Save scheduled messages instead of deleting them when they can't be sent

Problem statement:

When a last-minute booking is received (less than 24 hours before check-in), scheduled messages like check-in instructions are completely deleted instead of being saved for manual use. This creates significant friction when the host eventually accepts the booking and needs to send those instructions.

Current workaround:

Hosts must manually locate the correct template and recreate the message from scratch, ensuring all dynamic fields (guest name, door code, check-in info, host name) are correctly populated — often while on mobile.

Impact:

• Wastes time reconstructing messages that were already prepared
• Particularly difficult when managing bookings on mobile while away from a computer
• Risk of errors when manually populating dynamic fields
• Poor guest experience due to delayed communication

Proposed solution:

When a scheduled message cannot be sent automatically (e.g., due to a last-minute booking), save the message in a "pending" or "draft" state so hosts can easily review and manually send it once the booking is accepted.

Unlock:

Hosts would be able to quickly send pre-populated messages to last-minute guests without manually reconstructing them, saving time and reducing errors — especially when managing bookings on mobile.