Add libauth.ts for centralised authentication

src/routes/more/reg/+page.svelte

@@ -4,6 +4,7 @@
   import Loading from '$lib/navigation/loading.svelte';
   import { onMount } from 'svelte';
   import { uuid } from '$lib/stores/uuid.js';
+  import { checkAuth } from '$lib/libauth';
 
   const title = 'Register';
 
@@ -38,17 +39,14 @@
     isLoading = false;
   }
 
-  $: {
-    if ($uuid != 'null') {
-      state = 'reg'
-    } else state = 'unreg'
-  }
-
- /* onMount(async () => {
-    if ($uuid != 'null') {
+  onMount(async () => {
+    const auth = await checkAuth();
+    if (auth.uuidPresent === false) {
+      state =  'unreg';
+    } else if (auth.uuidPresent === true) {
       state = 'reg';
     }
-  });*/
+  });
 </script>
 
 {#if isLoading}