fix(studio): reconnect property-panel audio controls

packages/studio/package.json

@@ -45,7 +45,7 @@
     "types": "./dist/index.d.ts"
   },
   "scripts": {
-    "dev": "vite",
+    "dev": "bun --bun ./node_modules/.bin/vite --host 127.0.0.1",
     "build": "vite build && tsup",
     "typecheck": "tsc --noEmit",
     "test": "vitest run",

packages/studio/src/App.tsx

@@ -38,7 +38,6 @@ import { useToast } from "./hooks/useToast";
 import { useCompositionContentLoader } from "./hooks/useCompositionContentLoader";
 import { useStudioUrlState } from "./hooks/useStudioUrlState";
 import { useEffectiveTimelineDuration } from "./hooks/useEffectiveTimelineDuration";
-import { useAudioSoloBridge } from "./hooks/useAudioSoloBridge";
 import {
   buildStudioContextValue,
   useGlobalFileDrop,
@@ -82,7 +81,6 @@ export function StudioApp() {
   const [previewDocumentVersion, refreshPreviewDocumentVersion] = usePreviewDocumentVersion();
   const [blockPreview, setBlockPreview] = useState<BlockPreviewInfo | null>(null);
   const previewIframeRef = useRef<HTMLIFrameElement | null>(null);
-  useAudioSoloBridge(previewIframeRef);
   const activeCompPathRef = useRef(activeCompPath);
   activeCompPathRef.current = activeCompPath;
   const leftSidebarRef = useRef<LeftSidebarHandle>(null);

packages/studio/src/components/StudioRightPanel.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useRef } from "react";
+import { useCallback } from "react";
 import type { StudioRightPanelProps } from "./StudioRightPanel.types";
 
 export type { StudioRightPanelProps };
@@ -20,15 +20,15 @@ import { usePanelLayoutContext } from "../contexts/PanelLayoutContext";
 import { useFileManagerContext } from "../contexts/FileManagerContext";
 import { useDomEditContext } from "../contexts/DomEditContext";
 import { usePlayerStore } from "../player";
-import { waitForMediaJob } from "./studioMediaJobs";
 import {
   applyColorGradingScopeUpdate,
   EMPTY_COLOR_GRADING_SCOPE_RESULT,
   type ColorGradingScope,
 } from "./studioColorGradingScope";
-import type { BackgroundRemovalProgress } from "./editor/propertyPanelTypes";
 import { timelineKeysForSelections } from "../utils/studioHelpers";
+import { canHideSelections } from "../utils/timelineInspector";
 import { useInspectorSplitResize } from "../hooks/useInspectorSplitResize";
+import { useRemoveBackground } from "../hooks/useRemoveBackground";
 
 // fallow-ignore-next-line complexity
 export function StudioRightPanel({
@@ -164,14 +164,6 @@ export function StudioRightPanel({
     handleInspectorSplitResizeMove,
     handleInspectorSplitResizeEnd,
   } = useInspectorSplitResize();
-  const backgroundRemovalAbortRef = useRef<AbortController | null>(null);
-
-  useEffect(
-    () => () => {
-      backgroundRemovalAbortRef.current?.abort();
-    },
-    [],
-  );
 
   const renderJobs = renderQueue.jobs as RenderJob[];
   const inspectorTabActive = rightPanelTab === "design" || rightPanelTab === "layers";
@@ -238,52 +230,7 @@ export function StudioRightPanel({
     ],
   );
 
