FEATURE: One-click chat reaction settings (#32150)

Adds a one-click chat reactions setting to the chat preferences page
where members can determine what one-click reactions are shown in chat.

- Frequent: This will be the default setting. (Automatically set based
on most used chat reactions)
- Custom: Members can choose up to three reactions they want to see in
their one-click chat/DM reactions menu. Defaults are `❤️`, `👍` ,
and `😄`.


![image](https://github.com/user-attachments/assets/8913db0e-d6ec-4347-ad91-2329206b127c)

This pull request is essentially the work of @dsims in
https://github.com/discourse/discourse/pull/31761

---------

Co-authored-by: dsims <1041068+dsims@users.noreply.github.com>

plugins/chat/plugin.rb

@@ -54,6 +54,8 @@ after_initialize do
   DiscoursePluginRegistry.register_flag_applies_to_type("Chat::Message", self)
 
   UserUpdater::OPTION_ATTR.push(:chat_enabled)
+  UserUpdater::OPTION_ATTR.push(:chat_quick_reaction_type)
+  UserUpdater::OPTION_ATTR.push(:chat_quick_reactions_custom)
   UserUpdater::OPTION_ATTR.push(:only_chat_push_notifications)
   UserUpdater::OPTION_ATTR.push(:chat_sound)
   UserUpdater::OPTION_ATTR.push(:ignore_channel_wide_mention)
@@ -251,6 +253,18 @@ after_initialize do
 
   add_to_serializer(:current_user_option, :chat_send_shortcut) { object.chat_send_shortcut }
 
+  add_to_serializer(:user_option, :chat_quick_reaction_type) { object.chat_quick_reaction_type }
+  add_to_serializer(:current_user_option, :chat_quick_reaction_type) do
+    object.chat_quick_reaction_type
+  end
+
+  add_to_serializer(:user_option, :chat_quick_reactions_custom) do
+    object.chat_quick_reactions_custom
+  end
+  add_to_serializer(:current_user_option, :chat_quick_reactions_custom) do
+    object.chat_quick_reactions_custom
+  end
+
   on(:site_setting_changed) do |name, old_value, new_value|
     user_option_field = Chat::RETENTION_SETTINGS_TO_USER_OPTION_FIELDS[name.to_sym]
     begin