MVP

frontend/src/context/ThemeContext.tsx

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+import React, { createContext, useContext, useEffect, useState } from 'react';
+
+type Theme = 'light' | 'dark';
+
+interface ThemeContextType {
+  theme: Theme;
+  toggleTheme: () => void;
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+export const ThemeProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
+  const [theme, setTheme] = useState<Theme>(() => {
+    const savedTheme = localStorage.getItem('theme');
+    return (savedTheme as Theme) || 'light';
+  });
+
+  useEffect(() => {
+    console.log('Theme changed to:', theme);
+    localStorage.setItem('theme', theme);
+    if (theme === 'dark') {
+      document.documentElement.classList.add('dark');
+      console.log('Added dark class, classList:', document.documentElement.classList.toString());
+    } else {
+      document.documentElement.classList.remove('dark');
+    }
+  }, [theme]);
+
+  const toggleTheme = () => {
+    console.log('Toggling theme');
+    setTheme((prev) => (prev === 'light' ? 'dark' : 'light'));
+  };
+
+  return (
+    <ThemeContext.Provider value={{ theme, toggleTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+};
+
+export const useTheme = () => {
+  const context = useContext(ThemeContext);
+  if (context === undefined) {
+    throw new Error('useTheme must be used within a ThemeProvider');
+  }
+  return context;
+};