- Drinks.add()/patch() now check res.ok and alert() the error text,
matching the pattern every other mutator in this file already
used (Drinks.del(), everything in Bars) — previously a rejected
name/price change just re-fetched the (unchanged) list with no
indication anything went wrong.
- Stats.reload(), Drinks.reload(), Bars.reload() now .catch() a
failed fetch/non-ok response instead of leaving an unhandled
promise rejection — a network hiccup used to leave the section
stuck on 'Lade…' forever with no visible error.
- Drinks 'Hinzufügen' and Bars 'Bar hinzufügen' are now disabled
while their POST is in flight, mirroring the submitting guard
Sale.tsx already uses — a fast double-tap could otherwise fire two
requests before the first reload() resolved.
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