Fix rubocop issues, introduce usage of frozen literal to improve performance

app/helpers/about_helper.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module AboutHelper
 end

app/helpers/accounts_helper.rb

@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 module AccountsHelper
   def pagination_options
     {
-      previous_label: "#{fa_icon('chevron-left')} Prev".html_safe,
-      next_label: "Next #{fa_icon('chevron-right')}".html_safe,
+      previous_label: safe_join([fa_icon('chevron-left'), 'Prev'], ' '),
+      next_label: safe_join(['Next', fa_icon('chevron-right')], ' '),
       inner_window: 1,
-      outer_window: 0
+      outer_window: 0,
     }
   end
 end

app/helpers/application_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ApplicationHelper
   def active_nav_class(path)
     current_page?(path) ? 'active' : ''

app/helpers/atom_builder_helper.rb

@@ -1,6 +1,12 @@
+# frozen_string_literal: true
+
 module AtomBuilderHelper
   def stream_updated_at
-    @account.stream_entries.last ? (@account.updated_at > @account.stream_entries.last.created_at ? @account.updated_at : @account.stream_entries.last.created_at) : @account.updated_at
+    if @account.stream_entries.last
+      (@account.updated_at > @account.stream_entries.last.created_at ? @account.updated_at : @account.stream_entries.last.created_at)
+    else
+      @account.updated_at
+    end
   end
 
   def entry(xml, is_root = false, &block)
@@ -98,7 +104,7 @@ module AtomBuilderHelper
   end
 
   def in_reply_to(xml, uri, url)
-    xml['thr'].send('in-reply-to', { ref: uri, href: url, type: 'text/html' })
+    xml['thr'].send('in-reply-to', ref: uri, href: url, type: 'text/html')
   end
 
   def link_mention(xml, account)

app/helpers/home_helper.rb

@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 module HomeHelper
   def default_props
     {
       token: @token,
-      account: render(file: 'api/v1/accounts/show', locals: { account: current_user.account }, formats: :json)
+      account: render(file: 'api/v1/accounts/show', locals: { account: current_user.account }, formats: :json),
     }
   end
 end

app/helpers/routing_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module RoutingHelper
   extend ActiveSupport::Concern
   include Rails.application.routes.url_helpers

app/helpers/stream_entries_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module StreamEntriesHelper
   def display_name(account)
     account.display_name.blank? ? account.username : account.display_name

app/helpers/tags_helper.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module TagsHelper
 end

app/helpers/xrd_helper.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 module XrdHelper
 end