fix state pollution and other bugs, and random other stuff

src/stores/roomStore.ts

@@ -1,13 +1,16 @@
 import { writable, type Writable } from 'svelte/store';
 import { ConnectionState } from '../types/websocket';
+import { browser } from '$app/environment';
 
 export interface Room {
     id: string | null;
+    participants: number;
     connectionState: ConnectionState;
 }
 
 export const room: Writable<Room> = writable({
     id: null,
+    participants: 0,
     connectionState: ConnectionState.DISCONNECTED,
     key: null,
 });