fix: prevent multiple initialization and state race condition in PopoutPage

- Use useRef to prevent multiple initializations
- Remove selectFile call that may cause state race condition
- Directly update store without selectFile to preserve isEditing state

src/pages/PopoutPage.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useState } from 'react'
+import { useEffect, useState, useRef } from 'react'
 import { useSearchParams } from 'react-router-dom'
 import type { FileItemDTO } from '@shared/types/file'
 import { matchModule } from '@/lib/module-registry'
@@ -11,15 +11,14 @@ import { useTabStore } from '@/stores'
 export const PopoutPage = () => {
   const [searchParams] = useSearchParams()
   const [file, setFile] = useState<FileItemDTO | null>(null)
-  const [content, setContent] = useState<string>('')
-  const [unsavedContent, setUnsavedContent] = useState<string>('')
-  const [isEditing, setIsEditing] = useState(false)
   const [isMaximized, setIsMaximized] = useState(false)
   const [ready, setReady] = useState(false)
-
-  const { selectFile } = useTabStore()
+  const initializedRef = useRef(false)
 
   useEffect(() => {
+    if (initializedRef.current) return
+    initializedRef.current = true
+
     const path = searchParams.get('path')
     const name = searchParams.get('name')
     const contentParam = searchParams.get('content')
@@ -36,55 +35,61 @@ export const PopoutPage = () => {
     const decodedUnsaved = unsavedParam ? decodeURIComponent(unsavedParam) : decodedContent
     const decodedEditing = editingParam === 'true'
 
-    setFile({
+    const fileObj: FileItemDTO = {
       name: decodedName,
       path: decodedPath,
       type: 'file',
       size: 0,
       modified: new Date().toISOString(),
-    })
-    setContent(decodedContent)
-    setUnsavedContent(decodedUnsaved)
-    setIsEditing(decodedEditing)
+    }
 
-    useTabStore.setState((state) => {
-      const newTabs = new Map(state.tabs)
-      newTabs.set(decodedPath, {
-        file: {
-          name: decodedName,
-          path: decodedPath,
-          type: 'file' as const,
-          size: 0,
-          modified: new Date().toISOString(),
-        },
-        content: decodedContent,
-        unsavedContent: decodedUnsaved,
-        isEditing: decodedEditing,
-        loading: false,
-        loaded: true,
+    setFile(fileObj)
+
+    const existingTab = useTabStore.getState().tabs.get(decodedPath)
+    if (!existingTab) {
+      useTabStore.setState((state) => {
+        const newTabs = new Map(state.tabs)
+        newTabs.set(decodedPath, {
+          file: fileObj,
+          content: decodedContent,
+          unsavedContent: decodedUnsaved,
+          isEditing: decodedEditing,
+          loading: false,
+          loaded: true,
+        })
+        return {
+          tabs: newTabs,
+          activeTabId: decodedPath,
+        }
       })
-      return {
-        tabs: newTabs,
-        activeTabId: decodedPath,
-      }
-    })
-
-    selectFile({
-      name: decodedName,
-      path: decodedPath,
-      type: 'file',
-      size: 0,
-      modified: new Date().toISOString(),
-    })
-
-    setReady(true)
+    } else {
+      useTabStore.setState((state) => {
+        const newTabs = new Map(state.tabs)
+        const existing = newTabs.get(decodedPath)
+        if (existing) {
+          newTabs.set(decodedPath, {
+            ...existing,
+            content: decodedContent,
+            unsavedContent: decodedUnsaved,
+            isEditing: decodedEditing,
+            loaded: true,
+          })
+        }
+        return {
+          tabs: newTabs,
+          activeTabId: decodedPath,
+        }
+      })
+    }
 
     window.electronAPI?.windowIsMaximized().then((result) => {
       if (result.success) {
         setIsMaximized(result.isMaximized)
       }
     })
-  }, [searchParams, selectFile])
+
+    setReady(true)
+  }, [searchParams])
 
   const handleMinimize = () => {
     window.electronAPI?.windowMinimize()