Pass reasons through motion cancellation

[Tomeshwari-02]

Summary

• add an AnimationCancel type that accepts an optional reason
• pass cancellation reasons through sequence, parallel, and repeat
• export the cancellation type from the motion package

Tests

• bun test packages/motion/src/sequence.test.ts packages/motion/src/repeat.test.ts

Closes #2954

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📥 Commits

Reviewing files that changed from the base of the PR and between 61eaa4e and 9ce3252.

📒 Files selected for processing (4)

• packages/motion/src/index.ts
• packages/motion/src/repeat.test.ts
• packages/motion/src/sequence.test.ts
• packages/motion/src/sequence.ts

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[Karanjot786]

Blocking — the reason is dead metadata. This threads an optional reason through sequence/parallel/repeat cancel functions, but nothing consumes it: leaf runners (transitions.ts fadeIn/out/slide/typewriter/pulse) and stagger.ts drop it, and no widget or onCancel(reason) hook reads it. Same pattern as the previously-blocked #2911 dirty-reason. Either wire a real consumer (e.g. an onCancel(reason) callback that something uses) or drop the plumbing. Checklist: [ ] reason actually consumed, or removed.