Initial frontend import

src/video.ts

@@ -0,0 +1,6 @@
+/** Path looks like a video file (upload or URL path). */
+export function isLikelyVideoPath(path: string | undefined | null): boolean {
+  if (!path) return false;
+  const p = path.split("?")[0].toLowerCase();
+  return /\.(mp4|webm|mov|m4v|mkv|ogv|avi)(\/)?$/i.test(p);
+}