feat: convert app to PWA with offline support and service worker

app/manifest.ts

@@ -0,0 +1,29 @@
+import { MetadataRoute } from 'next';
+
+export const dynamic = 'force-static';
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: 'Kit - Creative Toolkit',
+    short_name: 'Kit',
+    description: 'A curated collection of creative and utility tools for developers and creators.',
+    start_url: '/',
+    display: 'standalone',
+    background_color: '#0a0a0f',
+    theme_color: '#8b5cf6',
+    icons: [
+      {
+        src: '/icon.png',
+        sizes: '512x512',
+        type: 'image/png',
+        purpose: 'any',
+      },
+      {
+        src: '/icon.png',
+        sizes: '512x512',
+        type: 'image/png',
+        purpose: 'maskable',
+      },
+    ],
+  };
+}