@remotion/studio: Make pasting keyframes easier

[JonnyBurger]

Summary

• include the copied property identity in keyframe clipboard data
• paste keyframes onto the matching property when a Sequence is selected
• preserve compatibility with clipboard payloads that do not contain property identity

Testing

• bun test packages/studio-shared/src/test/keyframe-clipboard-data.test.ts packages/studio/src/test/timeline-selection.test.ts
• bun run build
• bun run stylecheck

Closes #9392

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 22, 2026 8:12am
remotion	Ready	Preview, Comment	Jul 22, 2026 8:12am

[pullfrog]

✅ No new issues found.

Reviewed changes — PR adds an optional field identity to keyframe clipboard payloads and uses it to paste copied keyframes onto the matching sequence property when a sequence row is selected, while keeping older payloads that omit field valid.

• KeyframeClipboardField type and validation — packages/studio-shared/src/keyframe-clipboard-data.ts now carries a field discriminator and rejects malformed identities.
• Clipboard generation — packages/studio/src/components/Timeline/keyframe-clipboard.ts records field.type/fieldKey when copying keyframes.
• Paste targeting — when exactly one sequence row is selected and the payload identifies a sequence property, the selection is converted to the matching sequence-prop before resolving the paste target.
• Tests — parser coverage for invalid field identities and a new test for pasting onto a selected sequence row; existing copy expectations updated.

Local verification passed for the files in scope: bun test, bunx turbo run make, formatting, and lint on @remotion/studio-shared and @remotion/studio.

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