webui: Static build output improvements (#21667)

* refactor: Build improvements

* chore: Formatting + package lock update

tools/server/public/index.html

@@ -1,5 +1,5 @@
 <!--
-  This is a single file build of the frontend.
+  This is a static build of the frontend.
   It is automatically generated by the build process.
   Do not edit this file directly.
   To make changes, refer to the "Web UI" section in the README.
@@ -18,7 +18,7 @@
 		<div style="display: contents">
 			<script>
 				{
-					__sveltekit_1ao0o9h = {
+					__sveltekit__ = {
 						base: new URL('.', location).pathname.slice(0, -1)
 					};