feat(studio): route element delete through SDK removeElement (§3.1)

packages/studio/src/hooks/useDomEditCommits.ts

@@ -85,6 +85,8 @@ export interface UseDomEditCommitsParams {
     originalContent: string,
     targetPath: string,
   ) => Promise<boolean>;
+  /** Stage 7 §3.1: called before the server-side delete path; returns true if SDK handled it. */
+  onTrySdkDelete?: (hfId: string, originalContent: string, targetPath: string) => Promise<boolean>;
 }
 
 export function useDomEditCommits({
@@ -107,6 +109,7 @@ export function useDomEditCommits({
   buildDomSelectionFromTarget,
   onDomEditPersisted,
   onTrySdkPersist,
+  onTrySdkDelete,
 }: UseDomEditCommitsParams) {
   const resolveImportedFontAsset = useCallback(
     (fontFamilyValue: string): ImportedFontAsset | null => {
@@ -306,6 +309,7 @@ export function useDomEditCommits({
     projectIdRef,
     reloadPreview,
     clearDomSelection,
+    onTrySdkDelete,
     commitPositionPatchToHtml,
   });
 

packages/studio/src/hooks/useDomEditSession.ts

@@ -5,7 +5,7 @@ import type { RightPanelTab } from "../utils/studioHelpers";
 import type { PatchTarget } from "../utils/sourcePatcher";
 import type { SidebarTab } from "../components/sidebar/LeftSidebar";
 import type { Composition } from "@hyperframes/sdk";
-import { sdkCutoverPersist } from "../utils/sdkCutover";
+import { sdkCutoverPersist, sdkDeletePersist } from "../utils/sdkCutover";
 import { useAskAgentModal } from "./useAskAgentModal";
 import { useDomSelection } from "./useDomSelection";
 import { usePreviewInteraction } from "./usePreviewInteraction";
@@ -240,6 +240,15 @@ export function useDomEditSession({
             domEditSaveTimestampRef,
           })
       : undefined,
+    onTrySdkDelete: sdkSession
+      ? (hfId, originalContent, targetPath) =>
+          sdkDeletePersist(hfId, originalContent, targetPath, sdkSession, {
+            editHistory,
+            writeProjectFile,
+            reloadPreview,
+            domEditSaveTimestampRef,
+          })
+      : undefined,
   });
 
   // ── Wiring: selection sync, GSAP cache, preview sync, selection handlers ──

packages/studio/src/hooks/useElementLifecycleOps.ts

@@ -26,6 +26,8 @@ interface UseElementLifecycleOpsParams {
   projectIdRef: React.MutableRefObject<string | null>;
   reloadPreview: () => void;
   clearDomSelection: () => void;
+  /** Route delete through SDK when session resolves the hf-id; returns true if handled. */
+  onTrySdkDelete?: (hfId: string, originalContent: string, targetPath: string) => Promise<boolean>;
   commitPositionPatchToHtml: (
     selection: DomEditSelection,
     patches: PatchOperation[],
@@ -42,6 +44,7 @@ export function useElementLifecycleOps({
   projectIdRef,
   reloadPreview,
   clearDomSelection,
+  onTrySdkDelete,
   commitPositionPatchToHtml,
 }: UseElementLifecycleOpsParams) {
   // fallow-ignore-next-line complexity
@@ -71,6 +74,16 @@ export function useElementLifecycleOps({
           throw new Error("Selected element has no patchable target");
         }
 
+        if (onTrySdkDelete && selection.hfId) {
+          const handled = await onTrySdkDelete(selection.hfId, originalContent, targetPath);
+          if (handled) {
+            clearDomSelection();
+            usePlayerStore.getState().setSelectedElementId(null);
+            showToast(`Deleted ${label}. Use Undo to restore it.`, "info");
+            return;
+          }
+        }
+
         domEditSaveTimestampRef.current = Date.now();
         const removeResponse = await fetch(
           `/api/projects/${pid}/file-mutations/remove-element/${encodeURIComponent(targetPath)}`,
@@ -114,13 +127,17 @@ export function useElementLifecycleOps({
       clearDomSelection,
       domEditSaveTimestampRef,
       editHistory.recordEdit,
+      onTrySdkDelete,
       projectIdRef,
       reloadPreview,
       showToast,
       writeProjectFile,
     ],
   );
 
+  // ponytail: z-index reorder writes inline-style patches via commitPositionPatchToHtml →
+  // persistDomEditOperations → onTrySdkPersist, so it is already SDK-cut-over as setStyle.
+  // No SDK reorder/reparent op exists; DOM sibling order stays server-authoritative if ever needed.
   const handleDomZIndexReorderCommit = useCallback(
     (
       entries: Array<{

packages/studio/src/utils/sdkCutover.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it, vi } from "vitest";
-import { shouldUseSdkCutover, sdkCutoverPersist } from "./sdkCutover";
+import { shouldUseSdkCutover, sdkCutoverPersist, sdkDeletePersist } from "./sdkCutover";
 import { openComposition } from "@hyperframes/sdk";
 import { createMemoryAdapter } from "@hyperframes/sdk/adapters/memory";
 import type { PatchOperation } from "./sourcePatcher";
@@ -291,6 +291,74 @@ describe("sdkCutoverPersist", () => {
   });
 });
 
