chore: streamline the URL used for resources like favicon.png

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

@@ -6,6 +6,7 @@
 	import { models, settings } from '$lib/stores';
 	import { user as _user } from '$lib/stores';
 	import { copyToClipboard as _copyToClipboard, formatDate } from '$lib/utils';
+	import { WEBUI_BASE_URL } from '$lib/constants';
 
 	import Name from './Name.svelte';
 	import ProfileImage from './ProfileImage.svelte';
@@ -117,8 +118,8 @@
 			<ProfileImage
 				src={message.user
 					? ($models.find((m) => m.id === message.user)?.info?.meta?.profile_image_url ??
-						'/user.png')
-					: (user?.profile_image_url ?? '/user.png')}
+						`${WEBUI_BASE_URL}/user.png`)
+					: (user?.profile_image_url ?? `${WEBUI_BASE_URL}/user.png`)}
 				className={'size-8 user-message-profile-image'}
 			/>
 		</div>