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/library.ts

@@ -18,6 +18,9 @@ import {
   type KeepPromptKind,
   type KeepPromptLists
 } from '~/utils/keepPrompts'
+import { familyBaseName, nextClipPartName, clipPartLabel } from '~/utils/libraryBrowse'
+
+export { familyBaseName, nextClipPartName, clipPartLabel }
 
 const scryptAsync = promisify(scrypt)
 
@@ -327,18 +330,10 @@ export function clipTitle(clip: Pick<LibraryClip, 'name' | 'prompt'>) {
   return fromPrompt || 'Untitled clip'
 }
 
-export function familyBaseName(name: string) {
-  return String(name || '').trim().replace(/\s+p\d+$/i, '')
-}
-
-export function nextClipPartName(name: string) {
-  const trimmed = (name || '').trim()
-  if (!trimmed) return ''
-  const match = trimmed.match(/^(.*)\s+p(\d+)$/i)
-  const base = (match ? match[1] : trimmed).trim() || trimmed
-  const part = match ? Number(match[2]) + 1 : 2
-  const suffix = ` p${part}`
-  return `${base.slice(0, Math.max(1, 80 - suffix.length))}${suffix}`
+export function nextFamilyPartName(owner: string, source: LibraryClip, extraNames: string[] = []) {
+  const catalog = readCatalog(owner)
+  const family = clipsInSameFamily(catalog, source)
+  return nextClipPartName(clipTitle(source), [...family.map(item => clipTitle(item)), ...extraNames])
 }
 
 export function sortFamilyParts(a: LibraryClip, b: LibraryClip) {