fix: validate JSON before applying AI result, show raw text on parse failure

editor/components/AIPanel.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, watch, nextTick } from 'vue'
+import { ref, nextTick } from 'vue'
 import { useEditorStore } from '../stores/editorStore'
 import { sendAIRequest } from '../composables/useAI'
 
@@ -12,10 +12,6 @@ const chatRef = ref<HTMLDivElement | null>(null)
 
 const mode = ref<'json' | 'code'>('json')
 
-watch(() => store.selectedNodeId, (id) => {
-  mode.value = id ? 'json' : 'code'
-}, { immediate: true })
-
 function toggleMode() {
   mode.value = mode.value === 'json' ? 'code' : 'json'
 }
@@ -37,12 +33,18 @@ async function send() {
   try {
     const { result, sessionId: newSid } = await sendAIRequest(msg, mode.value, store.deepseekKey, store.aiSessionId || undefined)
     if (newSid) store.setAISessionId(newSid)
-    messages.value.push({ role: 'assistant', content: mode.value === 'json' ? '已生成 JSON，请查看编辑器面板' : '代码已修改，请查看预览窗口' })
 
     if (mode.value === 'json') {
-      // Try to extract pure JSON
       const clean = result.replace(/^```json\n?|\n?```$/g, '').trim()
-      store.setAIResult(clean)
+      try {
+        JSON.parse(clean)
+        store.setAIResult(clean)
+        messages.value.push({ role: 'assistant', content: '已生成 JSON，请查看编辑器面板' })
+      } catch {
+        messages.value.push({ role: 'assistant', content: result })
+      }
+    } else {
+      messages.value.push({ role: 'assistant', content: result || '已完成' })
     }
   } catch (e: any) {
     errorMsg.value = e.message || '请求失败'