Upload UI ignores "accept" property (file type filter) #7061
Description
Description
If you allow only .csv files, and drag a jpg file (or e.g. text from a notepad) on vaadin-upload, it looks like it would be just fine to drop it. Then when you drop it, some internals of the component properly skips accepting that, but no indication is given to user -> thus it looks like the component is broken.
Expected outcome
There should be some hint in UI that invalid d&d payload (other but files matching the accept filter) will not be accepted.
Minimal reproducible example
Steps to reproduce
Try to drag text clip form notepad on vaadin-upload.
Environment
Vaadin version(s): 24.3.2
OS: Mac
Browsers
No response