✅(e2e) reduce flakiness in e2e tests

Flakiness in e2e tests has been reduced by:
- Adding waits for media-check processing in image tests.
- Ensuring that slash menu resets are handled
correctly to avoid flakiness.
- Wait for the Download button to be stable before clicking

src/frontend/apps/e2e/__tests__/app-impress/config.spec.ts

@@ -47,6 +47,10 @@ test.describe('Config', () => {
 
     await expect(image).toBeVisible();
 
+    // Wait for the media-check to be processed
+    // eslint-disable-next-line playwright/no-wait-for-timeout
+    await page.waitForTimeout(1000);
+
     // Check src of image
     expect(await image.getAttribute('src')).toMatch(
       /http:\/\/localhost:8083\/media\/.*\/attachments\/.*.png/,