feat: Initialize the Electron frontend with core UI components and integrate Convex backend services.

Frontend/Electron/src/contexts/ThemeContext.jsx

@@ -0,0 +1,42 @@
+import React, { createContext, useContext, useState, useEffect } from 'react';
+
+const STORAGE_KEY = 'discord-theme';
+
+export const THEMES = {
+  LIGHT: 'theme-light',
+  DARK: 'theme-dark',
+  ASH: 'theme-darker',
+  ONYX: 'theme-midnight',
+};
+
+export const THEME_LABELS = {
+  [THEMES.LIGHT]: 'Light',
+  [THEMES.DARK]: 'Dark',
+  [THEMES.ASH]: 'Ash',
+  [THEMES.ONYX]: 'Onyx',
+};
+
+const ThemeContext = createContext();
+
+export function ThemeProvider({ children }) {
+  const [theme, setTheme] = useState(() => {
+    return localStorage.getItem(STORAGE_KEY) || THEMES.DARK;
+  });
+
+  useEffect(() => {
+    document.documentElement.className = theme;
+    localStorage.setItem(STORAGE_KEY, theme);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme, THEMES, THEME_LABELS }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme() {
+  const ctx = useContext(ThemeContext);
+  if (!ctx) throw new Error('useTheme must be used within ThemeProvider');
+  return ctx;
+}