fix: treat right alt flags as key state

Ariver

2026-05-18 4ffa57abab0370b5bd8485a51bb333b369682aea

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import { writable } from "svelte/store";
 
export interface UpdateInfo {
  version: string;
  releaseNotes: string;
  downloadUrl: string;
}
 
export const updateAvailable = writable<UpdateInfo | null>(null);
export const updateDownloading = writable<boolean>(false);