refactor: Introduce specific ElementCall error type with code

src/room/InCallView.tsx

@@ -97,13 +97,12 @@ import {
   useSetting,
 } from "../settings/settings";
 import { ReactionsReader } from "../reactions/ReactionsReader";
+import { ConnectionLostError } from "../utils/ec-errors.ts";
 
 const canScreenshare = "getDisplayMedia" in (navigator.mediaDevices ?? {});
 
 const maxTapDurationMs = 400;
 
-export class ConnectionLostError extends Error {}
-
 export interface ActiveCallProps
   extends Omit<InCallViewProps, "vm" | "livekitRoom" | "connState"> {
   e2eeSystem: EncryptionSystem;