Native HTML5 pattern validation, mirroring the same rules the backend now enforces (Orders.ts/Customers.ts, same commit on that repo): PLZ digit count by country (5/DE, 4/AT+CH), Packstationnummer 1-3 digits, Postnummer 6-10 digits — catches the exact mix-up (long number in Packstationnummer, short number in Postnummer) found in a real order's data while investigating this. Client-side only for instant feedback; the backend re-validates regardless.
Also bumps @einfach-produktiv/invoicing to pick up the invoice PDF layout fixes (centered footer, clustered summary rows, relocated paid badge, stacked Packstation/Postnummer address lines).
Marco
03a29cf93c