Full-width mission editor and archive actions

Uses the full browser width only while editing an individual mission
Prevents empty or invalid 2D/3D survey geometry from being submitted
Replaces the nonexistent drawing-mode instruction with direct map guidance
Adds draggable markers for 2D/3D polygon corners and the POI center
Keeps existing draggable waypoint markers and live route recalculation
Makes archive, restore, and delete actions use the same button system
Removes the request-time job that automatically purged hidden missions after 12 months
Transparently documents restricted system retention in all four Terms languages
Requires renewed acceptance of the materially updated Terms
Universal install/update package supports Betas 0.15 through 0.30