- Appointment date picker disables days before today.
- Invoice issue-date picker disables past days by default, with an opt-in
"Back-date" checkbox for recording older invoices (edit mode keeps past
dates). Added invoices.dialog.backdate to all locales.
- Removed the inert, outdated "Features" section (patient-owned storage /
require signed toggles) from Settings and its now-unused i18n keys.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Khalid Abdi