fix(studio): refine preset surfaces and repair gallery interactions

packages/design-studio/test/clipboard.test.ts

@@ -0,0 +1,62 @@
+import { expect, test } from "bun:test";
+import { handlePreviewClipboard } from "../src/preview-clipboard.ts";
+
+test("clipboard broker accepts only current preview frames and bounded user-initiated text", async () => {
+  const results: unknown[] = [];
+  const source = { postMessage: (value: unknown) => results.push(value) } as unknown as Window;
+  const frames = [{ contentWindow: source, src: "https://example.test/preview/current" }];
+  const event = {
+    source,
+    data: {
+      type: "wrn-studio-copy",
+      id: "copy-1",
+      path: "/preview/current",
+      text: "npm install @wrnexus/ui",
+    },
+  };
+  const copied: string[] = [];
+  const write = async (text: string) => {
+    copied.push(text);
+  };
+  expect(await handlePreviewClipboard(event, frames, write)).toBe(true);
+  expect(copied).toEqual(["npm install @wrnexus/ui"]);
+  expect(results).toEqual([{ type: "wrn-studio-copy-result", id: "copy-1", ok: true }]);
+  expect(await handlePreviewClipboard({ ...event, source: null }, frames, write)).toBe(false);
+  expect(
+    await handlePreviewClipboard(
+      { ...event, data: { ...event.data, path: "/preview/old" } },
+      frames,
+      write,
+    ),
+  ).toBe(false);
+  expect(
+    await handlePreviewClipboard(
+      { ...event, data: { ...event.data, text: "x".repeat(16385) } },
+      frames,
+      write,
+    ),
+  ).toBe(false);
+  expect(await handlePreviewClipboard(event, frames, write, false)).toBe(true);
+  expect(copied).toHaveLength(1);
+  expect(results.at(-1)).toEqual({ type: "wrn-studio-copy-result", id: "copy-1", ok: false });
+});
+
+test("clipboard denial reports failure rather than claiming a copy succeeded", async () => {
+  let result: any;
+  const source = {
+    postMessage: (value: unknown) => {
+      result = value;
+    },
+  } as unknown as Window;
+  await handlePreviewClipboard(
+    {
+      source,
+      data: { type: "wrn-studio-copy", id: "copy-2", path: "/preview/current", text: "test" },
+    },
+    [{ contentWindow: source, src: "https://example.test/preview/current" }],
+    async () => {
+      throw Error("denied");
+    },
+  );
+  expect(result.ok).toBe(false);
+});