refactor: prevent custom field overriding prototype property

packages/utils/src/customField-utils/customFieldUtils.ts

@@ -1,5 +1,7 @@
 import type { CustomFields } from 'ontime-types';
 
+const objectPrototypeKeys = new Set(Object.getOwnPropertyNames(Object.prototype));
+
 /**
  * Transforms an alphanumeric label with spaces into a valid key
  */
@@ -7,6 +9,13 @@ export function customFieldLabelToKey(label: string): string {
   return label.trim().replaceAll(' ', '_');
 }
 
+/**
+ * Detects keys that collide with Object prototype properties or methods
+ */
+export function isObjectPrototypeKey(key: string): boolean {
+  return objectPrototypeKeys.has(key);
+}
+
 /**
  * Finds an object key in the CustomFields object that matches the given label
  */