feat: Improve Captain interactions, activity messages (#11493)

Show captain messages under the name of the assistant which generated
the message.

- Add support for `Captain::Assistant` sender type
- Add push_event_data for captain_assistants
- Add activity message handler for captain_assistants
- Update UI to show captain messages under the name of the assistant
- Fix the issue where openAI errors when image is sent
- Add support for custom name of the assistant

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

enterprise/app/jobs/captain/conversation/response_builder_job.rb

@@ -6,11 +6,15 @@ class Captain::Conversation::ResponseBuilderJob < ApplicationJob
     @inbox = conversation.inbox
     @assistant = assistant
 
+    Current.executed_by = @assistant
+
     ActiveRecord::Base.transaction do
       generate_and_process_response
     end
   rescue StandardError => e
     handle_error(e)
+  ensure
+    Current.executed_by = nil
   end
 
   private
@@ -37,13 +41,23 @@ class Captain::Conversation::ResponseBuilderJob < ApplicationJob
       .where(private: false)
       .map do |message|
         {
-          content: message.content,
+          content: message_content(message),
           role: determine_role(message)
         }
       end
   end
 
+  def message_content(message)
+    return message.content if message.content.present?
+
+    'User has shared an attachment' if message.attachments.any?
+
+    'User has shared a message without content'
+  end
+
   def determine_role(message)
+    return 'system' if message.content.blank?
+
     message.message_type == 'incoming' ? 'user' : 'system'
   end
 
@@ -54,13 +68,15 @@ class Captain::Conversation::ResponseBuilderJob < ApplicationJob
   def process_action(action)
     case action
     when 'handoff'
-      create_handoff_message
-      @conversation.bot_handoff!
+      I18n.with_locale(@assistant.account.locale) do
+        create_handoff_message
+        @conversation.bot_handoff!
+      end
     end
   end
 
   def create_handoff_message
-    create_outgoing_message(@assistant.config['handoff_message'] || 'Transferring to another agent for further assistance.')
+    create_outgoing_message(@assistant.config['handoff_message'].presence || I18n.t('conversations.captain.handoff'))
   end
 
   def create_messages
@@ -77,6 +93,7 @@ class Captain::Conversation::ResponseBuilderJob < ApplicationJob
       message_type: :outgoing,
       account_id: account.id,
       inbox_id: inbox.id,
+      sender: @assistant,
       content: message_content
     )
   end