优化: aichat 打磨收尾(切换信任保留 + save并发串行 + 后台授权守卫 + 分离窗口失效 + 气泡截图复制)

src/composables/ai/useAiWindow.ts

@@ -204,12 +204,21 @@ export async function restoreGeneratingState(opts?: { fromMainPanel?: boolean; c
   if (!fromMainPanel) {
     state.currentText = (opts?.convId && localStorage.getItem(textKey(opts.convId))) || localStorage.getItem('df-ai-text') || ''
   }
-  state.messages.push({
-    id: `ai-${nextMsgId()}` as MessageId,
-    role: 'assistant',
-    content: '',
-    timestamp: Date.now(),
-  })
+  // 双占位去重:末条已是空 assistant 占位(本会话流式占位)则复用,不重复 push。
+  const lastMsg = state.messages[state.messages.length - 1]
+  const lastIsStreamingPlaceholder = !!lastMsg
+    && lastMsg.role === 'assistant'
+    && !lastMsg.content?.trim()
+    && !lastMsg.isError
+    && !(lastMsg.toolCalls && lastMsg.toolCalls.length)
+  if (!lastIsStreamingPlaceholder) {
+    state.messages.push({
+      id: `ai-${nextMsgId()}` as MessageId,
+      role: 'assistant',
+      content: '',
+      timestamp: Date.now(),
+    })
+  }
   setStreaming(true, { convId: gen, reason: 'restoreGeneratingState' })
   // 批4 双轨收口:恢复生成中态写 convStates(enum 真相源),替代旧 generatingConvs.add。
   // setStreaming 联动已退役(批4),streaming 单值与 convStates 项并行写无冲突。