EntropyDip/gym_universitario ? reverse-engineered prompt

Build me a Python app for managing a university gym that only the administrator or gym manager uses.

I want it to let me register students, create and cancel reservations, reactivate canceled ones, and record actual visits with the time spent and the equipment used. It should enforce the gym rules, like limited capacity per time slot, a maximum number of active reservations per student each week, and operating hours from morning to evening in fixed time blocks. If a student has an email saved, send a confirmation when a reservation is created or reactivated, but if email settings are missing, the app should still work normally.

Please make it with a clean desktop interface, organized in separate sections for users, reservations, visits, priorities, and statistics. I also want charts and useful summaries, like the busiest time slot, most common academic program, average visit duration, and most used equipment. Keep the code well organized and testable, with clear error handling and a simple way to run it from the main file. If you need current library details, look them up online.