Change public accounts pages to mount the web UI (#19319)

* Change public accounts pages to mount the web UI

* Fix handling of remote usernames in routes

- When logged in, serve web app
- When logged out, redirect to permalink
- Fix `app-body` class not being set sometimes due to name conflict

* Fix missing `multiColumn` prop

* Fix failing test

* Use `discoverable` attribute to control indexing directives

* Fix `<ColumnLoading />` not using `multiColumn`

* Add `noindex` to accounts in REST API

* Change noindex directive to not be rendered by default before a route is mounted

* Add loading indicator for detailed status in web UI

* Fix missing indicator appearing while account is loading in web UI

spec/lib/permalink_redirector_spec.rb

@@ -3,40 +3,31 @@
 require 'rails_helper'
 
 describe PermalinkRedirector do
+  let(:remote_account) { Fabricate(:account, username: 'alice', domain: 'example.com', url: 'https://example.com/@alice', id: 2) }
+
   describe '#redirect_url' do
     before do
-      account = Fabricate(:account, username: 'alice', id: 1)
-      Fabricate(:status, account: account, id: 123)
+      Fabricate(:status, account: remote_account, id: 123, url: 'https://example.com/status-123')
     end
 
     it 'returns path for legacy account links' do
-      redirector = described_class.new('web/accounts/1')
-      expect(redirector.redirect_path).to eq 'https://cb6e6126.ngrok.io/@alice'
+      redirector = described_class.new('accounts/2')
+      expect(redirector.redirect_path).to eq 'https://example.com/@alice'
     end
 
     it 'returns path for legacy status links' do
-      redirector = described_class.new('web/statuses/123')
-      expect(redirector.redirect_path).to eq 'https://cb6e6126.ngrok.io/@alice/123'
-    end
-
-    it 'returns path for legacy tag links' do
-      redirector = described_class.new('web/timelines/tag/hoge')
-      expect(redirector.redirect_path).to be_nil
+      redirector = described_class.new('statuses/123')
+      expect(redirector.redirect_path).to eq 'https://example.com/status-123'
     end
 
     it 'returns path for pretty account links' do
-      redirector = described_class.new('web/@alice')
-      expect(redirector.redirect_path).to eq 'https://cb6e6126.ngrok.io/@alice'
+      redirector = described_class.new('@alice@example.com')
+      expect(redirector.redirect_path).to eq 'https://example.com/@alice'
     end
 
     it 'returns path for pretty status links' do
-      redirector = described_class.new('web/@alice/123')
-      expect(redirector.redirect_path).to eq 'https://cb6e6126.ngrok.io/@alice/123'
-    end
-
-    it 'returns path for pretty tag links' do
-      redirector = described_class.new('web/tags/hoge')
-      expect(redirector.redirect_path).to be_nil
+      redirector = described_class.new('@alice/123')
+      expect(redirector.redirect_path).to eq 'https://example.com/status-123'
     end
   end
 end