Fix library thumbnails and let clips keep a display name.

Extract a poster frame when a still-thumb is missing, and show the clip name in the library with the prompt on the info icon.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/watch.ts

@@ -60,6 +60,7 @@ export function watchComfyJob(job: Job): Promise<void> {
           const clip = await saveClip({
             ownerKey: job.library.ownerKey,
             folderId: job.library.folderId,
+            name: job.library.name,
             prompt: job.library.prompt,
             aspect: job.library.aspect,
             width: job.library.width,