Update sidebar unit grouping and apply layout/page updates

hdyc-svelte/src/routes/[slug]/+page.svelte

@@ -1,8 +1,5 @@
 <script lang="ts">
   import Calculator from '$lib/components/Calculator.svelte';
-  import { afterNavigate } from '$app/navigation';
-  import { browser } from '$app/environment';
-  import { onMount } from 'svelte';
   import type { PageData } from './$types';
   import { buildSeoMeta, canonicalUrl, SITE_NAME, SITE_URL, toJsonLd } from '$lib/seo';
 
@@ -56,15 +53,6 @@
     },
   });
 
-  afterNavigate(() => {
-    if (!browser) return;
-    window.scrollTo({ top: 0 });
-  });
-
-  onMount(() => {
-    if (!browser) return;
-    window.scrollTo({ top: 0 });
-  });
 </script>
 
 <svelte:head>