Create standalone browser port of LTX Athena with authenticated native API transport

frontend/lib/build-generate-video-body.ts

@@ -0,0 +1,33 @@
+import type { GenSpaceMode } from './genspace-multi-keyframe'
+import { toKeyframeInputs, type KeyframeItem } from './multi-keyframe.ts'
+
+interface GenerateVideoImageInputs {
+  imagePath?: string
+  lastImagePath?: string
+  keyframes?: Array<{
+    imagePath: string
+    frameIndex: number
+    strength: number
+  }>
+}
+
+export function buildGenerateVideoImageInputs({
+  mode,
+  imagePath,
+  lastImagePath,
+  keyframes,
+}: {
+  mode: GenSpaceMode
+  imagePath: string | null | undefined
+  lastImagePath: string | null | undefined
+  keyframes: KeyframeItem[]
+}): GenerateVideoImageInputs {
+  if (mode === 'multi-keyframe' && keyframes.length > 0) {
+    return { keyframes: toKeyframeInputs(keyframes) }
+  }
+
+  return {
+    ...(imagePath ? { imagePath } : {}),
+    ...(lastImagePath ? { lastImagePath } : {}),
+  }
+}