cancel subscriptions on signup popup destroy

src/app/website/signup/RegisteredPopup.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import { registeredPopupState } from '@app/website/signup/RegisteredPopup.ts';
   import Input from '@components/input/Input.svelte';
+  import { onDestroy } from 'svelte';
 
   interface Props {
     discordLink: string;
@@ -15,7 +16,7 @@
 
   let modal: HTMLDialogElement;
 
-  registeredPopupState.subscribe(async (value) => {
+  const cancel = registeredPopupState.subscribe(async (value) => {
     if (!value) return;
 
     modal.show();
@@ -40,6 +41,8 @@
 
     skinViewer.dispose();
   });
+
+  onDestroy(cancel);
 </script>
 
 <dialog class="modal" bind:this={modal} onclose={() => ($registeredPopupState = null)}>

src/app/website/signup/RulesPopup.svelte

@@ -2,6 +2,7 @@
   import { rulesPopupState, rulesPopupRead } from './RulesPopup.ts';
   import { rules } from '../../../rules.ts';
   import { popupState } from '@components/popup/Popup.ts';
+  import { onDestroy } from 'svelte';
 
   const modalTimeoutSeconds = 30;
 
@@ -10,7 +11,7 @@
   let modalTimer = $state<ReturnType<typeof setInterval> | null>(null);
   let modalSecondsOpen = $state(import.meta.env.PROD ? 0 : modalTimeoutSeconds);
 
-  rulesPopupState.listen((value) => {
+  const cancel = rulesPopupState.subscribe((value) => {
     if (value == 'open') {
       modalElem.show();
       modalTimer = setInterval(() => modalSecondsOpen++, 1000);
@@ -18,10 +19,11 @@
       clearInterval(modalTimer!);
     }
   });
+
+  onDestroy(cancel);
 </script>
 
 <dialog
-  id="rules-popup"
   class="modal"
   onclose={() => {
     if ($rulesPopupState !== 'accepted') $rulesPopupState = 'closed';

src/app/website/signup/TeamPopup.svelte

@@ -1,14 +1,17 @@
 <script lang="ts">
   import { teamPopupOpen, teamPopupName } from '@app/website/signup/TeamPopup.ts';
   import Input from '@components/input/Input.svelte';
+  import { onDestroy } from 'svelte';
 
   let modal: HTMLDialogElement;
   let form: HTMLFormElement;
 
-  teamPopupOpen.subscribe((value) => {
+  const cancel = teamPopupOpen.subscribe((value) => {
     if (value) modal.show();
     else form?.reset();
   });
+
+  onDestroy(cancel);
 </script>
 
 <dialog class="modal" bind:this={modal} onclose={() => ($teamPopupOpen = false)}>