Add barcode-detector-api-polyfill dependency and update environment variable declarations in SvelteKit project

node_modules/@zxing/library/cjs/customTypings.js

@@ -0,0 +1,10 @@
+"use strict";
+/**
+ * This file contains some types to make our
+ * lifes easier when copy and pasting Java code.
+ * With it we can keep int, float, etc., references
+ * in code to keep as close as possible as the Java version
+ * but without the need to sacrifice ourselves with boring
+ * and annoying things.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });