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

src/lib/components/layout/Sidebar.svelte

@@ -676,7 +676,8 @@
 									<div class="self-center shrink-0">
 										<img
 											crossorigin="anonymous"
-											src={model?.info?.meta?.profile_image_url ?? '/static/favicon.png'}
+											src={model?.info?.meta?.profile_image_url ??
+												`${WEBUI_BASE_URL}/static/favicon.png`}
 											class=" size-5 rounded-full -translate-x-[0.5px]"
 											alt="logo"
 										/>