feat: Add dynamic 'Last snoozed' option with reactive updates

- Add 'UNTIL_LAST_CUSTOM_TIME' snooze option that shows saved custom time
- Implement smart expiration: times expire when passed OR after 7 days
- Add user-friendly format: 'Sat, 23 Aug, 8.16pm'
- Fix caching issue: actions now update dynamically without page refresh
- Auto-save custom times to localStorage for quick reuse
- Add reactive event system for real-time UI updates
- Include option filtering to show/hide based on saved time availability

Improves UX by allowing users to quickly reuse their last custom snooze time
without having to re-enter it every time.

app/javascript/dashboard/components/CustomSnoozeModal.vue

@@ -31,6 +31,7 @@ export default {
         const unixTimestamp = getUnixTime(this.snoozeTime);
         // Save the custom time to localStorage for future use
         saveLastCustomSnoozeTime(unixTimestamp);
+        // The saveLastCustomSnoozeTime function will emit the event automatically
         this.$emit('chooseTime', this.snoozeTime);
       }
     },