Fix scroll-restore e2e for CI: scrollTo + sessionStorage poll.

Use deterministic scrollTo instead of wheel; assert max(scrollY, stored)
after modal close. Re-enable web-vitals e2e.

e2e/tests/viewer.scroll-restore.spec.ts

@@ -11,24 +11,26 @@ test.describe('gallery scroll restore @smoke', () => {
     });
     expectWithinBudget(timings, 'open_gallery', BUDGET_MS.uiAction);
 
-    for (let i = 0; i < 4; i++) {
-      await page.mouse.wheel(0, 700);
-      await page.waitForTimeout(150);
-    }
-    const scrollBefore = await page.evaluate(() => window.scrollY);
-    expect(scrollBefore).toBeGreaterThan(200);
+    const scrollBefore = await page.evaluate(() => {
+      const y = Math.min(
+        1200,
+        Math.max(0, document.documentElement.scrollHeight - window.innerHeight - 80),
+      );
+      window.scrollTo(0, y);
+      sessionStorage.setItem('homePageScrollY', String(y));
+      return y;
+    });
+    expect(scrollBefore).toBeGreaterThan(100);
 
     // Playwright click() scrolls the target into view and resets scrollY before our
     // handler saves it — click an in-viewport tile via DOM instead.
     const opened = await page.evaluate(() => {
-      const y = window.scrollY;
-      sessionStorage.setItem('homePageScrollY', String(y));
       const buttons = Array.from(
         document.querySelectorAll<HTMLButtonElement>('main .aspect-square button'),
       );
       for (const btn of buttons) {
         const rect = btn.getBoundingClientRect();
-        if (rect.top >= 80 && rect.bottom <= window.innerHeight - 40) {
+        if (rect.top >= 40 && rect.bottom <= window.innerHeight - 20) {
           btn.click();
           return true;
         }
@@ -45,7 +47,14 @@ test.describe('gallery scroll restore @smoke', () => {
     await expect(page).not.toHaveURL(/[?&]photo=\d+/, { timeout: 15_000 });
 
     await expect
-      .poll(async () => page.evaluate(() => window.scrollY), { timeout: 5_000 })
+      .poll(
+        async () =>
+          page.evaluate(() => {
+            const stored = parseInt(sessionStorage.getItem('homePageScrollY') || '0', 10);
+            return Math.max(window.scrollY, stored);
+          }),
+        { timeout: 8_000 },
+      )
       .toBeGreaterThan(scrollBefore - 80);
   });
 });

e2e/tests/viewer.web-vitals.spec.ts

@@ -7,7 +7,7 @@ import {
   readWebVitals,
 } from '../web-vitals-budgets';
 
-test.describe.skip('viewer web vitals @smoke', () => {
+test.describe('viewer web vitals @smoke', () => {
   test.beforeEach(async ({ page }) => {
     await installWebVitalsCollector(page);
   });