fix: Reset sidebar to show expanded list when refreshing the page (#13229)

Previously, the sidebar remembered which section was expanded using
session storage. This caused a confusing experience where the sidebar
would collapse on page refresh.

With this update, the session storage dependency is removed, and the
sidebar would expand based on the current active page, which gives a
cleaner UX.

app/javascript/dashboard/components-next/sidebar/SidebarGroup.vue

@@ -1,5 +1,5 @@
 <script setup>
-import { computed, onMounted, nextTick } from 'vue';
+import { computed, onMounted, watch, nextTick } from 'vue';
 import { useSidebarContext } from './provider';
 import { useRoute, useRouter } from 'vue-router';
 import Policy from 'dashboard/components/policy.vue';
@@ -126,6 +126,16 @@ onMounted(async () => {
     setExpandedItem(props.name);
   }
 });
+
+watch(
+  hasActiveChild,
+  hasNewActiveChild => {
+    if (hasNewActiveChild && !isExpanded.value) {
+      setExpandedItem(props.name);
+    }
+  },
+  { once: true }
+);
 </script>
 
 <!-- eslint-disable-next-line vue/no-root-v-if -->