@remotion/studio: Disable resizing media without explicit duration

[JonnyBurger]

Summary

• hide the right-edge resize handle for audio and video without an explicit durationInFrames
• reject duration drag targets for the same case to keep pointer handling consistent
• add regression coverage for audio with an omitted duration

Testing

• bun test packages/studio/src/test/timeline-selection.test.ts
• bun run build
• bun run stylecheck

Closes #9268

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 24, 2026 8:30am
remotion	Ready	Preview, Comment	Jul 24, 2026 8:30am

[pullfrog]

✅ No new issues found.

Reviewed changes — adds a guard to canResizeTimelineSequenceDuration that disables the right-edge resize handle (and rejects drag targets) for audio/video sequences when durationInFrames lacks an explicit code value override, plus a regression test.

• New canResizeTimelineSequenceDuration guard — checks that codeValue is present for audio/video types; other sequence types always pass when the prop status is 'static'.
• Wired into TimelineSequence.tsx — showRightEdgeDragHandle now uses durationCanResize (which calls the new guard) instead of durationCanUpdate.
• Wired into getTimelineSequenceDurationDragTargets — fetches the per-sequence durationInFrames prop status and rejects drag targets the same way.
• Test coverage — verifies that an audio sequence without an explicit durationInFrames (codeValue: undefined) is structurally draggable but functionally returns null from getTimelineSequenceDurationDragTargets.

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