Keep the Extend panel put and name sibling clips as branches.

A finished job no longer closes a draft or jumps the page, and a second extend from the same part saves as p8b instead of another p8.

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

server/utils/extendChain.ts

@@ -12,7 +12,7 @@ import {
   clipVideoPath,
   extendTempDir,
   getClip,
-  nextClipPartName,
+  nextFamilyPartName,
   removeExtendTemp
 } from '~/server/utils/library'
 import { extractLastFrame, probeHasAudio } from '~/server/utils/ffmpeg'
@@ -63,6 +63,7 @@ export async function beginExtendFromClip(params: {
   duration?: number
   loraStack?: unknown
   folderLocked?: boolean
+  name?: string
 }) {
   const source = getClip(params.ownerKey, params.clipId)
   const sourcePath = clipVideoPath(params.ownerKey, source.id)
@@ -104,7 +105,7 @@ export async function beginExtendFromClip(params: {
   const length = frameLength(durationSeconds, fps)
   const width = source.width || 1344
   const height = source.height || 768
-  const clipName = nextClipPartName(clipTitle(source))
+  const clipName = String(params.name || '').trim() || nextFamilyPartName(params.ownerKey, source)
 
   const job = createJob()
   job.kind = 'video'