Boundary offsets and Planner airport layers

Fixes the WebODM Boundary client-side normalization so the 8 m and 10 m offset buttons remain selected and are saved instead of falling back to 4 m.
Removes the Coordinates / GeoJSON disclosure from the Boundary popup to keep the workflow focused on the visual coverage and Boundary editor.
Adds the worldwide airport orientation layer to the main Mission Planner map and the WebODM Boundary popup map.
Shows airport orientation points in Mission Planner even where a fresh official national geozone source exists, while leaving Risk Assessment airport suppression and official geozone logic unchanged.
Updates the Boundary popup explanation so it no longer refers to copying GeoJSON and makes the airport layer's orientation-only role clear.