feat: Add new sidebar for Chatwoot V4 (#10291)

This PR has the initial version of the new sidebar targeted for the next major redesign of the app. This PR includes the following changes

- Components in the `layouts-next` and `base-next` directories in `dashboard/components`
- Two generic components `Avatar` and `Icon`
- `SidebarGroup` component to manage expandable sidebar groups with nested navigation items. This includes handling active states, transitions, and permissions.
- `SidebarGroupHeader` component to display the header of each navigation group with optional icons and active state indication.
- `SidebarGroupLeaf` component for individual navigation items within a group, supporting icons and active state.
- `SidebarGroupSeparator` component to visually separate nested navigation items. (They look a lot like header)
- `SidebarGroupEmptyLeaf` component to render empty state of any navigation groups.

----

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/components/policy.vue

@@ -1,32 +1,31 @@
 <script setup>
-import { useStoreGetters } from 'dashboard/composables/store';
+import { usePolicy } from 'dashboard/composables/usePolicy';
 import { computed } from 'vue';
-import {
-  getUserPermissions,
-  hasPermissions,
-} from '../helper/permissionsHelper';
 
 const props = defineProps({
+  as: {
+    type: String,
+    default: 'div',
+  },
   permissions: {
     type: Array,
     required: true,
   },
+  featureFlag: {
+    type: String,
+    default: null,
+  },
 });
 
-const getters = useStoreGetters();
-const user = computed(() => getters.getCurrentUser.value);
-const accountId = computed(() => getters.getCurrentAccountId.value);
-const userPermissions = computed(() => {
-  return getUserPermissions(user.value, accountId.value);
-});
-const hasPermission = computed(() => {
-  return hasPermissions(props.permissions, userPermissions.value);
-});
+const { checkFeatureAllowed, checkPermissions } = usePolicy();
+
+const isFeatureAllowed = computed(() => checkFeatureAllowed(props.featureFlag));
+const hasPermission = computed(() => checkPermissions(props.permissions));
 </script>
 
 <!-- eslint-disable vue/no-root-v-if -->
 <template>
-  <div v-if="hasPermission">
+  <component :is="as" v-if="isFeatureAllowed && hasPermission">
     <slot />
-  </div>
+  </component>
 </template>