Change public statuses pages to mount the web UI (#19301)

app/controllers/statuses_controller.rb

@@ -5,17 +5,15 @@ class StatusesController < ApplicationController
   include SignatureAuthentication
   include Authorization
   include AccountOwnedConcern
-
-  layout 'public'
+  include WebAppControllerConcern
 
   before_action :require_account_signature!, only: [:show, :activity], if: -> { request.format == :json && authorized_fetch_mode? }
   before_action :set_status
   before_action :set_instance_presenter
   before_action :set_link_headers
   before_action :redirect_to_original, only: :show
-  before_action :set_referrer_policy_header, only: :show
   before_action :set_cache_headers
-  before_action :set_body_classes
+  before_action :set_body_classes, only: :embed
 
   skip_around_action :set_locale, if: -> { request.format == :json }
   skip_before_action :require_functional!, only: [:show, :embed], unless: :whitelist_mode?
@@ -28,8 +26,6 @@ class StatusesController < ApplicationController
     respond_to do |format|
       format.html do
         expires_in 10.seconds, public: true if current_account.nil?
-        set_ancestors
-        set_descendants
       end
 
       format.json do
@@ -77,8 +73,4 @@ class StatusesController < ApplicationController
   def redirect_to_original
     redirect_to ActivityPub::TagManager.instance.url_for(@status.reblog) if @status.reblog?
   end
-
-  def set_referrer_policy_header
-    response.headers['Referrer-Policy'] = 'origin' unless @status.distributable?
-  end
 end