fix(studio): resolve recent timeline regressions

packages/parsers/src/gsapParser.test.ts

@@ -1656,6 +1656,26 @@ describe("keyframe mutations", () => {
     expect(kfs[1].properties.x).toBe(999);
   });
 
+  it("addKeyframeToScript — preserves exactly one ease when updating an eased keyframe", () => {
+    const script = `
+      const tl = gsap.timeline({ paused: true });
+      tl.to("#hero", {
+        keyframes: { "0%": { scale: 1 }, "60%": { scale: 1.18, ease: "power2.out" }, "100%": { scale: 1 } },
+        duration: 2
+      }, 0);
+    `;
+    const id = getAnimId(script);
+    const updated = addKeyframeToScript(script, id, 60, { scale: 1.18, x: 10, y: 20 });
+    const reparsed = parseGsapScript(updated);
+    const keyframe = reparsed.animations[0].keyframes!.keyframes.find(
+      (kf) => kf.percentage === 60,
+    )!;
+
+    expect((updated.match(/ease:\s*"power2\.out"/g) ?? []).length).toBe(1);
+    expect(keyframe.ease).toBe("power2.out");
+    expect(keyframe.properties).toMatchObject({ scale: 1.18, x: 10, y: 20 });
+  });
+
   // ── backfillDefaults: editing one keyframe must not move the others ──────
   // UX invariant (CapCut/AE): keyframes are independent. Introducing a property
   // to one keyframe (e.g. `y` on an x-only tween) must backfill the other

packages/parsers/src/gsapParser.ts

@@ -1994,8 +1994,11 @@ function buildKeyframeValueNode(
   properties: Record<string, number | string>,
   ease?: string,
 ): AstNode {
-  const entries = Object.entries(properties).map(([k, v]) => `${safeKey(k)}: ${valueToCode(v)}`);
-  if (ease) entries.push(`ease: ${JSON.stringify(ease)}`);
+  const effectiveEase = ease ?? (typeof properties.ease === "string" ? properties.ease : undefined);
+  const entries = Object.entries(properties)
+    .filter(([k]) => k !== "ease")
+    .map(([k, v]) => `${safeKey(k)}: ${valueToCode(v)}`);
+  if (effectiveEase) entries.push(`ease: ${JSON.stringify(effectiveEase)}`);
   return parseExpr(`{ ${entries.join(", ")} }`);
 }
 

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

@@ -0,0 +1,124 @@
+// @vitest-environment happy-dom
+
+import React, { act, useRef } from "react";
+import { createRoot } from "react-dom/client";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { useAppHotkeys } from "../../hooks/useAppHotkeys";
+import { usePlayerStore } from "../../player/store/playerStore";
+import type { LeftSidebarHandle } from "../sidebar/LeftSidebar";
+import type { DomEditSelection } from "./domEditing";
+import { SnapToolbar } from "./SnapToolbar";
+
+(globalThis as unknown as { IS_REACT_ACT_ENVIRONMENT: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+
+afterEach(() => {
+  document.body.innerHTML = "";
+  window.localStorage.clear();
+  usePlayerStore.getState().reset();
+});
+
+function renderToolbar(onSnapChange = vi.fn()) {
+  const host = document.createElement("div");
+  document.body.append(host);
+  const root = createRoot(host);
+  act(() => {
+    root.render(<SnapToolbar onSnapChange={onSnapChange} />);
+  });
+  return { root, onSnapChange };
+}
+
+function AppHotkeyHarness() {
+  const domEditSelectionRef = useRef<DomEditSelection | null>(null);
+  const clearDomSelectionRef = useRef<() => void>(() => undefined);
+  const domEditSaveTimestampRef = useRef(0);
+  const leftSidebarRef = useRef<LeftSidebarHandle | null>(null);
+
+  useAppHotkeys({
+    toggleTimelineVisibility: vi.fn(),
+    handleTimelineElementDelete: vi.fn(),
+    handleTimelineElementSplit: vi.fn(),
+    handleDomEditElementDelete: vi.fn(),
+    domEditSelectionRef,
+    clearDomSelectionRef,
+    editHistory: {
+      undo: vi.fn(async () => ({ ok: false })),
+      redo: vi.fn(async () => ({ ok: false })),
+      state: { undo: [], redo: [] },
+    },
+    readOptionalProjectFile: vi.fn(async () => ""),
+    readProjectFile: vi.fn(async () => ""),
+    writeProjectFile: vi.fn(async () => undefined),
+    domEditSaveTimestampRef,
+    showToast: vi.fn(),
+    syncHistoryPreviewAfterApply: vi.fn(async () => undefined),
+    waitForPendingDomEditSaves: vi.fn(async () => undefined),
+    leftSidebarRef,
+    handleCopy: vi.fn(() => false),
+    handlePaste: vi.fn(async () => undefined),
+    handleCut: vi.fn(async () => false),
+    onResetKeyframes: vi.fn(() => false),
+    onDeleteSelectedKeyframes: vi.fn(),
+  });
+
+  return null;
+}
+
+function renderToolbarWithAppHotkeys(onSnapChange = vi.fn()) {
+  const host = document.createElement("div");
+  document.body.append(host);
+  const root = createRoot(host);
+  act(() => {
+    root.render(
+      <>
+        <AppHotkeyHarness />
+        <SnapToolbar onSnapChange={onSnapChange} />
+      </>,
+    );
+  });
+  return { root, onSnapChange };
+}
+
+describe("SnapToolbar keyboard shortcuts", () => {
+  it("toggles snap on an unclaimed S keypress", () => {
+    const { root, onSnapChange } = renderToolbar();
+
+    act(() => {
+      document.dispatchEvent(
+        new KeyboardEvent("keydown", { key: "s", bubbles: true, cancelable: true }),
+      );
+    });
+
+    expect(onSnapChange).toHaveBeenCalledWith(expect.objectContaining({ snapEnabled: false }));
+    act(() => root.unmount());
+  });
+
+  it("does not toggle snap when another handler already prevented S", () => {
+    const { root, onSnapChange } = renderToolbar();
+    const event = new KeyboardEvent("keydown", {
+      key: "s",
+      bubbles: true,
+      cancelable: true,
+    });
+    event.preventDefault();
+
+    act(() => {
+      document.dispatchEvent(event);
+    });
+
+    expect(onSnapChange).not.toHaveBeenCalled();
+    act(() => root.unmount());
+  });
+
+  it("does not toggle snap when the app split shortcut claims S without a selected clip", () => {
+    const { root, onSnapChange } = renderToolbarWithAppHotkeys();
+
+    act(() => {
+      document.dispatchEvent(
+        new KeyboardEvent("keydown", { key: "s", bubbles: true, cancelable: true }),
+      );
+    });
+
+    expect(onSnapChange).not.toHaveBeenCalled();
+    act(() => root.unmount());
+  });
+});

