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Dragging timeline keyframe diamonds was unreliable — clip<->tween percentage remapping, an optimistic-hold workaround, and an intermittent no-op/revert when the GSAP session lagged the drag (its own comments document the flakiness). Remove the drag interaction entirely: diamonds still display, click-to-seek, and offer the context menu (add/remove/ease) — keyframe timing is edited via the playhead + panel, which are deterministic. Deletes the keyframe-move plan module + its wiring through TimelineClipDiamonds -> TimelineCanvas -> Timeline -> TimelineEditContext.