feat: Add support for dark mode in dashboard (#7460)

- Add config for TailwindCSS
- Enable HMR
- Add a config in LocalStorage for Dark Mode

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>

app/javascript/dashboard/components/widgets/LoadingState.vue

@@ -1,6 +1,11 @@
 <template>
-  <div class="row loading-state">
-    <h6 class="message">{{ message }}<span class="spinner" /></h6>
+  <div class="flex items-center justify-center p-8">
+    <h6
+      class="block text-base text-center w-100 text-slate-800 dark:text-slate-300"
+    >
+      <span class="mr-3">{{ message }}</span>
+      <span class="spinner" />
+    </h6>
   </div>
 </template>
 <script>