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/api/extend.post.ts

@@ -98,7 +98,7 @@ export default defineEventHandler(async (event) => {
     extendTmpDir: tmpDir,
     extendPart1Path: part1Path,
     extendSourceClipId: source.id,
-    familyId: crypto.randomUUID(),
+    familyId: source.familyId || crypto.randomUUID(),
     parentClipId: source.id,
     chainIndex: (source.chainIndex || 0) + 1
   }