Add MiniMax and PinkCherry LTX as pickable video engines, with still or text start.

Shot 1 can run text-to-video; later shots still extend from the last frame. Recommend output is also normalized into shot-script cards.

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

utils/videoModels.ts

@@ -0,0 +1,56 @@
+export type VideoEngineId = 'minimax' | 'ltx'
+export type VideoStartId = 'still' | 'text'
+export type MiniMaxGraphId = 'v1' | 'v2'
+export type VideoWorkflowId = 'v1' | 'v2' | 't2v' | 'ltx' | 'ltx-t2v'
+
+export function parseVideoWorkflow(raw: unknown): VideoWorkflowId {
+  const value = String(raw || '').trim()
+  if (value === 'v2') return 'v2'
+  if (value === 't2v') return 't2v'
+  if (value === 'ltx' || value === 'ltx-i2v') return 'ltx'
+  if (value === 'ltx-t2v') return 'ltx-t2v'
+  return 'v1'
+}
+
+export function videoEngineOf(id: VideoWorkflowId): VideoEngineId {
+  return id.startsWith('ltx') ? 'ltx' : 'minimax'
+}
+
+export function videoStartOf(id: VideoWorkflowId): VideoStartId {
+  return id === 't2v' || id === 'ltx-t2v' ? 'text' : 'still'
+}
+
+export function isLtxWorkflow(id: VideoWorkflowId) {
+  return videoEngineOf(id) === 'ltx'
+}
+
+export function isTextToVideo(id: VideoWorkflowId) {
+  return videoStartOf(id) === 'text'
+}
+
+export function minimaxGraphOf(id: VideoWorkflowId): MiniMaxGraphId {
+  return id === 'v2' ? 'v2' : 'v1'
+}
+
+export function workflowForExtension(id: VideoWorkflowId): VideoWorkflowId {
+  if (id === 't2v') return 'v1'
+  if (id === 'ltx-t2v') return 'ltx'
+  return id
+}
+
+export function composeVideoWorkflow(engine: VideoEngineId, start: VideoStartId, graph: MiniMaxGraphId = 'v1'): VideoWorkflowId {
+  if (engine === 'ltx') return start === 'text' ? 'ltx-t2v' : 'ltx'
+  if (start === 'text') return 't2v'
+  return graph === 'v2' ? 'v2' : 'v1'
+}
+
+export function defaultVideoSteps(turbo: boolean, workflow: string = 'v1') {
+  const id = parseVideoWorkflow(workflow)
+  if (!turbo) return isLtxWorkflow(id) ? 12 : 20
+  if (isLtxWorkflow(id)) return 8
+  return id === 'v2' ? 6 : 8
+}
+
+export const LTX_UNET = 'PinkCherry_FineTune_int8_v1_8_LTX23.safetensors'
+export const LTX_DISTILLED_LORA = 'ltx-2.3-22b-distilled-lora-384-1.1.safetensors'
+export const LTX_NEGATIVE = 'blurry, low quality, jitter, deformed, static frame, freeze, watermark, bad anatomy, text, subtitles'