chore(favicon): set up favicon and web manifest

Place icon assets using Next.js file conventions (favicon.ico, icon.png,
apple-icon.png in src/app/) and add a typed manifest.ts for PWA icons.

Co-authored-by: Ona <no-reply@ona.com>

Author: zacharias-ona

public/android-chrome-192x192.png

@@ -0,0 +1,25 @@
+import type { MetadataRoute } from "next";
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: "Memo",
+    short_name: "Memo",
+    description: "A Notion-style workspace, built with zero human code.",
+    start_url: "/",
+    display: "standalone",
+    background_color: "#ffffff",
+    theme_color: "#ffffff",
+    icons: [
+      {
+        src: "/android-chrome-192x192.png",
+        sizes: "192x192",
+        type: "image/png",
+      },
+      {
+        src: "/android-chrome-512x512.png",
+        sizes: "512x512",
+        type: "image/png",
+      },
+    ],
+  };
+}