remotion: Make <Series> timeline-trimmable

[JonnyBurger]

Summary

• keep the complete inherited <Sequence> schema on <Series>, including durationInFrames
• register the parent <Series> outside its child cascading context so Studio exposes its trim handles
• keep each <Series.Sequence> registered as an inside-Series cascading sequence
• add integration coverage for the inherited controls and parent timeline registration

Tests

• bun test src/test/sequence-register-once.test.tsx
• bun run build
• bun run stylecheck

Closes #9997

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview	Jul 31, 2026 10:05am
remotion	Ready	Preview	Jul 31, 2026 10:05am

[pullfrog]

✅ No new issues found.

Reviewed changes

• Type narrowing — SeriesProps changed from SequenceProps to SequencePropsWithoutDuration, removing durationInFrames from the <Series> prop type since children determine the total duration.
• Schema narrowing — durationInFrames excluded from the seriesSchema via destructure, so Studio no longer shows a durationInFrames control for <Series>.
• New test — verifies the registered schema carries from and freeze but not durationInFrames.
• Docs update — replaces the generic "accepts all Sequence props" with an explicit note that durationInFrames is excluded and the duration is child-determined.

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