perf(frontend): import snowfall-effect dynamically to reduce bundle size

packages/frontend/src/boot/main-boot.ts

@@ -20,7 +20,6 @@ import { mainRouter } from '@/router.js';
 import { initializeSw } from '@/scripts/initialize-sw.js';
 import { deckStore } from '@/ui/deck/deck-store.js';
 import { emojiPicker } from '@/scripts/emoji-picker.js';
-import { SnowfallEffect } from '@/scripts/snowfall-effect.js';
 
 export async function mainBoot() {
 	const { isClientUpdated } = await common(() => createApp(
@@ -79,6 +78,7 @@ export async function mainBoot() {
 	if (defaultStore.state.enableSeasonalScreenEffect) {
 		const month = new Date().getMonth() + 1;
 		if (month === 12 || month === 1) {
+			const SnowfallEffect = (await import('@/scripts/snowfall-effect.js')).SnowfallEffect;
 			new SnowfallEffect().render();
 		}
 	}