fix: E2E test stability and UI performance improvements (#823)

apps/ui/tests/features/responsive/agent-output-modal-responsive.spec.ts

@@ -13,6 +13,7 @@ import {
   waitForNetworkIdle,
   authenticateForTests,
   handleLoginScreenIfPresent,
+  dismissSandboxWarningIfVisible,
 } from '../../utils';
 
 const TEST_TEMP_DIR = createTempDirPath('responsive-modal-test');
@@ -100,6 +101,9 @@ test.describe('AgentOutputModal Responsive Behavior', () => {
 
     await expect(page.locator('[data-testid="board-view"]')).toBeVisible({ timeout: 10000 });
 
+    // Dismiss sandbox warning dialog if it appears (blocks pointer events)
+    await dismissSandboxWarningIfVisible(page);
+
     // Wait for the verified feature card to appear
     const featureCard = page.locator(`[data-testid="kanban-card-${featureId}"]`);
     await expect(featureCard).toBeVisible({ timeout: 10000 });