- Fix match arms with identical bodies by consolidating patterns
- Fix case-insensitive file extension comparisons using eq_ignore_ascii_case
- Fix unnecessary Debug formatting in log/format macros
- Fix clone_from usage instead of clone assignment
- Fix let...else patterns where appropriate
- Fix format! append to String using write! macro
- Fix unwrap_or with function calls to use unwrap_or_else
- Add missing fields to manual Debug implementations
- Fix duplicate code in if blocks
- Add type aliases for complex types
- Rename struct fields to avoid common prefixes
- Various other clippy warning fixes
Note: Some 'unused async' warnings remain for functions that are
called with .await but don't contain await internally - these are
kept async for API compatibility.
- Add email, teams, google columns to attendant.csv
- Add find_attendant_by_identifier() for multi-channel lookup
- Add find_attendants_by_channel() and find_attendants_by_department()
- Implement handle_status_command with database persistence
- Implement handle_transfer_command with actual transfer logic
- Update AttendantCSV struct with all new fields
