Align preview typography with FFmpeg output, add video/song title split, and ship OSS updates.

Separate YouTube video titles from on-video song/artist fields with Pro gating, serve curated fonts and watermark assets for 1:1 preview parity, and include billing/API/docs/deploy stack for self-hosted release.

components/YouTubeLimitBanner.tsx

@@ -0,0 +1,16 @@
+import { YOUTUBE_UPLOAD_LIMIT_USER_MESSAGE } from "@/lib/youtube/errors";
+
+type Props = {
+  className?: string;
+};
+
+export function YouTubeLimitBanner({ className = "" }: Props) {
+  return (
+    <div
+      className={`rounded border border-amber-500/40 bg-amber-500/10 px-4 py-3 text-sm text-amber-100 ${className}`}
+    >
+      <p className="font-medium text-amber-200">YouTube upload limit reached</p>
+      <p className="mt-1 text-amber-100/90">{YOUTUBE_UPLOAD_LIMIT_USER_MESSAGE}</p>
+    </div>
+  );
+}