-  const handleRemoveBackground = useCallback(
-    // fallow-ignore-next-line complexity
-    async (
-      inputPath: string,
-      options: {
-        createBackgroundPlate?: boolean;
-        quality?: "fast" | "balanced" | "best";
-        onProgress?: (progress: BackgroundRemovalProgress) => void;
-      },
-    ) => {
-      const response = await fetch(
-        `/api/projects/${encodeURIComponent(projectId)}/media/remove-background`,
-        {
-          method: "POST",
-          headers: { "Content-Type": "application/json" },
-          body: JSON.stringify({
-            inputPath,
-            createBackgroundPlate: options.createBackgroundPlate === true,
-            quality: options.quality ?? "balanced",
-          }),
-        },
-      );
-      const data = (await response.json().catch(() => ({}))) as {
-        jobId?: string;
-        error?: string;
-      };
-      if (!response.ok || !data.jobId) {
-        throw new Error(data.error || `Background removal failed (${response.status})`);
-      }
-      showToast("Removing background...", "info");
-      backgroundRemovalAbortRef.current?.abort();
-      const controller = new AbortController();
-      backgroundRemovalAbortRef.current = controller;
-      try {
-        const result = await waitForMediaJob(data.jobId, options.onProgress, controller.signal);
-        await refreshFileTree();
-        showToast(`Created transparent asset: ${result.outputPath.split("/").pop()}`, "info");
-        return result;
-      } finally {
-        if (backgroundRemovalAbortRef.current === controller) {
-          backgroundRemovalAbortRef.current = null;
-        }
-      }
-    },
-    [projectId, refreshFileTree, showToast],
-  );
+  const handleRemoveBackground = useRemoveBackground(projectId, refreshFileTree, showToast);
 
   /**
    * A dial being dragged writes to the preview and stops there.
@@ -300,6 +247,17 @@ export function StudioRightPanel({
     [handleDomAttributeLiveCommit],
   );
   const handleHideAllSelected = () => {
+    // Audio has no visual to hide, and `data-hidden` on an audio element is what
+    // MUTES it — preview silences it and the render drops it from the mix. The
+    // timeline withholds the eye on an audio track for that reason
+    // (`visible={!isAudioTrack}`), and the single-selection panel gates the same
+    // write on `audioSelection`; this multi-selection path was the way back to
+    // it. Checked here as well as in the panel because the button is not the
+    // only caller.
+    if (!canHideSelections(domEditGroupSelections)) {
+      showToast("Audio can't be hidden — use the group's own controls", "info");
+      return;
+    }
     const { elements } = usePlayerStore.getState();
     const keys = timelineKeysForSelections(domEditGroupSelections, elements, activeCompPath);
     if (keys.length > 0) void onToggleElementHidden?.(keys, true);

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

@@ -22,7 +22,7 @@ afterEach(() => {
   vi.resetModules();
 });
 
-function baseElement() {
+function baseElement(): NonNullable<PropertyPanelProps["element"]> {
   return {
     element: document.createElement("div"),
     id: "mono-label",
@@ -81,7 +81,7 @@ function nonTextElement() {
 // flat multi-field layer list (FlatTextLayerList + FlatTextFieldEditor) —
 // must not double-render the "Text" heading (FlatGroup's own heading; this
 // component never renders one of its own).
-function multiFieldTextElement() {
+function multiFieldTextElement(): NonNullable<PropertyPanelProps["element"]> {
   const base = baseElement();
   return {
     ...base,
@@ -177,6 +177,43 @@ function sixGroupElement() {
   };
 }
 
+/** An `<audio>` clip: placed on the timeline, but nothing a tween could move. */
+function audioClipElement() {
+  const element = document.createElement("audio");
+  return {
+    ...baseElement(),
+    element,
+    id: "vo-1",
+    selector: "#vo-1",
+    label: "Vo 1",
+    tagName: "audio",
+    textFields: [],
+    dataAttributes: { start: "1", duration: "3" },
+  };
+}
+
+/**
+ * A mixer bus: no clip range at all, and no box either.
+ *
+ * Carries a `data-start` on purpose. A real bus has none — its automation clock
+ * is composition time — but the timing gate has to refuse the TAG rather than
+ * merely fall out of a missing attribute, or something writing one would put
+ * Start/Duration back on a thing that has no range.
+ */
+function audioBusElement() {
+  const element = document.createElement("hf-audio-group");
+  return {
+    ...baseElement(),
+    element,
+    id: "voiceover",
+    selector: "#voiceover",
+    label: "Voiceover",
+    tagName: "hf-audio-group",
+    textFields: [],
+    dataAttributes: { start: "0", duration: "8" },
+  };
+}
+
 const INFERRED_TIMING_ANIMATION = {
   id: "a1",
   targetSelector: "#inferred-anim",
@@ -196,7 +233,7 @@ const INFERRED_TIMING_ANIMATION = {
 
