@remotion/studio: Clip overflowing timeline keyframes

[JonnyBurger]

Summary

• clip keyframes and easing curves that extend beyond the composition timeline
• keep out-of-range keyframes in the rendering data while hiding only their overflowing visuals

Verification

• reproduced and verified the fix in the switzerland-map composition
• bun run build
• bun run stylecheck
• bun test src in packages/studio (524 tests)

Closes #9585

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 27, 2026 11:19am
remotion	Ready	Preview, Comment	Jul 27, 2026 11:19am

[pullfrog]

✅ No new issues found.

Reviewed changes — adds overflow: 'hidden' to the TimelineExpandedKeyframeRow container to clip keyframe diamonds and easing curves that extend beyond the composition timeline.

• Clip overflow on keyframe row — added overflow: 'hidden' to the row CSS style in TimelineExpandedKeyframeRow.tsx, which together with the existing position: 'relative' clips child keyframe diamonds and easing lines that render outside the timeline bounds.

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