Rewrite dashboard and overlay, single /events stream, static client served by the backend

Backend: one SSE stream for messages, selection, poll and connection status; reconnect with backoff; no on-disk Innertube session cache; mock only with MOCK_CHAT=1; binds to 127.0.0.1; serves client/out so production runs on one port. Full URLs for links YouTube truncates in chat.

Client: components split out, Lucide icons, stream title and status, on-air strip, search, pause, keyboard shortcuts, overlay settings dialog. Overlay themes, position, size, animation and auto-hide via URL, sized for 1080p and scaled with the source. New blueprint theme for the brand background.

Removed Tailwind, better-sqlite3, zod, the timezone helpers, Cline memory bank and AGENTS.md. Added ESLint, node:test tests and CI.

client/components/ConnectForm.tsx

@@ -0,0 +1,43 @@
+'use client';
+
+import { Radio } from 'lucide-react';
+import { useState, type FormEvent } from 'react';
+
+type Props = {
+  busy: boolean;
+  error?: string | null;
+  onConnect: (liveId: string) => void;
+};
+
+export function ConnectForm({ busy, error, onConnect }: Props) {
+  const [value, setValue] = useState('');
+
+  const submit = (event: FormEvent) => {
+    event.preventDefault();
+    if (value.trim()) onConnect(value.trim());
+  };
+
+  return (
+    <div className="connect">
+      <form className="connect__card" onSubmit={submit}>
+        <span className="connect__icon">
+          <Radio size={22} />
+        </span>
+        <h1>Connect to a live stream</h1>
+        <p>Paste the video URL or the 11 character video id of a stream that is live now.</p>
+        <input
+          autoFocus
+          value={value}
+          onChange={(event) => setValue(event.target.value)}
+          placeholder="https://youtube.com/watch?v=…"
+          disabled={busy}
+          spellCheck={false}
+        />
+        {error && <p className="connect__error">{error}</p>}
+        <button type="submit" className="btn btn--primary" disabled={busy || !value.trim()}>
+          {busy ? 'Connecting…' : 'Connect'}
+        </button>
+      </form>
+    </div>
+  );
+}