Error Handling Hardening

Audit and improve error handling in {{file_or_module_path}}.

Current state: {{current_error_handling}}

Audit checklist:
1. **Unhandled promises**: Find any async operations missing try/catch or .catch()
2. **Silent failures**: Find catch blocks that swallow errors without logging or rethrowing
3. **Generic catches**: Replace catch(e) with specific error type handling where appropriate
4. **User-facing errors**: Ensure errors shown to users are helpful, not stack traces
5. **API boundaries**: Verify all API calls handle network errors, timeouts, and unexpected response shapes
6. **Validation gaps**: Find inputs that aren't validated before use

For each issue, provide:
- Location (file:line or function name)
- Current code
- Fixed code
- Why this matters (what could go wrong in production)

Then add:
- A centralized error handler if the project doesn't have one
- Retry logic for transient failures (network, rate limits) with exponential backoff
- Error boundary components for React UI sections that could crash