fix: add fallbacks for env vars

src/components/shows/TimeSlotList.vue

@@ -79,8 +79,10 @@ import { usePaginatedList } from '@rokoli/bnb/drf'
 import { useFormattedISODate } from '@/util'
 import { addDays } from 'date-fns'
 
-const DEFAULT_TIMESLOT_LIMIT = parseInt(import.meta.env.VUE_APP_TIMESLOT_FILTER_DEFAULT_NUMSLOTS)
-const DEFAULT_DATE_OFFSET = parseInt(import.meta.env.VUE_APP_TIMESLOT_FILTER_DEFAULT_DAYS)
+const DEFAULT_TIMESLOT_LIMIT = parseInt(
+  import.meta.env.VUE_APP_TIMESLOT_FILTER_DEFAULT_NUMSLOTS ?? 10,
+)
+const DEFAULT_DATE_OFFSET = parseInt(import.meta.env.VUE_APP_TIMESLOT_FILTER_DEFAULT_DAYS ?? 60)
 
 defineOptions({
   compatConfig: { MODE: 3 },