feat: scaffold Tauri + React + Tailwind v4

src/App.tsx

@@ -0,0 +1,7 @@
+export default function App() {
+  return (
+    <div className="min-h-screen bg-ink text-white grid place-items-center">
+      <h1 className="text-3xl font-semibold tracking-tight">FlightTube</h1>
+    </div>
+  );
+}