Initial commit: Add logistics and order_detail message types

- Add Logistics component with progress tracking
- Add OrderDetail component for order information
- Support data-driven steps and actions
- Add blue color scale to widget SCSS
- Fix node overflow and progress bar rendering issues
- Add English translations for dashboard components

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/controllers/api/v1/accounts/actions/contact_merges_controller.rb

@@ -0,0 +1,27 @@
+class Api::V1::Accounts::Actions::ContactMergesController < Api::V1::Accounts::BaseController
+  before_action :set_base_contact, only: [:create]
+  before_action :set_mergee_contact, only: [:create]
+
+  def create
+    contact_merge_action = ContactMergeAction.new(
+      account: Current.account,
+      base_contact: @base_contact,
+      mergee_contact: @mergee_contact
+    )
+    contact_merge_action.perform
+  end
+
+  private
+
+  def set_base_contact
+    @base_contact = contacts.find(params[:base_contact_id])
+  end
+
+  def set_mergee_contact
+    @mergee_contact = contacts.find(params[:mergee_contact_id])
+  end
+
+  def contacts
+    @contacts ||= Current.account.contacts
+  end
+end