chore: Assign the conversation to agent who opens the conversation (#3925)

app/controllers/api/v1/accounts/conversations_controller.rb

@@ -61,6 +61,7 @@ class Api::V1::Accounts::ConversationsController < Api::V1::Accounts::BaseContro
     else
       @status = @conversation.toggle_status
     end
+    assign_conversation if @conversation.status == 'open' && Current.user.is_a?(User) && Current.user&.agent?
   end
 
   def toggle_typing_status
@@ -93,6 +94,11 @@ class Api::V1::Accounts::ConversationsController < Api::V1::Accounts::BaseContro
     @conversation.snoozed_until = parse_date_time(params[:snoozed_until].to_s) if params[:snoozed_until]
   end
 
+  def assign_conversation
+    @agent = Current.account.users.find(current_user.id)
+    @conversation.update_assignee(@agent)
+  end
+
   def trigger_typing_event(event, is_private)
     user = current_user.presence || @resource
     Rails.configuration.dispatcher.dispatch(event, Time.zone.now, conversation: @conversation, user: user, is_private: is_private)