 0 0 1 1-1h3a1 1 0 0 1 1 1v1zM9 2H6v1h3V2zM4 13h7V4H4v9zm2-8H5v7h1V5zm1 0h1v7H7V5zm2 0h1v7H9V5z"/>
+            </svg>
+          </button>
+        </div>
+      \`).join('');
+    }
+
+    function deleteDocumentSet(id) {
+      if (confirm('确定删除此文档集？')) {
+        vscode.postMessage({ command: 'deleteDocumentSet', id });
+      }
+    }
+
     window.addEventListener('message', event => {
       const message = event.data;
       if (message.command === 'filesSelectedForDocset') {
@@ -294,6 +322,8 @@ export function getDocsetDialogScript(): string {
         }
         docsetFiles = [...docsetFiles, ...message.files];
         updateDocsetDisplay();
+      } else if (message.command === 'documentSetSaved') {
+        renderDocumentSets(message.documentSets);
       }
     });
   `;