Stabilize e2e logout propagation test

tests/e2e/events.test.ts

@@ -66,6 +66,13 @@ test.describe('events', () => {
     // Verify page2 is logged in
     await expect(page2.getByRole('link', {name: 'Sign In'})).toBeHidden();
 
+    // Give page2's SharedWorker time to register its SSE connection on the
+    // server — otherwise the logout event can race the connection and be
+    // silently dropped. See https://github.com/go-gitea/gitea/pull/37403
+    // In the future, we can set an attribute to HTML page when the connection is established,
+    // then here we can just wait for that attribute (it should also work for the planned WebSocket SharedWorker)
+    await page2.waitForTimeout(500); // eslint-disable-line playwright/no-wait-for-timeout
+
     // Logout from page1 — this sends a logout event to all tabs
     await page1.goto('/user/logout');