之前是会话tab激活的会话不被空闲回收，现在改为会话tab所有的会话都不被空闲回收

src/contexts/acp-connections-context.tsx

@@ -1082,6 +1082,7 @@ export interface AcpActionsValue {
   ): Promise<void>
   setActiveKey(key: string | null): void
   touchActivity(contextKey: string): void
+  registerOpenTabKeys(keys: Set<string>): void
 }
 
 const AcpActionsContext = createContext<AcpActionsValue | null>(null)
@@ -1147,6 +1148,9 @@ export function AcpConnectionsProvider({ children }: { children: ReactNode }) {
   // connectionId → contextKey reverse mapping
   const reverseMapRef = useRef(new Map<string, string>())
 
+  // Open tab keys — updated by child TabProvider via registerOpenTabKeys
+  const openTabKeysRef = useRef(new Set<string>())
+
   // Guard against concurrent connect() calls
   const connectingKeysRef = useRef(new Set<string>())
   // Keys whose disconnect was requested while connect was still in flight
@@ -1309,6 +1313,10 @@ export function AcpConnectionsProvider({ children }: { children: ReactNode }) {
     lastActivityRef.current.set(contextKey, Date.now())
   }, [])
 
+  const registerOpenTabKeys = useCallback((keys: Set<string>) => {
+    openTabKeysRef.current = keys
+  }, [])
+
   const flushStreamingQueue = useCallback(() => {
     flushTimerRef.current = null
     const queued = streamingQueueRef.current
@@ -1649,9 +1657,11 @@ export function AcpConnectionsProvider({ children }: { children: ReactNode }) {
       const now = Date.now()
       const currentActiveKey = storeRef.current.activeKey
 
+      const currentOpenTabKeys = openTabKeysRef.current
       const toDisconnect: { contextKey: string; connectionId: string }[] = []
       for (const [contextKey, conn] of storeRef.current.connections) {
         if (contextKey === currentActiveKey) continue
+        if (currentOpenTabKeys.has(contextKey)) continue
         if (
           conn.status === "prompting" ||
           conn.status === "connecting" ||
@@ -1923,6 +1933,7 @@ export function AcpConnectionsProvider({ children }: { children: ReactNode }) {
       respondPermission,
       setActiveKey,
       touchActivity,
+      registerOpenTabKeys,
     }),
     [
       connect,
@@ -1935,6 +1946,7 @@ export function AcpConnectionsProvider({ children }: { children: ReactNode }) {
       respondPermission,
       setActiveKey,
       touchActivity,
+      registerOpenTabKeys,
     ]
   )