@remotion/studio: Internal rename for timeline items

[JonnyBurger]

Fixes #7858.

Summary

• Rename timeline row components to canonical *Item names.
• Refactor timeline selection rows into explicit sequence, sequence-prop, sequence-all-effects, sequence-effect, and sequence-effect-prop variants.
• Update duplicate/delete selection logic and timeline selection tests for the discriminated union.

Testing

• bun test src/test/timeline-selection.test.ts
• bun run formatting from packages/studio
• bunx turbo run make --filter='@remotion/studio'
• bun run build
• bunx turbo run lint formatting --filter='@remotion/studio' (passes with pre-existing Studio lint warnings)
• bun run stylecheck (blocked by known @remotion/lambda-go Go 1.22.2 environment limitation; package-specific Studio stylecheck passes)

  

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	May 31, 2026 2:45pm
remotion	Ready	Preview, Comment	May 31, 2026 2:45pm

[pullfrog]

✅ No new issues found.

Reviewed changes — rename timeline row components to canonical *Item names and refactor the TimelineSelection discriminated union from a single row variant into explicit sequence*, sequence-prop, sequence-all-effects, sequence-effect, and sequence-effect-prop variants.

• Rename timeline components — TimelineEffectGroupRow → TimelineEffectItem, TimelineEffectFieldRow → TimelineEffectPropItem, TimelineListItem → TimelineSequenceItem, TimelineSequenceFieldRow → TimelineSequencePropItem; all imports and call sites updated consistently.
• Introduce explicit selection variants — replaces opaque type: 'row' with a discriminated union where each variant corresponds to a known auxiliaryKeys pattern from buildTimelineTree, making the selection model self-documenting.
• Add getTimelineSelectionFromNodePathInfo — centralizes parsing of SequenceNodePathInfo into the correct TimelineSelection variant; correctly handles all valid auxiliaryKeys shapes ([], ['controls', key], ['effects'], ['effects', index], ['effects', index, key]) and returns null for unrecognized patterns.
• Update selection key generation — getTimelineSelectionKey now encodes the explicit variant type into the key string, which is safe because selection state is purely in-memory (SELECTION_ENABLED is still false).
• Update delete/duplicate guards — delete-selected-timeline-item.ts and duplicate-selected-timeline-item.ts now match on the explicit union instead of inspecting auxiliaryKeys inline; behavior is preserved (sequence and sequence-effect are deletable, props/groups are not).
• Expand test coverage — timeline-selection.test.ts covers all five getTimelineSelectionFromNodePathInfo variants plus the malformed-effect-index fallback to null.

  ^{｜ View workflow run ｜ Using Kimi K2 ｜ 𝕏}

[pullfrog]

✅ No new issues found.

Reviewed changes — rename timeline row components to canonical *Item names and refactor the TimelineSelection discriminated union from a single row variant into explicit sequence*, sequence-prop, sequence-all-effects, sequence-effect, and sequence-effect-prop variants.

• Rename timeline components — TimelineEffectGroupRow → TimelineEffectItem, TimelineEffectFieldRow → TimelineEffectPropItem, TimelineListItem → TimelineSequenceItem, TimelineSequenceFieldRow → TimelineSequencePropItem; all imports and call sites updated consistently.
• Introduce explicit selection variants — replaces opaque type: 'row' with a discriminated union where each variant corresponds to a known auxiliaryKeys pattern from buildTimelineTree, making the selection model self-documenting.
• Add getTimelineSelectionFromNodePathInfo — centralizes parsing of SequenceNodePathInfo into the correct TimelineSelection variant; correctly handles all valid auxiliaryKeys shapes ([], ['controls', key], ['effects'], ['effects', index], ['effects', index, key]) and returns null for unrecognized patterns.
• Update selection key generation — getTimelineSelectionKey now encodes the explicit variant type into the key string, which is safe because selection state is purely in-memory (SELECTION_ENABLED is still false).
• Update delete/duplicate guards — delete-selected-timeline-item.ts and duplicate-selected-timeline-item.ts now match on the explicit union instead of inspecting auxiliaryKeys inline; behavior is preserved (sequence and sequence-effect are deletable, props/groups are not).
• Expand test coverage — timeline-selection.test.ts covers all five getTimelineSelectionFromNodePathInfo variants plus the malformed-effect-index fallback to null.

  ^{｜ View workflow run ｜ Using Kimi K2 ｜ 𝕏}