perf: replace JSON.stringify equality with fast-deep-equal (#23370)

src/lib/components/chat/Messages/UserMessage.svelte

@@ -7,6 +7,7 @@
 	import { user as _user } from '$lib/stores';
 	import { copyToClipboard as _copyToClipboard, formatDate } from '$lib/utils';
 	import { WEBUI_API_BASE_URL, WEBUI_BASE_URL } from '$lib/constants';
+	import equal from 'fast-deep-equal';
 
 	import Name from './Name.svelte';
 	import ProfileImage from './ProfileImage.svelte';
@@ -58,7 +59,7 @@
 		if (source) {
 			if (message.content !== source.content) {
 				message = structuredClone(source);
-			} else if (JSON.stringify(message) !== JSON.stringify(source)) {
+			} else if (!equal(message, source)) {
 				message = structuredClone(source);
 			}
 		}