Introduces logbook sharing with read, write, and admin permission levels via a new station_logbooks_permissions table and related migration. Updates controllers, models, and views to support managing collaborators, restricts sensitive actions to owners/admins, and adds UI for sharing management. Also adds user lookup by callsign and improves logbook/station location access logic.
Introduces a new 'public_radio_status' field to station logbooks, allowing users to enable or disable the display of radio status on public logbook pages. Updates migration, controllers, model, views, and language files to support this feature and provide UI controls for toggling the option.
- Set active logbooks checks if logbook belongs to user
- Link station to logbook checks that station and logbook belong to user
- Unlink station from logbook checks that station and logbook belong to user
- Edit of logbook only shows stations of user
- Set active station checks if station belongs to user
- find_active and find_gridsquare of Stations model now check user
