fix: keep portfolio panels above journey world

tests/browser/scene-controls.spec.ts

@@ -41,6 +41,43 @@ test('keeps the desktop identity and navigation in a paint layer above the world
   expect(layers.headerOpacity).toBeGreaterThanOrEqual(0.94);
 });
 
+test('keeps a scrolled content panel in a geometry-safe paint layer above the world', async ({ page, distUrl }) => {
+  await page.setViewportSize({ width: 1440, height: 900 });
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+  await page.locator('nav a[href="#profile"]').click();
+
+  const layers = await page.evaluate(() => {
+    const world = document.querySelector<HTMLElement>('.journey-world');
+    const main = document.querySelector<HTMLElement>('.portfolio-main');
+    const panel = document.querySelector<HTMLElement>('#profile');
+    const heading = document.querySelector<HTMLElement>('#profile-heading');
+    if (!world || !main || !panel || !heading) throw new Error('Missing scrolled panel structure');
+    const mainStyle = getComputedStyle(main);
+    const panelStyle = getComputedStyle(panel);
+    const headingRect = heading.getBoundingClientRect();
+    return {
+      worldZ: Number(getComputedStyle(world).zIndex),
+      mainIsolation: mainStyle.isolation,
+      mainPosition: mainStyle.position,
+      headingVisible:
+        headingRect.width > 0
+        && headingRect.height > 0
+        && headingRect.bottom > 0
+        && headingRect.top < window.innerHeight,
+      panelOpacity: Number.parseFloat(panelStyle.backgroundColor.match(/[\d.]+(?=\))/gu)?.at(-1) ?? '1'),
+    };
+  });
+
+  expect(layers).toMatchObject({
+    worldZ: 0,
+    mainIsolation: 'isolate',
+    mainPosition: 'static',
+    headingVisible: true,
+  });
+  expect(layers.panelOpacity).toBeGreaterThanOrEqual(0.94);
+  await expect(page).toHaveURL(`${distUrl}/#profile`);
+});
+
 test('provides native motion and quality controls with visible state', async ({ page, distUrl }) => {
   await page.goto(distUrl, { waitUntil: 'domcontentloaded' });