Filter 'New Reservation' notifications by check-in date range

Currently, 'New Reservation' notifications trigger immediately for all bookings regardless of the date. This creates noise for long-term bookings and lacks the urgency needed for near-term ones.

The request is to add a filter (e.g., "within the next 7 days") so that teammates are only alerted when a new booking is made for a date in the immediate future. This is critical for operational tasks that require advance notice, such as ordering laundry.