User administration, personal statistics, and corrected oblique coverage

Reorders the administration dashboard into the requested five-row, three-column workflow and simplifies its labels
Lets administrators and organization administrators create validated users within their permitted scope
Shows a one-time printable access sheet while retaining only the password hash in the database
Adds My drones and personal Statistics cards to the user dashboard
Counts mission exports separately from saves and presents personal mission and risk-assessment totals
Offsets each 45-degree oblique 3D flight by altitude × tan(45°) opposite its optimized viewing direction
Includes the expanded oblique paths in total duration and battery-reserve calculations
Removes redundant flags and language codes from the open language menu