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Every bbox edit is a keyframe (◆) with live preview — including rotation: select a box and drag its ⟳ knob (Shift snaps 15°, double-click the knob resets, angles interpolate between keyframes; training [x,y,w,h] rows stay axis-aligned). Onion blends neighbor frames while paused. ✂ split (or S) cuts the selected ID at the playhead; “＋ tag” gives each animal a colored research label.