 async function renderPanel(
   flatEnabled: boolean,
-  elementOverride: ReturnType<typeof baseElement> = baseElement(),
+  elementOverride: NonNullable<PropertyPanelProps["element"]> = baseElement(),
   propsOverride: Partial<PropertyPanelProps> = {},
   currentTime?: number,
 ) {
@@ -952,3 +989,64 @@ describe("PropertyPanel — flat group entrance animation scoping (fix round)",
     RENDER_TIMEOUT_MS,
   );
 });
+
+describe("PropertyPanel — Motion is for things that move", () => {
+  it.each([
+    ["a custom music tag", () => document.createElement("music")],
+    [
+      "an element with an audio source",
+      () => {
+        const element = document.createElement("div");
+        element.setAttribute("src", "voiceover.mp3");
+        return element;
+      },
+    ],
+  ])("recognizes %s through the shared audio predicate", async (_label, makeElement) => {
+    const fixture = {
+      ...audioClipElement(),
+      element: makeElement(),
+      tagName: "div",
+    };
+    const { host, root } = await renderPanel(true, fixture);
+    const titles = Array.from(
+      host.querySelectorAll<HTMLElement>("[data-flat-group-collapsed], [data-flat-group-open]"),
+    ).map((node) => node.textContent ?? "");
+    expect(titles.some((title) => title.includes("Motion"))).toBe(false);
+    expect(titles.some((title) => title.includes("Timing"))).toBe(true);
+    act(() => root.unmount());
+  });
+
+  it(
+    "calls the section Timing on an audio clip, and offers no tween editor",
+    async () => {
+      const { host, root } = await renderPanel(true, audioClipElement());
+      const titles = Array.from(
+        host.querySelectorAll<HTMLElement>("[data-flat-group-collapsed], [data-flat-group-open]"),
+      ).map((el) => el.textContent ?? "");
+      // The clip's placement survives — it is still a clip on a track.
+      expect(titles.some((t) => t.includes("Timing"))).toBe(true);
+      // "Motion" named the tween editor, which an <audio> element has no
+      // transform, opacity or box for. Showing it was the panel gating on
+      // handler presence rather than on the element.
+      expect(titles.some((t) => t.includes("Motion"))).toBe(false);
+      act(() => root.unmount());
+    },
+    RENDER_TIMEOUT_MS,
+  );
+
+  it(
+    "offers a bus neither — it has no clip range to edit",
+    async () => {
+      const { host, root } = await renderPanel(true, audioBusElement());
+      const titles = Array.from(
+        host.querySelectorAll<HTMLElement>("[data-flat-group-collapsed], [data-flat-group-open]"),
+      ).map((el) => el.textContent ?? "");
+      expect(titles.some((t) => t.includes("Motion"))).toBe(false);
+      expect(titles.some((t) => t.includes("Timing"))).toBe(false);
+      // It is still a mixer bus: the reason to select one at all.
+      expect(titles.some((t) => t.includes("Audio FX"))).toBe(true);
+      act(() => root.unmount());
+    },
+    RENDER_TIMEOUT_MS,
+  );
+});

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

@@ -36,6 +36,7 @@ import { type PropertyPanelProps } from "./propertyPanelHelpers";
 import { GestureRecordPanelButton } from "./GestureRecordControl";
 import { PropertyPanelEmptyState } from "./PropertyPanelEmptyState";
 import { DesignPanelInputProvider } from "../../contexts/DesignPanelInputContext";
+import { isAudioDomElement } from "../../utils/timelineInspector";
 
