Implemented `UserRepository` and `ExpenseShareRepository` to handle data fetching with a caching strategy (local DAO + remote API).
Specific changes include:
- Added `getUserById` to `UserDao` and updated `getShareById` in `ExpenseShareDao` to support nullable returns.
- Updated `APIService` and `ComDataTypes` to include endpoints and data models for User info, Expense Shares, and pluralized Expense responses.
- Refactored `ExpenseRepository` to use the updated API naming conventions and removed debug print statements.
Maurice L.
4104930ea5
