add comments

src/utils/storage.ts

@@ -1,5 +1,11 @@
+/**
+ * Prefix to prevent conflicts with other apps writing to local storage in development.
+ */
 const STORAGE_PREFIX = 'connect:'
 
+/**
+ * Storage key type. Used to catch typos in the key name.
+ */
 type StorageKey = 'lastSelectedDongleId'
 
 export default {