+describe("sdkDeletePersist", () => {
+  const makeRef = <T>(val: T): MutableRefObject<T> => ({ current: val });
+  const makeDeps = () => ({
+    editHistory: { recordEdit: vi.fn().mockResolvedValue(undefined) },
+    writeProjectFile: vi.fn().mockResolvedValue(undefined),
+    reloadPreview: vi.fn(),
+    domEditSaveTimestampRef: makeRef(0),
+  });
+
+  const makeSession = (hasEl = true) =>
+    ({
+      getElement: vi.fn().mockReturnValue(hasEl ? { id: "hf-abc" } : null),
+      removeElement: vi.fn(),
+      serialize: vi.fn().mockReturnValue("<html>after</html>"),
+    }) as unknown as Parameters<typeof sdkDeletePersist>[3];
+
+  it("returns false when session is null", async () => {
+    expect(await sdkDeletePersist("hf-abc", "before", "/comp.html", null, makeDeps())).toBe(false);
+  });
+
+  it("returns false when element not found in session", async () => {
+    const session = makeSession(false);
+    expect(await sdkDeletePersist("hf-abc", "before", "/comp.html", session, makeDeps())).toBe(
+      false,
+    );
+  });
+
+  it("calls removeElement and writes serialized content", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    const result = await sdkDeletePersist("hf-abc", "before", "/comp.html", session, deps);
+    expect(result).toBe(true);
+    expect(session!.removeElement).toHaveBeenCalledWith("hf-abc");
+    expect(deps.writeProjectFile).toHaveBeenCalledWith("/comp.html", "<html>after</html>");
+  });
+
+  it("records edit history with before/after diff", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    await sdkDeletePersist("hf-abc", "before-content", "/comp.html", session, deps);
+    expect(deps.editHistory.recordEdit).toHaveBeenCalledWith(
+      expect.objectContaining({
+        label: "Delete element",
+        files: { "/comp.html": { before: "before-content", after: "<html>after</html>" } },
+      }),
+    );
+  });
+
+  it("calls reloadPreview on success", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    await sdkDeletePersist("hf-abc", "before", "/comp.html", session, deps);
+    expect(deps.reloadPreview).toHaveBeenCalled();
+  });
+
+  it("returns false and does not write on removeElement error", async () => {
+    const deps = makeDeps();
+    const session = makeSession(true);
+    (session!.removeElement as ReturnType<typeof vi.fn>).mockImplementation(() => {
+      throw new Error("remove failed");
+    });
+    const result = await sdkDeletePersist("hf-abc", "before", "/comp.html", session, deps);
+    expect(result).toBe(false);
+    expect(deps.writeProjectFile).not.toHaveBeenCalled();
+    expect(deps.reloadPreview).not.toHaveBeenCalled();
+  });
+});
+
 describe("sdkCutoverPersist — GSAP script preservation (integration)", () => {
   const makeRef = <T>(val: T): MutableRefObject<T> => ({ current: val });
   const makeDeps = () => ({

packages/studio/src/utils/sdkCutover.ts

@@ -76,6 +76,26 @@ interface CutoverOptions {
   coalesceKey?: string;
 }
 
+// ponytail: internal; export only if a third caller appears
+async function persistSdkSerialize(
+  sdkSession: Composition,
+  targetPath: string,
+  originalContent: string,
+  deps: CutoverDeps,
+  options?: CutoverOptions,
+): Promise<void> {
+  const after = sdkSession.serialize();
+  deps.domEditSaveTimestampRef.current = Date.now();
+  await deps.writeProjectFile(targetPath, after);
+  await deps.editHistory.recordEdit({
+    label: options?.label ?? "Edit layer",
+    kind: "manual",
+    ...(options?.coalesceKey ? { coalesceKey: options.coalesceKey } : {}),
+    files: { [targetPath]: { before: originalContent, after } },
+  });
+  deps.reloadPreview();
+}
+
 export async function sdkCutoverPersist(
   selection: DomEditSelection,
   ops: PatchOperation[],
@@ -96,16 +116,7 @@ export async function sdkCutoverPersist(
         sdkSession.dispatch(editOp);
       }
     });
-    const after = sdkSession.serialize();
-    deps.domEditSaveTimestampRef.current = Date.now();
-    await deps.writeProjectFile(targetPath, after);
-    await deps.editHistory.recordEdit({
-      label: options?.label ?? "Edit layer",
-      kind: "manual",
-      ...(options?.coalesceKey ? { coalesceKey: options.coalesceKey } : {}),
-      files: { [targetPath]: { before: originalContent, after } },
-    });
-    deps.reloadPreview();
+    await persistSdkSerialize(sdkSession, targetPath, originalContent, deps, options);
     trackStudioEvent("sdk_cutover_success", { hfId, opCount: ops.length });
     return true;
   } catch (err) {
@@ -116,3 +127,24 @@ export async function sdkCutoverPersist(
     return false;
   }
 }
+
+export async function sdkDeletePersist(
+  hfId: string,
+  originalContent: string,
+  targetPath: string,
+  sdkSession: Composition | null | undefined,
+  deps: CutoverDeps,
+): Promise<boolean> {
+  if (!sdkSession || !sdkSession.getElement(hfId)) return false;
+  try {
+    sdkSession.removeElement(hfId);
+    await persistSdkSerialize(sdkSession, targetPath, originalContent, deps, {
+      label: "Delete element",
+    });
+    trackStudioEvent("sdk_cutover_success", { hfId, opCount: 1 });
+    return true;
+  } catch (err) {
+    trackStudioEvent("sdk_cutover_fallback", { hfId, error: String(err) });
+    return false;
+  }
+}