feat: implement splash screen handling in navigation and interactions

- Added a new function `waitForSplashScreenToDisappear` to manage splash screen visibility, ensuring it does not block user interactions.
- Integrated splash screen checks in various navigation functions and interaction methods to enhance user experience by waiting for the splash screen to disappear before proceeding.
- Updated test setup to disable the splash screen during tests for consistent testing behavior.

apps/ui/tests/utils/views/agent.ts

@@ -1,5 +1,5 @@
 import { Page, Locator } from '@playwright/test';
-import { waitForElement } from '../core/waiting';
+import { waitForElement, waitForSplashScreenToDisappear } from '../core/waiting';
 
 /**
  * Get the session list element
@@ -19,6 +19,8 @@ export async function getNewSessionButton(page: Page): Promise<Locator> {
  * Click the new session button
  */
 export async function clickNewSessionButton(page: Page): Promise<void> {
+  // Wait for splash screen to disappear first (safety net)
+  await waitForSplashScreenToDisappear(page, 3000);
   const button = await getNewSessionButton(page);
   await button.click();
 }