Add: #769 投稿のフォントサイズ調整機能 (#810)

app/models/concerns/user/has_settings.rb

@@ -103,6 +103,10 @@ module User::HasSettings
     settings['web.use_system_font']
   end
 
+  def setting_content_font_size
+    settings['web.content_font_size']
+  end
+
   def setting_show_quote_in_home
     settings['web.show_quote_in_home']
   end

app/models/user_settings.rb

@@ -55,6 +55,7 @@ class UserSettings
     setting :use_blurhash, default: true
     setting :use_pending_items, default: false
     setting :use_system_font, default: false
+    setting :content_font_size, default: 'medium', in: %w(medium large x_large xx_large)
     setting :bookmark_category_needed, default: false
     setting :disable_swiping, default: false
     setting :disable_hover_cards, default: false