💄 style(AIAgentsPage): update icons for AI agents

- replace RobotIcon with CpuChipIcon in empty state display
- update message role icon from RobotIcon to CpuChipIcon for AI responses

src/client/mobile/pages/AIAgentsPage.tsx

@@ -9,7 +9,7 @@ import {
   PaperAirplaneIcon,
   ArrowLeftIcon,
   UserIcon,
-  RobotIcon
+  CpuChipIcon
 } from '@heroicons/react/24/outline';
 
 // 类型定义
@@ -208,7 +208,7 @@ const AIAgentsPage: React.FC = () => {
         
         <div className="flex items-center justify-center h-64">
           <div className="text-center">
-            <RobotIcon className="w-16 h-16 mx-auto mb-4" style={{ color: COLORS.ink.dark }} />
+            <CpuChipIcon className="w-16 h-16 mx-auto mb-4" style={{ color: COLORS.ink.dark }} />
             <p style={{ color: COLORS.text.secondary }}>暂无可用智能体</p>
           </div>
         </div>
@@ -310,7 +310,7 @@ const AIAgentsPage: React.FC = () => {
                   {message.role === 'user' ? (
                     <UserIcon className="w-3 h-3 mr-1" />
                   ) : (
-                    <RobotIcon className="w-3 h-3 mr-1" />
+                    <CpuChipIcon className="w-3 h-3 mr-1" />
                   )}
                   <span>{message.timestamp.toLocaleTimeString()}</span>
                 </div>