Give video extensions the same pre-text, prompt, and post-text fields as the main form.

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

server/utils/videoChain.ts

@@ -22,7 +22,8 @@ import {
   updateShotQueue
 } from '~/server/utils/shotQueue'
 import { composeShotPrompt, allowIdentityRefs, type PermanenceRef } from '~/utils/globalLocks'
-import { composePromptParts } from '~/utils/promptParts'
+import { composePromptParts, resolvePromptWrappers } from '~/utils/promptParts'
+import type { QueuedExtension } from '~/server/utils/library'
 import { persistLoraFields, ensureComfyLoraNames } from '~/server/utils/loras'
 import { readLoraStack, resolveLoraStack } from '~/utils/loras'
 import type { LoraStackItem } from '~/utils/loras'
@@ -43,7 +44,7 @@ type VideoChainParams = {
   fps: number
   samplerName: string
   scheduler: string
-  extensions: { prompt: string; duration: number; loraName?: string; loraStack?: LoraStackItem[]; permanenceRefs?: PermanenceRef[] }[]
+  extensions: QueuedExtension[]
   workflow: VideoWorkflowId
   duration: number
   useIdentityRefs: boolean
@@ -323,11 +324,12 @@ export async function continueQueuedExtensions(
         prompt: live.prompt || extensions[i].prompt,
         duration: live.duration || extensions[i].duration
       }
+      const wrappers = resolvePromptWrappers(live, extensions[i], job.library)
       const shotStack = resolveLoraStack(
         readLoraStack(liveQueue).length ? readLoraStack(liveQueue) : (params.loraStack || params.loraName),
         live.loraStack || live.loraName || extensions[i]?.loraStack || extensions[i]?.loraName
       )
-      if (!ext.prompt.trim()) {
+      if (!composePromptParts(wrappers.promptPre, ext.prompt, wrappers.promptPost)) {
         throw new Error(`Shot ${i + 2} needs a prompt`)
       }
 
@@ -385,7 +387,10 @@ export async function continueQueuedExtensions(
         throw new Error('Could not extract the last frame for the next extension: the frame file was empty')
       }
       job.library.extendPart1Path = part1Path
-      job.library.prompt = ext.prompt
+      job.library.prompt = composePromptParts(wrappers.promptPre, ext.prompt, wrappers.promptPost)
+      job.library.promptMid = ext.prompt
+      job.library.promptPre = wrappers.promptPre || undefined
+      job.library.promptPost = wrappers.promptPost || undefined
       if (live.permanenceRefs?.length) {
         const refs = [...(job.library.shotPermanenceRefs || [])]
         refs[i + 1] = live.permanenceRefs