packages/studio/src/components/editor/SnapToolbar.tsx

@@ -65,6 +65,7 @@ export const SnapToolbar = memo(function SnapToolbar({ onSnapChange }: SnapToolb
   useEffect(() => {
     // fallow-ignore-next-line complexity
     const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.defaultPrevented) return;
       const t = e.target;
       if (t instanceof HTMLInputElement || t instanceof HTMLTextAreaElement) return;
       if (t instanceof HTMLElement && t.isContentEditable) return;

packages/studio/src/hooks/useAppHotkeys.ts

@@ -228,6 +228,9 @@ function dispatchPlainKey(event: KeyboardEvent, key: string, cb: HotkeyCallbacks
   }
 
   if (event.key === "s" && !event.altKey) {
+    // Reserve bare `s` for Split even when the current selection cannot split,
+    // so secondary listeners do not reinterpret the same key as Snap toggle.
+    event.preventDefault();
     const { selectedElementId, elements, currentTime } = usePlayerStore.getState();
     if (selectedElementId) {
       const el = elements.find((e) => (e.key ?? e.id) === selectedElementId);
@@ -237,15 +240,13 @@ function dispatchPlainKey(event: KeyboardEvent, key: string, cb: HotkeyCallbacks
         currentTime > el.start &&
         currentTime < el.start + el.duration
       ) {
-        event.preventDefault();
         void cb.handleTimelineElementSplit(el, currentTime);
         return;
       }
       // Expanded sub-comp children carry a qualified `sourceFile#id` selection
       // that isn't in the raw `elements` list, so the s-key can't resolve them.
       // Nudge toward the razor tool instead of failing silently.
       if (!el && selectedElementId.includes("#")) {
-        event.preventDefault();
         cb.showToast("Use the razor tool (B) to split clips inside a sub-composition", "info");
         return;
       }

packages/studio/src/hooks/useRenderClipContent.test.ts

@@ -1,5 +1,18 @@
-import { describe, expect, it } from "vitest";
+// @vitest-environment happy-dom
+
+import React, { act, isValidElement, type ReactNode } from "react";
+import { createRoot } from "react-dom/client";
+import { afterEach, describe, expect, it } from "vitest";
+import { AudioWaveform } from "../player/components/AudioWaveform";
+import type { TimelineElement } from "../player/store/playerStore";
 import { normalizeCompositionSrc } from "./useRenderClipContent";
+import { useRenderClipContent } from "./useRenderClipContent";
+
+(globalThis as unknown as { IS_REACT_ACT_ENVIRONMENT: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
+
+afterEach(() => {
+  document.body.innerHTML = "";
+});
 
