Add performance diagnostics build

Ariver

2026-06-29 9d4f977026bbb4516f8cc97f715c0dc28bf2a13f

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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);