feat(web): add PWA manifest config (theme_color matches layout viewport)

web/app/manifest.ts

@@ -0,0 +1,18 @@
+import type { MetadataRoute } from "next";
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: "CM Bot V2",
+    short_name: "CM Bot",
+    description: "CM Bot account and user dashboard",
+    start_url: "/",
+    display: "standalone",
+    orientation: "portrait",
+    background_color: "#ffffff",
+    theme_color: "#facc15",
+    icons: [
+      { src: "/icon", sizes: "any", type: "image/png" },
+      { src: "/apple-icon", sizes: "180x180", type: "image/png" },
+    ],
+  };
+}