Create button becomes unclickable after validation error on name field (>32 chars)

## Steps to reproduce

1. Open the activity category creation dialog
2. Enter a name longer than 32 characters
3. Observe the validation error

## Expected behavior

After editing the name to a valid value (<= 32 chars), the "Create" button should become clickable again.

## Actual behavior

The "Create" button remain unclickable with a loading picto even after correcting the name to a valid length. All the fields are still editable.

## Environment
Web version (safari version 26.3)

Thanks :)