 // Re-export helpers that external consumers import from this module
 export {
@@ -119,6 +120,19 @@ export const PropertyPanel = memo(function PropertyPanel(props: PropertyPanelPro
   const selectedElementId = usePlayerStore((s) => s.selectedElementId);
   const selectedElementHidden = isSelectedElementHidden(timelineElements, selectedElementId);
   const visibilityToggleLabel = selectedElementHidden ? "Show element" : "Hide element";
+  /**
+   * An audio element gets no hide control here.
+   *
+   * On an audio track "hidden" and "muted" are not similar operations, they are
+   * the SAME operation with two names (groups doc §2.1) — which is why the
+   * timeline's eye became the mute rather than growing a sibling. A second copy
+   * in the panel, still called "Hide element", is precisely the thing that step
+   * removed: "Two controls that silence a track, sitting next to each other,
+   * differing only in a distinction the author cannot see." An
+   * `<hf-audio-group>` has no visual to hide at all, and its mute lives on its
+   * own row.
+   */
+  const audioSelection = isAudioDomElement(element?.element);
   // Live during playback, the store's when paused — see the hook. Shared with the
   // audio FX panel, which follows the playhead for the same reason: a value the
   // timeline drives has to be shown moving, not frozen at what the attribute says.
@@ -309,7 +323,7 @@ export const PropertyPanel = memo(function PropertyPanel(props: PropertyPanelPro
               selectedElementId={selectedElementId}
               selectedElementHidden={selectedElementHidden}
               visibilityLabel={visibilityToggleLabel}
-              onToggleHidden={onToggleElementHidden}
+              onToggleHidden={audioSelection ? undefined : onToggleElementHidden}
             />
           </div>
         </div>

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

@@ -71,4 +71,78 @@ describe("PropertyPanelEmptyState — flat multi-select", () => {
     expect(onClearSelection).toHaveBeenCalledTimes(1);
     act(() => root.unmount());
   });
+
+  // A layout group is a positioned wrapper around a bounding box; an <audio>
+  // clip has none (offsetWidth/Height are 0), so grouping audio produced a 0x0
+  // div with inline left/top on elements that are never laid out. Withheld
+  // rather than offered-then-refused.
+  const audioElements = (tags: string[]) =>
+    tags.map((tag, i) => ({
+      id: `el-${i}`,
+      selector: `#el-${i}`,
+      label: `El ${i}`,
+      tagName: tag,
+      element: document.createElement(tag),
+    })) as unknown as DomEditSelection[];
+
+  it("withholds both actions when the selection includes audio", () => {
+    const { host, root } = renderInto(
+      <PropertyPanelEmptyState
+        flat
+        multiSelectCount={2}
+        multiSelectedElements={audioElements(["audio", "audio"])}
+        onGroupSelection={vi.fn()}
+        onHideAllSelected={vi.fn()}
+      />,
+    );
+    expect(host.querySelector('[data-flat-multiselect-group="true"]')).toBeNull();
+    // Hiding is visibility, and `data-hidden` on audio is what MUTES it — the
+    // timeline withholds the eye on an audio track for that reason, and this
+    // panel was the way back to the same write.
+    expect(host.querySelector('[data-flat-multiselect-hide-all="true"]')).toBeNull();
+    // The list still names what is selected; only the actions go.
+    expect(host.textContent).toContain("2 elements selected");
+    act(() => root.unmount());
+  });
+
+  it("withholds it for a mixed selection too, since the wrapper would still take audio in", () => {
+    const { host, root } = renderInto(
+      <PropertyPanelEmptyState
+        flat
+        multiSelectCount={2}
+        multiSelectedElements={audioElements(["div", "audio"])}
+        onGroupSelection={vi.fn()}
+      />,
+    );
+    expect(host.querySelector('[data-flat-multiselect-group="true"]')).toBeNull();
+    expect(host.querySelector('[data-flat-multiselect-hide-all="true"]')).toBeNull();
+    act(() => root.unmount());
+  });
+
+  it("counts an <hf-audio-group> bus as audio too", () => {
+    const { host, root } = renderInto(
+      <PropertyPanelEmptyState
+        flat
+        multiSelectCount={2}
+        multiSelectedElements={audioElements(["hf-audio-group", "div"])}
+        onGroupSelection={vi.fn()}
+      />,
+    );
+    expect(host.querySelector('[data-flat-multiselect-group="true"]')).toBeNull();
+    act(() => root.unmount());
+  });
+
+  it("still offers both for a selection of layout elements", () => {
+    const { host, root } = renderInto(
+      <PropertyPanelEmptyState
+        flat
+        multiSelectCount={2}
+        multiSelectedElements={audioElements(["div", "span"])}
+        onGroupSelection={vi.fn()}
+      />,
+    );
+    expect(host.querySelector('[data-flat-multiselect-group="true"]')).not.toBeNull();
+    expect(host.querySelector('[data-flat-multiselect-hide-all="true"]')).not.toBeNull();
+    act(() => root.unmount());
+  });
 });