Enable Calendar Sharing via Public ICS/iCal Subscription Link

My feature request is to add the ability to generate a secure, read-only calendar subscription link (in .ics / iCal format).

This would allow for two major use cases:

• Sharing with others: I could share my full availability with my partner, team, or clients, allowing them to subscribe to my schedule in their own calendar app (like Google Calendar, Apple Calendar, etc.).

• System Integration: I could feed my complete Akiflow schedule into other dashboards or systems that support iCal feeds.

This is a standard feature in most calendar applications and would make the powerful, unified view that Akiflow creates even more valuable by making it portable.