Split prompts into pre/prompt/post and tidy the AIGen video form.

Keep wrappers off the library mid-prompt so Use as input and Extend restore the same split, send stills to xAIGen as hidden inputs, and stop the two-column library from growing with the list.

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

server/utils/videoChain.ts

@@ -22,6 +22,7 @@ import {
   updateShotQueue
 } from '~/server/utils/shotQueue'
 import { composeShotPrompt, allowIdentityRefs, type PermanenceRef } from '~/utils/globalLocks'
+import { composePromptParts } from '~/utils/promptParts'
 import { persistLoraFields, ensureComfyLoraNames } from '~/server/utils/loras'
 import { readLoraStack, resolveLoraStack } from '~/utils/loras'
 import type { LoraStackItem } from '~/utils/loras'
@@ -186,7 +187,7 @@ export async function queueMiniMax(
   const shotIndex = job.library?.chainIndex || 0
   const composedPrompt = composeShotPrompt({
     globalLocks: job.library?.globalLocks || params.globalLocks,
-    prompt: params.prompt,
+    prompt: composePromptParts(job.library?.promptPre || '', params.prompt, job.library?.promptPost || ''),
     shotIndex,
     familyRefs: job.library?.permanenceRefs || params.permanenceRefs,
     shotRefs: job.library?.shotPermanenceRefs?.[shotIndex] || params.shotPermanenceRefs?.[shotIndex]