Root cause: @base-ui/react's Button hard-overrides the type prop to
'button' via getButtonProps in useButton(). Even when we write
<Button type='submit'>, mergeProps replaces it with 'button' before
DOM, so the button does nothing inside a form. Visually it looks
disabled because clicking it doesn't trigger any state change.
Fix: for form submit buttons, use a native <button type='submit'>
styled with buttonVariants() to match. Onsubmit was already in place
from the previous commit — this is the missing half.
Applied to both VIN list and user list filter bars.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
38429a98cd