Fix: Resolve milestone validation errors

src/types/submissions.ts

@@ -6,7 +6,9 @@ export type EntityType =
   | 'designer' 
   | 'property_owner'
   | 'photo_edit'
-  | 'photo_delete';
+  | 'photo_delete'
+  | 'milestone'
+  | 'timeline_event';
 
 export interface PhotoSubmission {
   url: string;