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Miguel Ángel
ab08260201
Extract shared utilities to reduce duplication across timeline components: - PlayheadIndicator: shared playhead rendering (was duplicated in TimelineCanvas and TimelineEditorNotice) - useContextMenuDismiss: outside-click/Escape dismiss pattern (was duplicated in ClipContextMenu and KeyframeDiamondContextMenu) - TimelineCallbacks: shared callback interfaces for drop and edit operations (was duplicated in NLELayout and Timeline props) - useTimelineZoom: consolidated zoom store selectors - timelineElementSplit: shared canSplitElement, buildPatchTarget, and readFileContent utilities - gsapParser.test-helpers: shared test utilities for parser specs