Previously, pressing Enter in modal form inputs would dismiss the modal instead
of submitting the form because close buttons defaulted to type="submit". This
adds explicit type="button" to all modal close buttons to ensure Enter key
properly submits forms.
Fixes:
- New board creation via Enter key
- New workspace creation via Enter key
- New card creation via Enter key
- New list creation via Enter key
- Member invitation via Enter key
- Label creation/editing via Enter key
- Board URL updates via Enter key
- Import boards forms via Enter key
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