Geozone maps, documented warnings, and synchronized European source registry

Added reusable geozone layers with a visibility checkbox to Risk Assessment, Logbook, statistics, aircraft-history, and Mission Planner maps.
Added compact country cards, per-country detail maps, one-click synchronization, and protected URL synchronization settings.
Registered European country sources as planned entries; only validated imported datasets become active.
Added start-point warnings within 250 m plus recorded GPS accuracy.
Added authorization confirmation and a saved-before-warning workflow for prohibited zones.
Added administrator warnings for failed or more-than-30-day-old active sources.

Changelog