feat: Add Dark Theme Support

src/hooks/useTheme.ts

@@ -0,0 +1,18 @@
+import { useEffect } from 'react';
+import { useAppStore } from '@/store';
+
+export function useTheme() {
+  const theme = useAppStore(state => state.theme);
+  const setTheme = useAppStore(state => state.setTheme);
+
+  useEffect(() => {
+    const root = document.documentElement;
+    if (theme === 'dark') {
+      root.classList.add('dark');
+    } else {
+      root.classList.remove('dark');
+    }
+  }, [theme]);
+
+  return { theme, setTheme };
+}