Adds unread message bubbles for widget (#943)

Co-authored-by: Sojan <sojan@pepalo.com>
Co-authored-by: Pranav Raj S <pranav@thoughtwoot.com>

app/javascript/widget/store/modules/conversationAttributes.js

@@ -17,7 +17,9 @@ export const actions = {
   get: async ({ commit }) => {
     try {
       const { data } = await getConversationAPI();
+      const { user_last_seen_at: lastSeen } = data;
       commit(SET_CONVERSATION_ATTRIBUTES, data);
+      commit('conversation/setMetaUserLastSeenAt', lastSeen, { root: true });
     } catch (error) {
       // Ignore error
     }