Enhance error handling and logging across all edge functions:
- Introduce a shared edgeFunctionWrapper with standardized error handling, request/response logging, tracing, and validation hooks.
- Add runtime type validation utilities (ValidationError, validators, and parse/validate helpers) and integrate into edge flow.
- Implement robust validation for incoming requests and known type mismatches, with detailed logs and structured responses.
- Add post-RPC and post-database error logging to surface type/mismatch issues early.
- Update approval/rejection entry points to leverage new validators and centralized error handling.
