update

frontend/src/contexts/ThemeContext.tsx

@@ -1,4 +1,4 @@
-import React, { createContext, useContext, useState, useEffect, useMemo } from 'react';
+import React, { createContext, useContext, useState, useEffect, useMemo, useCallback } from 'react';
 import { ThemeProvider } from '@mui/material/styles';
 import { CssBaseline } from '@mui/material';
 import { lightTheme, darkTheme } from '../theme/theme';
@@ -50,10 +50,10 @@ export const ThemeModeProvider: React.FC<{ children: React.ReactNode }> = ({ chi
     return () => mq.removeEventListener('change', handler);
   }, []);
 
-  const setThemeMode = (mode: ThemeMode) => {
+  const setThemeMode = useCallback((mode: ThemeMode) => {
     setThemeModeState(mode);
     localStorage.setItem(STORAGE_KEY, mode);
-  };
+  }, []);
 
   const resolvedMode: 'light' | 'dark' =
     themeMode === 'system' ? systemPreference : themeMode;