feat: scaffold Tauri + React + Tailwind v4

src/App.tsx

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+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>
+  );
+}

src/index.css

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+@import "tailwindcss";
+
+@theme {
+  --color-ink: #0f0f0f;
+  --color-surface: #181818;
+  --color-raised: #212121;
+  --color-edge: #303030;
+  --color-muted: #aaaaaa;
+  --color-accent: #3ea6ff;
+}
+
+html, body, #root { height: 100%; }
+body { margin: 0; background: var(--color-ink); color: #fff;
+  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
+::-webkit-scrollbar { width: 10px; }
+::-webkit-scrollbar-thumb { background: var(--color-edge); border-radius: 5px; }

src/main.tsx

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+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+import "./index.css";
+
+ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);

src/vite-env.d.ts

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+/// <reference types="vite/client" />