Mobile category structural changes

models/category.ts

@@ -1,4 +1,4 @@
-import { Shelf } from "./shelf";
+import { MobileShelf, Shelf } from "./shelf";
 
 export interface Category { //_id is not needed as it is created by default
     name: string,
@@ -11,6 +11,7 @@ export interface MongoCategory extends Omit<Category, 'shelves'> {
     shelves?: Array<string>, // Shelf IDs
 }
 
-export interface MobileCategory extends Category {
+export interface MobileCategory extends Omit<Category, 'shelves'> {
     _id: string,
+    shelves?: Array<MobileShelf>
 }