 describe("normalizeCompositionSrc", () => {
   const origin = "http://localhost:5190";
@@ -48,3 +61,43 @@ describe("normalizeCompositionSrc", () => {
     expect(result).toBe("compositions/scenes/hero.html");
   });
 });
+
+describe("useRenderClipContent", () => {
+  function renderClipContent(el: TimelineElement): ReactNode {
+    const host = document.createElement("div");
+    document.body.append(host);
+    const root = createRoot(host);
+    let content: ReactNode = null;
+
+    function Harness() {
+      const render = useRenderClipContent({
+        projectIdRef: { current: "my-project" },
+        compIdToSrc: new Map(),
+        activePreviewUrl: "/api/projects/my-project/preview",
+        effectiveTimelineDuration: 12,
+      });
+      content = render(el, { clip: "#222", label: "#fff" });
+      return null;
+    }
+
+    act(() => {
+      root.render(React.createElement(Harness));
+    });
+    act(() => root.unmount());
+    return content;
+  }
+
+  it("renders audio clips as waveforms even when a composition preview URL is active", () => {
+    const content = renderClipContent({
+      id: "voiceover",
+      tag: "audio",
+      start: 1,
+      duration: 4,
+      track: 1,
+      src: "assets/voiceover.mp3",
+    });
+
+    expect(isValidElement(content)).toBe(true);
+    if (isValidElement(content)) expect(content.type).toBe(AudioWaveform);
+  });
+});

packages/studio/src/hooks/useRenderClipContent.ts

@@ -110,6 +110,13 @@ export function useRenderClipContent({
         });
       }
 
+      // Audio clips — waveform visualization. Resolve these before the generic
+      // activePreviewUrl thumbnail branch; audio rows need waveform data, not a
+      // captured frame from the currently drilled composition preview.
+      if (el.tag === "audio") {
+        return renderAudioClip(el, pid, style.label);
+      }
+
       // When drilled into a composition, render all inner elements via
       // CompositionThumbnail at their start time — most accurate visual.
       if (activePreviewUrl && el.duration > 0) {
@@ -131,11 +138,6 @@ export function useRenderClipContent({
         el.duration < effectiveTimelineDuration * 0.92 &&
         !/(backdrop|background|overlay|scrim|mask)/i.test(el.id);
 
-      // Audio clips — waveform visualization
-      if (el.tag === "audio") {
-        return renderAudioClip(el, pid, style.label);
-      }
-
       if ((el.tag === "video" || el.tag === "img") && el.src) {
         const mediaSrc = el.src.startsWith("http")
           ? el.src

packages/studio/src/player/components/Timeline.test.ts

@@ -3,7 +3,7 @@
 import React, { act } from "react";
 import { createRoot } from "react-dom/client";
 import { afterEach } from "vitest";
-import { describe, it, expect } from "vitest";
+import { describe, it, expect, vi } from "vitest";
 import {
   Timeline,
   formatTimelineTickLabel,
@@ -54,6 +54,56 @@ describe("Timeline provider boundary", () => {
 
     act(() => root.unmount());
   });
+
+  it("opens the keyframe context menu without seeking to that keyframe", () => {
+    const host = document.createElement("div");
+    document.body.append(host);
+    Object.defineProperty(host, "clientWidth", {
+      configurable: true,
+      value: 720,
+    });
+
+    usePlayerStore.setState({
+      duration: 4,
+      timelineReady: true,
+      currentTime: 0.25,
+      selectedElementId: "clip-1",
+      elements: [{ id: "clip-1", tag: "div", start: 0, duration: 4, track: 0 }],
+      keyframeCache: new Map([
+        [
+          "clip-1",
+          {
+            format: "percentage",
+            keyframes: [{ percentage: 50, properties: { x: 100 }, tweenPercentage: 50 }],
+          },
+        ],
+      ]),
+    });
+
+    const onSeek = vi.fn();
+    const root = createRoot(host);
+    act(() => {
+      root.render(React.createElement(Timeline, { onSeek }));
+    });
+
+    const diamond = host.querySelector<HTMLButtonElement>('button[title="50%"]');
+    expect(diamond).not.toBeNull();
+
+    act(() => {
+      diamond!.dispatchEvent(
+        new MouseEvent("contextmenu", {
+          bubbles: true,
+          cancelable: true,
+          button: 2,
+          clientX: 120,
+          clientY: 40,
+        }),
+      );
+    });
+
+    expect(onSeek).not.toHaveBeenCalled();
+    act(() => root.unmount());
+  });
 });
 
 describe("generateTicks", () => {

packages/studio/src/player/components/Timeline.tsx

@@ -487,8 +487,6 @@ export const Timeline = memo(function Timeline({
             if (el) {
               setSelectedElementId(elId);
               onSelectElement?.(el);
-              const absTime = el.start + (pct / 100) * el.duration;
-              onSeek?.(absTime);
             }
             const kfData = keyframeCache.get(elId);
             const kf = kfData?.keyframes.find((k) => Math.abs(k.percentage - pct) < 0.2);