Improve error handling and authentication for uploads and notifications

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

src/lib/notificationService.ts

@@ -67,7 +67,7 @@ class NotificationService {
       return { success: true };
     } catch (error: any) {
       console.error('Error creating Novu subscriber:', error);
-      return { success: false, error: error.message };
+      return { success: false, error: error instanceof Error ? error.message : 'An unexpected error occurred' };
     }
   }
 
@@ -91,7 +91,7 @@ class NotificationService {
       return { success: true };
     } catch (error: any) {
       console.error('Error updating Novu subscriber:', error);
-      return { success: false, error: error.message };
+      return { success: false, error: error instanceof Error ? error.message : 'An unexpected error occurred' };
     }
   }
 

src/lib/versioningHelpers.ts

@@ -77,7 +77,7 @@ export async function createEntityVersion(params: {
       console.error('Error creating entity version:', error);
       toast({
         title: 'Version Creation Failed',
-        description: error.message,
+        description: error instanceof Error ? error.message : 'An unexpected error occurred',
         variant: 'destructive',
       });
       return null;