feat: wire MCPAppRenderer into ChatPanel for MCP App tool results

frontend/src/components/ChatPanel.tsx

@@ -3,6 +3,7 @@ import type { KeyboardEvent } from 'react'
 import ReactMarkdown from 'react-markdown'
 import { IconSend } from '@tabler/icons-react'
 import { ToolCallCard } from './ToolCallCard'
+import { MCPAppRenderer } from './MCPAppRenderer'
 import type { ChatMessage } from '../hooks/useChat'
 
 interface ChatPanelProps {
@@ -61,9 +62,19 @@ export function ChatPanel({ messages, isStreaming, onSend, sessionId }: ChatPane
             {message.role === 'assistant' ? (
               <div>
                 <ReactMarkdown>{message.content}</ReactMarkdown>
-                {message.toolCalls?.map(tc => (
-                  <ToolCallCard key={tc.id} toolCall={tc} />
-                ))}
+                {message.toolCalls?.map(tc =>
+                  tc._meta?.ui?.resourceUri ? (
+                    <MCPAppRenderer
+                      key={tc.id}
+                      resourceUri={tc._meta.ui.resourceUri}
+                      data={tc.structuredContent ?? {}}
+                      csp={tc._meta.ui.csp}
+                      onSendMessage={(content) => onSend(content)}
+                    />
+                  ) : (
+                    <ToolCallCard key={tc.id} toolCall={tc} />
+                  )
+                )}
               </div>
             ) : (
               <div>{message.content}</div>