fix: Resolve infinite render loop by memoizing context functions and values

frontend/src/App.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect, createContext, useContext } from "react"
+import { useState, useEffect, createContext, useContext, useMemo, useCallback } from "react"
 import { Routes, Route } from "react-router-dom"
 import { MainLayout } from "./components/layout/MainLayout"
 import { LoginForm } from "./components/auth/LoginForm"
@@ -25,8 +25,15 @@ function AuthProvider({ children }: { children: React.ReactNode }) {
   const [isAuthenticated, setIsAuthenticated] = useState(false)
   const [user, setUser] = useState<UserResponse | null>(null)
 
+  const value = useMemo(() => ({
+    isAuthenticated,
+    setIsAuthenticated,
+    user,
+    setUser
+  }), [isAuthenticated, user])
+
   return (
-    <AuthContext.Provider value={{ isAuthenticated, setIsAuthenticated, user, setUser }}>
+    <AuthContext.Provider value={value}>
       {children}
     </AuthContext.Provider>
   )
@@ -81,16 +88,16 @@ function AppContent() {
     initAuth()
   }, [setIsAuthenticated, setThemeLocal, setUser])
 
-  const loadHistory = async () => {
+  const loadHistory = useCallback(async () => {
     try {
       const history = await ChatService.listConversations()
       setConversations(history)
     } catch (err) {
       console.error("Failed to load conversation history:", err)
     }
-  }
+  }, [])
 
-  const handleAuthSuccess = async () => {
+  const handleAuthSuccess = useCallback(async () => {
     try {
       const userData = await AuthService.getMe()
       setUser(userData)
@@ -102,9 +109,9 @@ function AppContent() {
     } catch (err: unknown) {
       console.error("Failed to fetch user profile after login:", err)
     }
-  }
+  }, [setUser, setIsAuthenticated, setThemeLocal, loadHistory])
 
-  const handleLogout = async () => {
+  const handleLogout = useCallback(async () => {
     try {
       await AuthService.logout()
     } catch (err: unknown) {
@@ -117,9 +124,9 @@ function AppContent() {
       setThreadMessages({})
       setThemeLocal("light")
     }
-  }
+  }, [setIsAuthenticated, setUser, setThemeLocal])
 
-  const handleSelectConversation = async (id: string) => {
+  const handleSelectConversation = useCallback(async (id: string) => {
     setSelectedThreadId(id)
     try {
       const msgs = await ChatService.getMessages(id)
@@ -127,9 +134,9 @@ function AppContent() {
     } catch (err) {
       console.error("Failed to fetch messages:", err)
     }
-  }
+  }, [])
 
-  const handleCreateConversation = async () => {
+  const handleCreateConversation = useCallback(async () => {
     try {
       const newConv = await ChatService.createConversation()
       setConversations(prev => [newConv, ...prev])
@@ -138,18 +145,18 @@ function AppContent() {
     } catch (err) {
       console.error("Failed to create conversation:", err)
     }
-  }
+  }, [])
 
-  const handleRenameConversation = async (id: string, name: string) => {
+  const handleRenameConversation = useCallback(async (id: string, name: string) => {
     try {
       const updated = await ChatService.renameConversation(id, name)
       setConversations(prev => prev.map(c => c.id === id ? updated : c))
     } catch (err) {
       console.error("Failed to rename conversation:", err)
     }
-  }
+  }, [])
 
-  const handleDeleteConversation = async (id: string) => {
+  const handleDeleteConversation = useCallback(async (id: string) => {
     try {
       await ChatService.deleteConversation(id)
       setConversations(prev => prev.filter(c => c.id !== id))
@@ -164,11 +171,11 @@ function AppContent() {
     } catch (err) {
       console.error("Failed to delete conversation:", err)
     }
-  }
+  }, [selectedThreadId])
 
-  const handleMessagesFinal = (id: string, messages: MessageResponse[]) => {
+  const handleMessagesFinal = useCallback((id: string, messages: MessageResponse[]) => {
     setThreadMessages(prev => ({ ...prev, [id]: messages }))
-  }
+  }, [])
 
   const queryParams = new URLSearchParams(window.location.search)
   const externalError = queryParams.get("error")

frontend/src/components/theme-provider.tsx

@@ -1,4 +1,4 @@
-import { createContext, useContext, useEffect, useState } from "react"
+import { createContext, useContext, useEffect, useState, useCallback, useMemo } from "react"
 import { AuthService } from "@/services/auth"
 
 export type Theme = "light" | "dark"
@@ -29,7 +29,7 @@ export function ThemeProvider({
     root.classList.add(theme)
   }, [theme])
 
-  const setTheme = async (newTheme: Theme) => {
+  const setTheme = useCallback(async (newTheme: Theme) => {
     setThemeState(newTheme)
     if (isAuthenticated) {
       try {
@@ -38,18 +38,25 @@ export function ThemeProvider({
         console.error("Failed to sync theme to backend:", error)
       }
     }
-  }
+  }, [isAuthenticated])
 
-  const setThemeLocal = (newTheme: Theme) => {
+  const setThemeLocal = useCallback((newTheme: Theme) => {
     setThemeState(newTheme)
-  }
+  }, [])
 
-  const toggleTheme = () => {
+  const toggleTheme = useCallback(() => {
     setTheme(theme === "light" ? "dark" : "light")
-  }
+  }, [theme, setTheme])
+
+  const value = useMemo(() => ({
+    theme,
+    setTheme,
+    setThemeLocal,
+    toggleTheme
+  }), [theme, setTheme, setThemeLocal, toggleTheme])
 
   return (
-    <ThemeContext.Provider value={{ theme, setTheme, setThemeLocal, toggleTheme }}>
+    <ThemeContext.Provider value={value}>
       {children}
     </ThemeContext.Provider>
   )