Advance M8-M11 parity workflows

web/tests/e2e/nanovdb-offscreen-page-feedback.spec.ts

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+import { expect, test } from "@playwright/test";
+
+test("M8-12 Offscreen Worker repeats the main-thread NanoVDB page sequence and pixels", async ({ page }) => {
+  test.setTimeout(90_000);
+  await page.goto("/");
+  const result = await page.evaluate(() => new Promise<any>((resolve, reject) => {
+    const worker = new Worker("/src/workers/nanovdb-offscreen-page-feedback-test.worker.ts", { type: "module" });
+    worker.onmessage = (event) => { worker.terminate(); event.data.error ? reject(new Error(event.data.error)) : resolve(event.data); };
+    worker.onerror = (event) => { worker.terminate(); reject(new Error(event.message)); };
+    worker.postMessage({});
+  }));
+  expect(result.pageCount).toBeGreaterThan(1);
+  expect(result.leafPageId).toBeGreaterThan(0);
+  expect(result.beforeLoad[0].valid).toBe(true);
+  expect(result.missing.status).toBe("READY");
+  expect(result.missing.pageIds).toEqual([result.leafPageId]);
+  expect(result.upload).toEqual({ pageId: result.leafPageId, redrawScheduled: true });
+  expect(result.queuedBeforeRedraw).toBe(1);
+  expect(result.redraws).toBe(1);
+  expect(result.afterLoad[0].valid).toBe(true);
+  expect(result.pixels.bytes).toBe(64 * 64 * 4);
+  expect(result.pixels.sha256A).toBe("87d08a77a644f37ed59609ebdd18555ab1924f9a3b30d8d084db35e7776cfb9c");
+  expect(result.pixels.sha256B).toBe(result.pixels.sha256A);
+  expect(result.scheduler).toMatchObject({ pending: false, scheduledCount: 1, redrawCount: 1, capped: false, errorCode: null });
+});