implement submission page

app/controllers/submissions_controller.rb

@@ -12,6 +12,8 @@ class SubmissionsController < ApplicationController
       Submission.joins(:template).where(template: { account_id: current_account.id })
                 .preload(template: { documents_attachments: { preview_images_attachments: :blob } })
                 .find(params[:id])
+
+    render :show, layout: 'plain'
   end
 
   def new; end

app/controllers/templates_controller.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class TemplatesController < ApplicationController
-  layout false
+  layout 'plain'
 
   before_action :load_base_template, only: %i[new create]