Umbau Ganztagsbereich (#292)

- [x] Umbau von Bereich zu Hauptseite mit Kacheln
- [x] Aktualisierung für SJ 2025/2026
- [x] Aktualisierung in CMS-Konfiguration inkl. Vorschau

Reviewed-on: #292

layouts/partials/filter-controls.html

@@ -1,8 +1,18 @@
 <ul class="list-inline text-center filter-controls mb-4">
-  <li class="list-inline-item m-3 text-uppercase active" data-filter="all">Alle</li>
   {{ $categories := slice }}
-  {{ range .Data.Pages }}
-    {{ $categories = $categories | append .Params.category }}
+  {{ if ne (len .Data.Pages) 0 }}
+    {{ range .Data.Pages }}
+      {{ $categories = $categories | append .Params.category }}
+    {{ end }}
+  {{ else }}
+    {{ range .Params.tiles }}
+      {{ with .category }}
+        {{ $categories = $categories | append . }}
+      {{ end }}
+    {{ end }}
+  {{ end }}
+  {{ if ne (len $categories) 0 }}
+    <li class="list-inline-item m-3 text-uppercase active" data-filter="all">Alle</li>
   {{ end }}
   {{ range ( $categories | uniq ) }}
     <li class="list-inline-item m-3 text-uppercase" data-filter="{{ . | urlize }}">{{ . | humanize }}</li>