Tabler's form-check-single modifier zeroes margin on .form-check-input,
which cancels the -2rem margin-inline-start the base .form-check rule
relies on to offset the checkbox into its label's padding gutter. That
left checkboxes floating almost flush against their label text.
Removed the form-check-single class from all 9 affected checkboxes:
6 in NotificationSettings, 1 each in DnsProviderForm, IntegrationForm,
and IntegrationEditForm.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>