fix(frontend): confettiの実行がアニメーション設定を考慮していない問題を修正 (#16714)

* fix(frontend): confettiの実行がアニメーション設定を考慮していない問題を修正

* Update Changelog

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Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/frontend-shared/js/config.ts

@@ -20,3 +20,4 @@ export const instanceName = (siteName === 'Misskey' || siteName == null) ? host
 export const ui = localStorage.getItem('ui');
 export const debug = localStorage.getItem('debug') === 'true';
 export const isSafeMode = localStorage.getItem('isSafeMode') === 'true';
+export const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion)').matches;