feat: update colors for v4 (#10660)

Porting changes from https://github.com/chatwoot/chatwoot/pull/10552

---------

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: Vishnu Narayanan <vishnu@chatwoot.com>
Co-authored-by: Sojan <sojan@pepalo.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/components/widgets/conversation/ConversationBox.vue

@@ -125,10 +125,7 @@ export default {
         :show-badge="false"
       />
     </woot-tabs>
-    <div
-      v-show="!activeIndex"
-      class="flex h-full min-h-0 m-0 bg-slate-25 dark:bg-slate-800"
-    >
+    <div v-show="!activeIndex" class="flex h-full min-h-0 m-0">
       <MessagesView
         v-if="currentChat.id"
         :inbox-id="inboxId"