Fix import statements

Remove unused or unneeded imports and change imports of luxon APIs to
use the wrapper.

components/TableScheduleEventSlots.vue

@@ -196,7 +196,7 @@
 </template>
 
 <script lang="ts" setup>
-import { DateTime, Duration } from 'luxon';
+import { DateTime, Duration } from '~/shared/utils/luxon';
 import type { Id } from '~/shared/types/common';
 import { enumerate, pairs, toId } from '~/shared/utils/functions';