chore: add update dialog

src/lib/global.ts

@@ -2,9 +2,13 @@ import { writable } from 'svelte/store';
 import { ezppfarm } from './api/ezpp';
 import type { Component } from 'svelte';
 import Loading from '../pages/Loading.svelte';
+import type { Release } from './types';
 
 export const currentView = writable<Component>(Loading);
 
+export const launcherVersion = writable<string>('');
+export const newVersion = writable<Release | undefined>(undefined);
+
 export const currentLoadingInfo = writable<string>('Initializing...');
 
 export const firstStartup = writable<boolean>(false);