Add complete CRUD interface for role management under /admin/roles.
- Index page with table showing name, description, permission_set_name, is_system_role
- Show page for role details
- Form component for create/edit with permission_set_name dropdown
- System role badge and disabled delete button
- Flash messages for success/error
- Authorization checks using MvWeb.Authorization helpers
- Comprehensive test coverage (22 tests)
Routes added under /admin scope. All LiveViews load user role
for authorization checks. Form uses custom dropdown for permission sets.
- Fix get_last_completed_cycle to find most recent completed cycle
- Fix create_cycle helpers to delete auto-generated cycles first
- Fix Ash.destroy return value handling
- Fix form selectors to use specific IDs
- Fix URL parameter names for filters
- Fix Ash.read_one return value expectations in tests
- Normalize checkbox 'on' value to boolean true in settings
- Change Payment Data layout to flex-nowrap for horizontal display
- Replace membership fee type dropdown with display-only view
- Fix tests to use correct button selectors and switch to membership fees tab
