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Squash-merge of the keyframe-timeline feature onto the current main, which had refactored the timeline in parallel. Preserves main's work (z-order mirror, track gap menu, gap highlights, hook extraction) and layers the keyframe feature on top: expandable property lanes, per-segment ease editor (curve/spring/wiggle), flat-tween lanes, prev/next keyframe nav. Unified the horizontal origin on the threaded contentOrigin parameter (GUTTER collapsed, LABEL_COL_W in keyframe mode); main's TRACKS_LEFT_PAD horizontal pad is superseded by the label-column model.