feat(studio): add keyframe ease editor

packages/studio/src/components/editor/AnimationCard.test.tsx

@@ -5,11 +5,16 @@ import { createRoot } from "react-dom/client";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { AnimationCard } from "./AnimationCard";
 import type { GsapAnimation } from "@hyperframes/core/gsap-parser";
+import { EASE_PRESETS } from "./easePresetLibrary";
+
+const trackStudioSegmentEaseEdit = vi.hoisted(() => vi.fn());
+vi.mock("../../telemetry/events", () => ({ trackStudioSegmentEaseEdit }));
 
 (globalThis as unknown as { IS_REACT_ACT_ENVIRONMENT: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
 
 afterEach(() => {
   document.body.innerHTML = "";
+  trackStudioSegmentEaseEdit.mockClear();
 });
 
 function baseAnimation(overrides: Partial<GsapAnimation> = {}): GsapAnimation {
@@ -26,6 +31,101 @@ function baseAnimation(overrides: Partial<GsapAnimation> = {}): GsapAnimation {
 
 const noop = () => {};
 
+function selectPreset(host: HTMLElement, presetId: string): string {
+  const presetConfig = EASE_PRESETS.find((candidate) => candidate.id === presetId);
+  if (!presetConfig) throw new Error(`Missing ease preset: ${presetId}`);
+
+  const dropdown = host.querySelector<HTMLButtonElement>("[data-ease-type-dropdown]");
+  expect(dropdown).not.toBeNull();
+  act(() => dropdown?.click());
+
+  const preset = host.querySelector<HTMLButtonElement>(`[data-ease-preset-id="${presetId}"]`);
+  expect(preset).not.toBeNull();
+  act(() => preset?.click());
+  return presetConfig.ease;
+}
+
+function renderExpandedCard({
+  animation,
+  flat,
+  onUpdateMeta = vi.fn(),
+  onUpdateKeyframeEase = vi.fn(),
+}: {
+  animation: GsapAnimation;
+  flat?: boolean;
+  onUpdateMeta?: ReturnType<typeof vi.fn>;
+  onUpdateKeyframeEase?: ReturnType<typeof vi.fn>;
+}) {
+  const host = document.createElement("div");
+  document.body.append(host);
+  const root = createRoot(host);
+  act(() => {
+    root.render(
+      <AnimationCard
+        animation={animation}
+        defaultExpanded
+        flat={flat}
+        onUpdateProperty={noop}
+        onUpdateMeta={onUpdateMeta}
+        onDeleteAnimation={noop}
+        onAddProperty={noop}
+        onRemoveProperty={noop}
+        onUpdateKeyframeEase={onUpdateKeyframeEase}
+      />,
+    );
+  });
+  return { host, root };
+}
+
+describe("AnimationCard ease editing", () => {
+  it("commits one preset change to the selected keyframe segment", () => {
+    const onUpdateKeyframeEase = vi.fn();
+    const animation = baseAnimation({
+      keyframes: {
+        format: "percentage",
+        keyframes: [
+          { percentage: 0, properties: { opacity: 0 } },
+          { percentage: 50, properties: { opacity: 0.5 } },
+          { percentage: 100, properties: { opacity: 1 } },
+        ],
+      },
+    });
+    const view = renderExpandedCard({ animation, onUpdateKeyframeEase });
+
+    const segment = Array.from(view.host.querySelectorAll("button")).find((button) =>
+      button.textContent?.includes("0% → 50%"),
+    );
+    expect(segment).toBeDefined();
+    act(() => segment?.click());
+    const ease = selectPreset(view.host, "quad-out");
+
+    expect(onUpdateKeyframeEase).toHaveBeenCalledExactlyOnceWith(animation.id, 50, ease);
+    expect(trackStudioSegmentEaseEdit).toHaveBeenCalledExactlyOnceWith({
+      ease,
+    });
+    act(() => view.root.unmount());
+  });
+
+  it("commits one preset change through flat tween metadata", () => {
+    const onUpdateMeta = vi.fn();
+    const onUpdateKeyframeEase = vi.fn();
+    const animation = baseAnimation({ id: "flat-tween" });
+    const view = renderExpandedCard({
+      animation,
+      flat: true,
+      onUpdateMeta,
+      onUpdateKeyframeEase,
+    });
+
+    const ease = selectPreset(view.host, "quad-out");
+
+    expect(onUpdateMeta).toHaveBeenCalledExactlyOnceWith(animation.id, { ease });
+    expect(onUpdateKeyframeEase).not.toHaveBeenCalled();
+    expect(trackStudioSegmentEaseEdit).not.toHaveBeenCalled();
+    act(() => view.root.unmount());
+  });
+});
+
 describe("AnimationCard flat branch", () => {
   it("renders a mint border-left and panel-token colors when flat", () => {
     const host = document.createElement("div");