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Add tabbed settings page with Profile, Appearance, Notifications, and Providers sections. Profile name/avatar save via BetterAuth updateUser. Appearance and notification preferences save to memory preferences API (ui.theme, ui.sidebar_collapsed, ui.default_model, notify.*). Settings load from API on tab activation with success/error feedback on save. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>