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>