VSN-2685/ feat: add mission planning module with list/calendar views and inspection sync
This MR includes the following changes :
- Add a mission planning screen with two views: a list view (with status filter tabs) and a calendar view, letting drivers see all their assigned inspection missions.
- Mission detail screen shows the scheduled vehicle, date/time, and a button to start the linked inspection directly from the mission.
- Mission status is now derived from the real inspection status (e.g. a mission stays "In progress" while the inspection is pending signature, and only moves to "Completed" once the inspection is fully signed).