refactor(vscode-ide-companion): reorganize component structure

重构组件结构，优化目录组织：
- 将 ChatHeader 从 ui/ 移动到 layouts/ 目录
- 删除未使用的 Button 和 Card 组件
- 更新 tailwind.config.js 扫描路径为 layouts/
- 简化组件目录结构，提高可维护性

packages/vscode-ide-companion/NOTICES.txt

@@ -2317,6 +2317,12 @@ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
+============================================================
+@qwen-code/qwen-code-core@undefined
+(git+https://github.com/QwenLM/qwen-code.git)
+
+License text not found.
+
 ============================================================
 react@19.1.0
 (https://github.com/facebook/react.git)

packages/vscode-ide-companion/package.json

@@ -2,7 +2,7 @@
   "name": "qwen-code-vscode-ide-companion",
   "displayName": "Qwen Code Companion",
   "description": "Enable Qwen Code with direct access to your VS Code workspace.",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "publisher": "qwenlm",
   "icon": "assets/icon.png",
   "repository": {

packages/vscode-ide-companion/src/webview/components/layouts/ChatHeader.tsx

@@ -0,0 +1,109 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type React from 'react';
+
+interface ChatHeaderProps {
+  currentSessionTitle: string;
+  onLoadSessions: () => void;
+  onSaveSession: () => void;
+  onNewSession: () => void;
+}
+
+export const ChatHeader: React.FC<ChatHeaderProps> = ({
+  currentSessionTitle,
+  onLoadSessions,
+  onSaveSession: _onSaveSession,
+  onNewSession,
+}) => (
+  <div
+    className="flex gap-1 select-none py-1.5 px-2.5"
+    style={{
+      borderBottom: '1px solid var(--app-primary-border-color)',
+      backgroundColor: 'var(--app-header-background)',
+    }}
+  >
+    {/* Past Conversations Button */}
+    <button
+      className="flex-none py-1 px-2 bg-transparent border border-transparent rounded cursor-pointer flex items-center justify-center outline-none font-medium transition-colors duration-200 hover:bg-[var(--app-ghost-button-hover-background)] focus:bg-[var(--app-ghost-button-hover-background)]"
+      style={{
+        borderRadius: 'var(--corner-radius-small)',
+        color: 'var(--app-primary-foreground)',
+        fontSize: 'var(--vscode-chat-font-size, 13px)',
+      }}
+      onClick={onLoadSessions}
+      title="Past conversations"
+    >
+      <span className="flex items-center gap-1">
+        <span style={{ fontSize: 'var(--vscode-chat-font-size, 13px)' }}>
+          {currentSessionTitle}
+        </span>
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          viewBox="0 0 20 20"
+          fill="currentColor"
+          aria-hidden="true"
+          className="w-3.5 h-3.5"
+        >
+          <path
+            fillRule="evenodd"
+            d="M5.22 8.22a.75.75 0 0 1 1.06 0L10 11.94l3.72-3.72a.75.75 0 1 1 1.06 1.06l-4.25 4.25a.75.75 0 0 1-1.06 0L5.22 9.28a.75.75 0 0 1 0-1.06Z"
+            clipRule="evenodd"
+          ></path>
+        </svg>
+      </span>
+    </button>
+
+    {/* Spacer */}
+    <div className="flex-1"></div>
+
+    {/* Save Session Button */}
+    {/* <button
+        className="flex-none p-0 bg-transparent border border-transparent rounded cursor-pointer flex items-center justify-center outline-none w-6 h-6 hover:bg-[var(--app-ghost-button-hover-background)] focus:bg-[var(--app-ghost-button-hover-background)]"
+        style={{
+          color: 'var(--app-primary-foreground)',
+        }}
+        onClick={onSaveSession}
+        title="Save Conversation"
+      >
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          viewBox="0 0 20 20"
+          fill="currentColor"
+          aria-hidden="true"
+          data-slot="icon"
+          className="w-4 h-4"
+        >
+          <path
+            fillRule="evenodd"
+            d="M4.25 2A2.25 2.25 0 0 0 2 4.25v11.5A2.25 2.25 0 0 0 4.25 18h11.5A2.25 2.25 0 0 0 18 15.75V8.25a.75.75 0 0 1 .217-.517l.083-.083a.75.75 0 0 1 1.061 0l2.239 2.239A.75.75 0 0 1 22 10.5v5.25a4.75 4.75 0 0 1-4.75 4.75H4.75A4.75 4.75 0 0 1 0 15.75V4.25A4.75 4.75 0 0 1 4.75 0h5a.75.75 0 0 1 0 1.5h-5ZM9.017 6.5a1.5 1.5 0 0 1 2.072.58l.43.862a1 1 0 0 0 .895.558h3.272a1.5 1.5 0 0 1 1.5 1.5v6.75a1.5 1.5 0 0 1-1.5 1.5h-7.5a1.5 1.5 0 0 1-1.5-1.5v-6.75a1.5 1.5 0 0 1 1.5-1.5h1.25a1 1 0 0 0 .895-.558l.43-.862a1.5 1.5 0 0 1 .511-.732ZM11.78 8.47a.75.75 0 0 0-1.06-1.06L8.75 9.379 7.78 8.41a.75.75 0 0 0-1.06 1.06l1.5 1.5a.75.75 0 0 0 1.06 0l2.5-2.5Z"
+            clipRule="evenodd"
+          ></path>
+        </svg>
+      </button> */}
+
+    {/* New Session Button */}
+    <button
+      className="flex-none p-0 bg-transparent border border-transparent rounded cursor-pointer flex items-center justify-center outline-none w-6 h-6 hover:bg-[var(--app-ghost-button-hover-background)] focus:bg-[var(--app-ghost-button-hover-background)]"
+      style={{
+        color: 'var(--app-primary-foreground)',
+      }}
+      onClick={onNewSession}
+      title="New Session"
+    >
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        viewBox="0 0 20 20"
+        fill="currentColor"
+        aria-hidden="true"
+        data-slot="icon"
+        className="w-4 h-4"
+      >
+        <path d="M10.75 4.75a.75.75 0 0 0-1.5 0v4.5h-4.5a.75.75 0 0 0 0 1.5h4.5v4.5a.75.75 0 0 0 1.5 0v-4.5h4.5a.75.75 0 0 0 0-1.5h-4.5v-4.5Z"></path>
+      </svg>
+    </button>
+  </div>
+);