backup/keyframes-foundation-full
backup/keyframes-foundation-full: fix(studio): per-property-group keyframe tracks + foundation fixes
Replaces the bundled percentage-keyframe model with per-property-group tweens. Each studio operation creates/edits only its own group's tween: drag → position, resize → scale/size, rotate → rotation. Includes off-screen element indicators with drag-to-move, unclipped overlay for off-screen interaction, gesture recording replacement, and all 6 root cause foundation fixes from the keyframe trace investigation.