优化folder打开逻辑

src/contexts/folder-context.tsx

@@ -11,7 +11,8 @@ import {
   type ReactNode,
 } from "react"
 import { toErrorMessage } from "@/lib/app-error"
-import { getFolder, listFolderConversations } from "@/lib/api"
+import { getFolder, listFolderConversations, closeFolderWindow } from "@/lib/api"
+import { isDesktop } from "@/lib/transport"
 import type {
   AgentType,
   AgentStats,
@@ -195,6 +196,22 @@ export function FolderProvider({
     }
   }, [])
 
+  // Web mode: register this tab's name so that window.open(url, "folder-{id}")
+  // from other pages can find and reuse it instead of opening duplicates.
+  // Also notify backend when the folder tab closes.
+  useEffect(() => {
+    if (isDesktop() || !folderId) return
+
+    window.name = `folder-${folderId}`
+
+    const onUnload = () => closeFolderWindow(folderId)
+    window.addEventListener("pagehide", onUnload)
+
+    return () => {
+      window.removeEventListener("pagehide", onUnload)
+    }
+  }, [folderId])
+
   const selectConversation = useCallback((id: number, agentType: AgentType) => {
     setSelectedConversation({ id, agentType })
     setNewConversation(null)