ZIP codes that start with a zero now save correctly

Locations with a ZIP code that begins with a zero — most of New England, plus Puerto Rico — showed it in Salon Settings with the leading zero missing. An Andover, MA location at 01810 appeared as 1810. Correcting it by hand didn't help: the zero was dropped again the moment you saved.

Both halves are fixed. The ZIP now displays in full everywhere it appears, and a correction you type now sticks. Existing locations were repaired automatically — there's nothing to re-enter.

ZIP codes outside the plain five-digit format (ZIP+4, and non-US postal codes containing letters) are left exactly as entered rather than being reformatted.