[Verify] Motion Graphics mode end to end

[samolubukun]

Goal

Confirm the Motion Graphics mode (videoType: "MotionGraphics") works end to end, or fix what breaks.

Context

Only 4 modes are confirmed working. Motion Graphics is untested and a top priority - see the Priority Areas section in CONTRIBUTING.md.

Test payload

POST to /api/videos:

{
  "videoType": "MotionGraphics",
  "prompt": "Show a comparison of the top 3 programming languages in 2026",
  "topic": "Programming",
  "aspectRatio": "9:16",
  "voice": "aura-2-aries-en"
}

What "works" means

• Job reaches completed via GET /api/videos/{jobId}.
• Video renders with animated slides, charts, and typography; narration is audible.
• Any failure fails with a clear, actionable error.

Notes

• Pipeline in src/lib/motion-graphics-timeline.ts; composition in src/remotion/.
• Uses OpenAI (GPT-4o-mini) for the storyboard JSON + Deepgram TTS.

Definition of done

Comment with the jobId, output URL, and pass/fail. If failed, fix it and link the PR.

Add to README

Once this mode is verified, add its output to the README so it shows among the sample outputs - link the final video (and add a screenshot if you have one) to the 'Current Outputs' section in README.md, following the existing grid cards.