Prevent overwriting the global taf object

src/utils/globalTaf.mjs

@@ -1,11 +1,18 @@
 import { hideMessageText } from "./feature_flags/rollModeMessageContent.mjs";
 
-globalThis.taf = Object.freeze({
+Object.defineProperty(
+	globalThis,
+	`taf`,
+	{
+		value: Object.freeze({
 			utils: Object.freeze({
 				hideMessageText,
 			}),
-	FEATURES: {
+			FEATURES: Object.preventExtensions({
 				ROLL_MODE_CONTENT: false,
 				STORABLE_SHEET_SIZE: false,
+			}),
+		}),
+		writable: false,
 	},
-});
+);