- New Language row in the main Settings list with current-language summary - New SettingsLanguage drill-down page with an OutlinedButton + DropdownMenu picker (scales to any number of languages; same pattern as theme presets) - Shared supportedLanguages()/languageLabel() helpers — adding a language is now one entry in one place - Removed the 4-option segmented pill row from the Appearance page - Added settings_sec_language string (en + zh) Co-authored-by: M57 <hy4ri@users.noreply.github.com>