Add comprehensive test suite for today package handlers.
- Add tests for current/next appointment, today appointments, and pending approvals
- Uses testutils.SetupTestDB for isolated test database
- Follows established test patterns in the codebase
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
