Adds SettingsPage, a list of setting items (header, bool, int/string
choice, int slider, info, hint, or a custom view) that keeps its texts as
translation keys. CreateSettingViews() turns a page into the same widgets as
before. Since a page can be built without creating any views, search can
later work from it directly, in English as well as translated.
Slider defaults come from the config's own defaults unless given. The Audio
tab is the first one converted, and looks the same as before.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
