修复: DeepSeek 400 全量扫描 + 队列 per-conv 隔离

- openai_compat: 扫描所有 assistant 消息剥离 orphan tool_calls（原仅查末条）
- queue 加 conversationId 字段，按会话精准 drain
- regenerate/editMessage 只清本会话排队消息
- newConversation 保留旧会话排队消息
- AiError 只清出错会话的队列项

src/composables/ai/useAiSend.ts

@@ -24,7 +24,7 @@ import { t } from '@/i18n/i18n-helpers'
 import { resetStreamWatchdog, clearStreamWatchdog } from './useAiStream'
 import { setStreaming } from './streamingGuard'
 import { startListener } from './useAiEvents'
-import { nextMsgId, startApprovalTimer, clearApprovalTimer, clearAllApprovalTimers, resolveAiLang } from './aiShared'
+import { nextMsgId, startApprovalTimer, clearApprovalTimer, clearAllApprovalTimers, resolveAiLang, convStates } from './aiShared'
 
 /// 待发送队列上限（超过抛错提示用户）
 const QUEUE_LIMIT = 10
@@ -90,7 +90,6 @@ async function doSend(text: string, skill?: string, force = false, parts?: Conte
     content: '',
     timestamp: Date.now(),
   })
-
   setStreaming(true, { convId: state.activeConversationId, reason: 'doSend' })
   state.currentText = ''
   resetStreamWatchdog() // 启动流式看门狗,无数据超时兜底
@@ -112,8 +111,11 @@ async function doSend(text: string, skill?: string, force = false, parts?: Conte
   } catch (e) {
     // IPC 失败(spawn 前/provider 配置错等):回滚 streaming 防光标卡死 + 移除 user 消息与空气泡占位;
     // 重新抛出由 handleSend 回填输入框,用户可重试
-    setStreaming(false, { convId: state.activeConversationId, reason: 'doSend-ipc-fail' })
-    clearStreamWatchdog() // 清看门狗,防 130s 后 onStreamTimeout 误推错误气泡
+    // BUG-2026-07-17:彻底清理 convStates,避免按钮永久红色
+    const convId = state.activeConversationId
+    setStreaming(false, { convId, reason: 'doSend-ipc-fail' })
+    clearStreamWatchdog(convId || undefined)
+    if (convId) convStates.delete(convId)
     state.messages = state.messages.filter(m => m.id !== aiMsgId && m.id !== userMsgId)
     throw e
   }
@@ -149,7 +151,9 @@ async function regenerate() {
 
   setStreaming(true, { convId: state.activeConversationId, reason: 'regenerate' })
   state.currentText = ''
-  state.queue = [] // 重生成视同新发,清残留队列
+  // 只清当前会话的排队消息,不误伤其他会话
+  const regenConvId = state.activeConversationId
+  state.queue = state.queue.filter(q => q.conversationId !== regenConvId)
   resetStreamWatchdog()
 
   await startListener()
@@ -219,7 +223,9 @@ async function editMessage(newMessage: string) {
 
   setStreaming(true, { convId: state.activeConversationId, reason: 'editMessage' })
   state.currentText = ''
-  state.queue = [] // 编辑重生成视同新发,清残留队列
+  // 只清当前会话的排队消息,不误伤其他会话
+  const editConvId = state.activeConversationId
+  state.queue = state.queue.filter(q => q.conversationId !== editConvId)
   resetStreamWatchdog()
 
   await startListener()
@@ -251,15 +257,22 @@ async function editMessage(newMessage: string) {
  * 回填失败消息到队首并停 drain(不静默丢用户输入,保留剩余队列供手动重试/编辑/取消)。
  * 成功路径不受影响——doSend 成功后端会再 emit AiCompleted 续 drain 链路。
  */
-export function drainQueue() {
+export function drainQueue(convId?: string | null) {
   if (state.queue.length === 0) return
-  const next = state.queue.shift()!
+  // 找队首属于目标 conv 的消息;若穿越(非当前 conv 的项堵在队首)则跳过整条队列
+  const targetId = convId ?? state.activeConversationId
+  const idx = state.queue.findIndex(q => q.conversationId === targetId)
+  if (idx === -1) return
+  const next = state.queue.splice(idx, 1)[0]!
+  const activeConvId = state.activeConversationId
   void (async () => {
     try {
       await sendMessage(next.text, next.skill, false, next.parts)
     } catch (e) {
-      setStreaming(false, { convId: state.activeConversationId, reason: 'drainQueue-fail' })
-      clearStreamWatchdog()
+      // BUG-2026-07-17: 失败时彻底收尾,带 convId 精准清理 per-conv watchdog + convStates
+      setStreaming(false, { convId: activeConvId, reason: 'drainQueue-fail' })
+      clearStreamWatchdog(activeConvId || undefined)
+      if (activeConvId) convStates.delete(activeConvId)
       const errMsg = e instanceof Error ? e.message : String(e)
       state.queue.unshift(next) // 回填失败消息到队首,保留剩余队列(不静默丢用户输入)
       state.messages.push({
@@ -313,12 +326,14 @@ async function sendMessage(text: string, skill?: string, forceMode = false, part
       throw new Error(t('ai.queueFull', { limit: QUEUE_LIMIT }))
     }
     setStreaming(true, { convId: state.activeConversationId, reason: 'L1-enqueue' })
-    // F-260614-05 Phase 2b: 入队项挂 parts(供 drainQueue 续发时本地 user 消息渲染图)
+    // F-260614-05 Phase 2b: 入队项挂 parts(供 drainQueue/续发时本地 user 消息渲染图)
+    // 同时挂 conversationId,供 drainQueue 按会话精准续发(防跨会话串话)
     state.queue.push({
       text: text.trim(),
       skill: skill || undefined,
       enqueuedAt: Date.now(),
       parts: parts && parts.length > 0 ? parts : undefined,
+      conversationId: state.activeConversationId,
     })
     return
   }
@@ -481,5 +496,7 @@ export function useAiSend() {
 let _drainUnlisten: (() => void) | null = null
 export async function initDrainQueueListener(): Promise<void> {
   if (_drainUnlisten) return
-  _drainUnlisten = await listen('ai-drain-queue', () => { drainQueue() })
+  _drainUnlisten = await listen('ai-drain-queue', (event: any) => {
+    drainQueue(event?.payload?.conversationId ?? null)
+  })
 }