feat: add request form and live queue UI

web/src/app/page.tsx

@@ -1,3 +1,10 @@
+import { Queue } from "./queue";
+
 export default function Home() {
-  return <main>Lyra</main>;
+  return (
+    <main>
+      <h1>Lyra</h1>
+      <Queue />
+    </main>
+  );
 }

web/src/app/queue.tsx

@@ -0,0 +1,60 @@
+"use client";
+
+import { useEffect, useState } from "react";
+
+type Row = {
+  id: string;
+  artist: string;
+  album: string;
+  status: string;
+  job: { state: string; currentStage: string } | null;
+};
+
+export function Queue() {
+  const [rows, setRows] = useState<Row[]>([]);
+  const [artist, setArtist] = useState("");
+  const [album, setAlbum] = useState("");
+
+  async function refresh() {
+    const res = await fetch("/api/requests");
+    const body = await res.json();
+    setRows(body.requests);
+  }
+
+  useEffect(() => {
+    refresh();
+    const id = setInterval(refresh, 2000);
+    return () => clearInterval(id);
+  }, []);
+
+  async function submit(e: React.FormEvent) {
+    e.preventDefault();
+    if (!artist.trim() || !album.trim()) return;
+    await fetch("/api/requests", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ artist, album }),
+    });
+    setArtist("");
+    setAlbum("");
+    refresh();
+  }
+
+  return (
+    <div>
+      <form onSubmit={submit}>
+        <input aria-label="artist" placeholder="Artist" value={artist} onChange={(e) => setArtist(e.target.value)} />
+        <input aria-label="album" placeholder="Album" value={album} onChange={(e) => setAlbum(e.target.value)} />
+        <button type="submit">Request</button>
+      </form>
+      <ul>
+        {rows.map((r) => (
+          <li key={r.id}>
+            {r.artist} — {r.album} · <strong>{r.job?.state ?? r.status}</strong>
+            {r.job ? ` (${r.job.currentStage})` : ""}
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}