Flickering with big avatars

### Describe the bug

When using a big avatar, there is a quick flickering because the image is first loaded in full size and then it gets resized

### Expected behavior

It shouldn't cause the flickering

### Minimal reproducible example

It can be seen in the demo

### Add-on Version

3.0.0-SNAPSHOT

### Vaadin Version

24.8.0

### Additional information

_No response_