add: preparation page setup

src/app/prepare/layout.tsx

@@ -0,0 +1,18 @@
+import Nav from "@/components/window/Nav"
+
+export default function BaseLayout({ children }: { children: React.ReactNode }) {
+  return (
+    <div className="bg-[#f1f0f2] h-full w-full">
+      <Nav />
+
+      <div className="flex flex-col w-full h-full">
+        <main
+          className="bg-[#f1f0f2] h-screen w-full flex flex-col gap-6 p-6 items-center justify-center"
+          data-tauri-drag-region
+        >
+          {children}
+        </main>
+      </div>
+    </div>
+  )
+}