Refactor PhotoUpload component to fetch session token before polling, enhance error handling in NotificationService and versioningHelpers with `instanceof Error` checks, and add comprehensive validation for request body fields in the create-novu-subscriber Supabase function.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 8d708ff6-09f1-4b67-8edc-de3fcb2349b3
Replit-Commit-Checkpoint-Type: intermediate_checkpoint