Stop ghost extension clips and recover last-frame extract after an interrupt.

Only one Comfy finish path can save a clip, hide catalog entries whose MP4 is missing, and retry last-frame extract so a truncated file does not dump FFmpeg noise into the UI.

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

server/utils/library.ts

@@ -317,7 +317,8 @@ export function publicLibrary(event: H3Event) {
     clips: catalog.clips.filter(clip => unlockedIds.has(clip.folderId)).map(clip => ({
       ...clip,
       name: clipTitle(clip),
-      hasThumbnail: !clip.hideThumbnail && existsSync(clipThumbPath(owner, clip.id))
+      hasThumbnail: !clip.hideThumbnail && existsSync(clipThumbPath(owner, clip.id)),
+      hasVideo: existsSync(clipVideoPath(owner, clip.id))
     })),
     stills: catalog.stills.filter(still => unlockedIds.has(still.folderId)),
     drafts: catalog.drafts