All trainer attendance records are stored as subject_type=User::class with
subject_id=user.id (via GenerateTrainerAttendance listener). Multiple places
were querying the wrong type ('trainer', 'staff', or Trainer::class), returning
zero results. Fixed: ReportService, GenerateTrainerCompensation, Dashboard,
TrainerShow. Added trainer self-attendance section to TrainerDashboard with
rate, breakdown, and recent records.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>