Update edge function wrapper to emit backend metadata headers (X-Request-Id, X-Span-Id, X-Trace-Id, X-Duration-Ms) on responses; adjust logging to include duration and headers. Enhance edgeFunctionTracking to extract and propagate backend metadata from responses and errors; extend errorHandler to capture and log backend metadata for improved observability.
Improve CORS handling and error logging to fix moderation edge cases:
- Add x-idempotency-key to allowed CORS headers and expose explicit POST methods
- Extend CORS headers to include Access-Control-Allow-Methods
- Update edge function tracing and client error handling to better detect and log CORS/network issues
- Enhance error handling utilities to surface CORS-related failures and provide clearer user messages
