Update process_approval_transaction function

Update the `process_approval_transaction` function to utilize the new `error_code` and `item_details` returned by the enhanced `validate_submission_items_for_approval` function. This will improve error handling and debugging by providing more specific information when validation fails.

src/integrations/supabase/types.ts

@@ -6458,9 +6458,11 @@ export type Database = {
       validate_submission_items_for_approval: {
         Args: { p_item_ids: string[] }
         Returns: {
+          error_code: string
           error_message: string
           invalid_item_id: string
           is_valid: boolean
+          item_details: Json
         }[]
       }
     }