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Dopesheet keyframes + Easy Ease — ED.13

The animator's dope sheet was a frame-by-frame timing chart: which drawing on which frame, how a move accelerates and settles. A zoom is the same idea — a value (scale) keyframed across time and eased between the keys. ED.13 brings that chart to the selected zoom: ZoomDopesheet plots its keyframes and offers the easing presets, with Easy Ease front and centre.

flowchart LR
  SEL["selected zoom (ED.12)"] --> KF["zoom_keyframes\nidentity → full → full → identity"]
  KF --> PLOT["dopesheet markers"]
  EASE["ease preset (Easy Ease …)"] --> OP["EditOp::SetZoomEase"]
  OP --> H["edit::History.apply"]
  H --> Z["zoom.ease"]
  Z --> ENG["ED.16 engine eases between keys"]

zoom_keyframes is the pure, Track-shaped view of the engine's ramp: identity at both edges, full amount across the hold (a triangle when the ramps fill the window), the same ramp_frames the engine uses — so the dopesheet shows exactly what plays. The ease row commits EditOp::SetZoomEase through the shared History (undoable), and the engine eases between the keys with the chosen curve. The default and one-click favourite is Easy Ease (InOutCubic) — accelerate off the wide shot, settle into the detail.

Keyframe model now; the curve renders via ED.16

The dopesheet authors the timing — the keyframe positions and the ease — and reads from the same zoom_keyframes/zoom_at math the engine renders, so it can't drift from playback. Plotting an editable Bézier curve handle (drag the ease) and compiling to a literal wisp_animation::Track<Transform> (its Ease set maps 1:1 to ours) are refinements that ride the render-integration pass; the keyframe model + ease selection are the authoring core, and EditEase::eval already drives the eased motion today.