Build your own easing curve and use it on keys and Lerp (#247)

The built-in eases cover the usual shapes, but a game often wants its
own: a coin that bounces twice, a door that overshoots and settles.
A new asset type holds such a curve, and keys and the Lerp node can
pick it instead of a built-in ease.

- New asset type "curve": points like in Vector art, x is t and y is
  the value. A new curve is the straight line from (0, 0) to (1, 1).
- One pure evaluation in src/core/model/curve.ts serves the timeline
  preview, the running game and the Lerp node.
- The curve always has one value per t. The end points stay at t 0
  and 1, points cannot pass each other, and a handle that reaches past
  its neighbour is shortened along its direction. Loading a hand-edited
  file applies the same rules.
- Curve tab: click on the line to insert a point that keeps the shape,
  click on free space to put one there, drag points and handles,
  double-click or Delete removes, Alt-click toggles round and sharp.
  Every step is one undo step.
- Presets: all 30 built-in eases plus Linear, fitted with adaptive
  subdivision. Each stays within 0.4 % of the built-in ease.
- Preview: a dot runs along the curve once a second, a second dot
  shows only the value. The Preview button stops it.
- Animation keys get "Curve" under Easing with a curve picker. Lerp
  gets "Curve" under Ease, and its result may overshoot b.
- A missing or unpicked curve runs linear. The inspector says so, the
  node shows it as a problem, and deleting a used curve warns with the
  number of keys and Lerp nodes.

Tests:
- ./check.sh: 180 files, 2612 tests, CHECK EXIT 0
- GM_STEPS=1-6,25,53: ALL PASSED, 309 checks
- New e2e module 53 with 13 checks, all with the real mouse. Expected
  values come from its own Bezier evaluation.
- Counter-checks bite: without Bezier evaluation 4 unit tests fail,
  without handle clamping 2. In the browser, a key that cannot find its
  curve, a click that sets no point and a handle drag that moves the
  point all turn checks red.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/editor/debug/curveHooks.ts

@@ -0,0 +1,36 @@
+import { findAssetOf } from '../../core/model/Project';
+import { centreOf, type HookContext } from './hookHelpers';
+
+/** The Curve tab (#247). */
+export function curveHooks({ state, editor }: HookContext) {
+  const { curveEditor } = editor;
+  return {
+    curve: {
+      current: () => curveEditor.currentAssetId,
+      info: () => curveEditor.shownInfo,
+      rect: () => curveEditor.canvasRect(),
+      /** Where a place on the graph (`t` right, `v` up) sits on screen. */
+      at: (t: number, v: number) => curveEditor.canvas.graphToScreen(t, v),
+      /** The points as the model holds them, handles as offsets in `t` and `v`. */
+      points: (assetId: string) => {
+        const asset = findAssetOf(state.project, assetId, 'curve');
+        return asset ? (JSON.parse(JSON.stringify(asset.points)) as unknown) : null;
+      },
+      picked: () => curveEditor.canvas.pickedIndex,
+      pointButton: () => ({
+        ...centreOf(curveEditor.pointButton),
+        text: curveEditor.pointButton.text,
+        enabled: curveEditor.pointButton.enabled,
+      }),
+      presetButton: () => centreOf(curveEditor.presetButton),
+      fitAt: () => centreOf(curveEditor.fitButton),
+      previewButton: () => ({
+        ...centreOf(curveEditor.previewButton),
+        toggled: curveEditor.previewButton.toggled,
+      }),
+      /** The preview as drawn: the share of time, the value, and where its two dots are. */
+      preview: () => curveEditor.canvas.previewState(),
+      setPreviewTime: (seconds: number) => curveEditor.canvas.setPreviewTime(seconds),
+    },
+  };
+}