fix: T4a browser check findings

- Withdrawal wording from one backend helper everywhere ("bis
  einschließlich TT.MM. – ab TT.MM. wieder erntefähig", year when it
  crosses New Year); withdrawal-status returns lastBlockedDay and the
  ready text, the frontend no longer computes dates
- Calendar events name colony or apiary, withdrawal events carry
  product and detail; compact withdrawal rows on mobile
- One bottling warning per colony and treatment; pre-save hint
- Offline: online-only actions disabled with a reason, cached data
  shows its timestamp, open sheets block submit offline
- Mobile: no horizontal scroll at 360 px, touch targets >= 44 px,
  toasts and the add button no longer cover content
- Cleanup sheet without destructive preselection; natural sort of
  colony codes; collapsible automation rule cards; varroa list newest
  first with chart axes; text fixes

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Frontend/src/components/tab-switcher.tsx

@@ -20,7 +20,7 @@ export function TabSwitcher<T extends string>({ tabs, value, onChange }: TabSwit
           aria-selected={value === tab.value}
           onClick={() => onChange(tab.value)}
           className={cn(
-            "rounded-lg px-4 py-1.5 text-sm font-medium transition-colors",
+            "min-h-11 sm:min-h-9 rounded-lg px-4 py-1.5 text-sm font-medium transition-colors motion-reduce:transition-none",
             value === tab.value
               ? "bg-card text-foreground shadow-[var(--shadow-soft)]"
               : "text-muted-foreground hover:text-foreground",