Group extension chains in the library and add shot-script queues.

Keep every saved segment, show the longest clip with an expand list, branch on extend, and parse shot 2/3 blocks into a shared-duration queue with live part status.

server/utils/library.ts

@@ -34,6 +34,10 @@ export interface LibraryClip {
   fps?: number
   samplerName?: string
   scheduler?: string
+  duration?: number
+  familyId?: string
+  parentClipId?: string
+  chainIndex?: number
 }
 
 export interface LibraryStill {
@@ -800,6 +804,10 @@ export async function saveClip(params: {
   fps?: number
   samplerName?: string
   scheduler?: string
+  duration?: number
+  familyId?: string
+  parentClipId?: string
+  chainIndex?: number
 }) {
   const catalog = readCatalog(params.ownerKey)
   const folder = catalog.folders.find(item => item.id === params.folderId) || catalog.folders[0]
@@ -821,10 +829,23 @@ export async function saveClip(params: {
     cfg: params.cfg,
     fps: params.fps,
     samplerName: params.samplerName,
-    scheduler: params.scheduler
+    scheduler: params.scheduler,
+    familyId: params.familyId,
+    parentClipId: params.parentClipId,
+    chainIndex: params.chainIndex
   }
   mkdirSync(clipDir(params.ownerKey, clip.id), { recursive: true })
-  writeFileSync(clipVideoPath(params.ownerKey, clip.id), params.video)
+  const videoPath = clipVideoPath(params.ownerKey, clip.id)
+  writeFileSync(videoPath, params.video)
+  if (typeof params.duration === 'number' && params.duration > 0) {
+    clip.duration = params.duration
+  } else {
+    try {
+      clip.duration = await probeDuration(videoPath)
+    } catch {
+      /* duration stays unset */
+    }
+  }
   if (params.thumb?.length) {
     writeFileSync(join(clipDir(params.ownerKey, clip.id), 'thumb'), params.thumb)
   } else {