await for completion when order enforced

app/controllers/submit_form_controller.rb

@@ -12,16 +12,20 @@ class SubmitFormController < ApplicationController
   def show
     @submitter = Submitter.find_by!(slug: params[:slug])
 
+    submission = @submitter.submission
+
     return redirect_to submit_form_completed_path(@submitter.slug) if @submitter.completed_at?
-    return render :archived if @submitter.submission.template.archived_at? || @submitter.submission.archived_at?
-    return render :expired if @submitter.submission.expired?
+    return render :archived if submission.template.archived_at? || submission.archived_at?
+    return render :expired if submission.expired?
     return render :declined if @submitter.declined_at?
+    return render :awaiting if submission.template.preferences['submitters_order'] == 'preserved' &&
+                               !Submitters.current_submitter_order?(@submitter)
 
     Submitters.preload_with_pages(@submitter)
 
     Submitters::MaybeUpdateDefaultValues.call(@submitter, current_user)
 
-    @attachments_index = ActiveStorage::Attachment.where(record: @submitter.submission.submitters, name: :attachments)
+    @attachments_index = ActiveStorage::Attachment.where(record: submission.submitters, name: :attachments)
                                                   .preload(:blob).index_by(&:uuid)
 
     @form_configs = Submitters::FormConfigs.call(@submitter, CONFIG_KEYS)

app/views/submit_form/awaiting.html.erb

@@ -0,0 +1,21 @@
+<div class="max-w-md mx-auto px-2 mt-12 mb-4">
+  <div class="space-y-6 mx-auto">
+    <div class="space-y-6">
+      <div class="flex items-center justify-center">
+        <%= render 'start_form/banner' %>
+      </div>
+      <div class="flex items-center bg-base-200 rounded-xl p-4 mb-4">
+        <div class="flex items-center">
+          <div class="mr-3">
+            <%= svg_icon('writing_sign', class: 'w-10 h-10') %>
+          </div>
+          <div dir="auto">
+            <p class="text-lg font-bold mb-1"><%= @submitter.submission.template.name %></p>
+            <p class="text-sm"><%= t('awaiting_completion_by_the_other_party') %></p>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+<%= render 'shared/attribution', link_path: '/start', account: @submitter.account %>