fix(medications): localise time-window range string

`formatTimeWindowRange` used to hard-code the German "bis ... Uhr"
suffix, so an English-locale user saw "Today, 19:00 bis 23:00 Uhr"
on the medication card and the medication form. Pass the active
locale through and emit "19:00 – 23:00" for English while keeping
the existing German output for DE users (and unchanged for legacy
call sites that still don't pass a locale).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/medications/medication-card.tsx

@@ -193,7 +193,7 @@ function isLastIntakeInCurrentWindow(
 
 export function MedicationCard({ medication, onEdit }: MedicationCardProps) {
   const queryClient = useQueryClient();
-  const { t } = useTranslations();
+  const { t, locale } = useTranslations();
   const fmt = useFormatters();
   const [intakeLoading, setIntakeLoading] = useState<string | null>(null);
 
@@ -438,6 +438,7 @@ export function MedicationCard({ medication, onEdit }: MedicationCardProps) {
               {formatTimeWindowRange(
                 currentWindowStatus.schedule!.windowStart,
                 currentWindowStatus.schedule!.windowEnd,
+                locale,
               )}
             </span>
           </p>
@@ -490,7 +491,7 @@ export function MedicationCard({ medication, onEdit }: MedicationCardProps) {
                   {t("medications.nextIntake")}
                 </span>{" "}
                 {dayLabel && `${dayLabel}, `}
-                {formatTimeWindowRange(s.windowStart, s.windowEnd)}
+                {formatTimeWindowRange(s.windowStart, s.windowEnd, locale)}
                 {s.label && (
                   <span className="hidden sm:inline"> ({s.label})</span>
                 )}

src/components/medications/medication-form.tsx

@@ -131,16 +131,17 @@ function formatNextWindowSummary(
   schedule: Schedule,
   t: TranslateFn,
   formatShortDate: (date: Date) => string,
+  locale: "de" | "en",
 ): string {
   const isSimpleDaily =
     schedule.daysOfWeek.length === 0 && schedule.intervalWeeks === 1;
   if (isSimpleDaily) {
-    return `${t("medications.nextSchedulePrefix")} ${t("medications.nextScheduleDaily")}, ${formatTimeWindowRange(schedule.windowStart, schedule.windowEnd)}`;
+    return `${t("medications.nextSchedulePrefix")} ${t("medications.nextScheduleDaily")}, ${formatTimeWindowRange(schedule.windowStart, schedule.windowEnd, locale)}`;
   }
 
   const nextDate = getNextRecurrenceDate(schedule);
   const nextText = nextDate
-    ? `${formatShortDate(nextDate)}, ${formatTimeWindowRange(schedule.windowStart, schedule.windowEnd)}`
+    ? `${formatShortDate(nextDate)}, ${formatTimeWindowRange(schedule.windowStart, schedule.windowEnd, locale)}`
     : "—";
   return `${t("medications.nextSchedulePrefix")} ${nextText}`;
 }
@@ -234,7 +235,7 @@ export function MedicationForm({
   initial,
 }: MedicationFormProps) {
   const queryClient = useQueryClient();
-  const { t } = useTranslations();
+  const { t, locale } = useTranslations();
   const fmt = useFormatters();
 
   const doseUnits = [
@@ -565,7 +566,7 @@ export function MedicationForm({
                     `${t("medications.formSchedule")} ${i + 1}`}
                 </span>{" "}
                 <span className="text-foreground/70 font-normal">
-                  ({formatNextWindowSummary(s, t, fmt.dateShort)})
+                  ({formatNextWindowSummary(s, t, fmt.dateShort, locale)})
                 </span>
               </p>
               <DropdownMenu>