Cosmos Theme Switcher Interaction

This interaction showcases a theme switcher during onboarding. Tapping between 'Light', 'System', and 'Dark' options triggers a fluid transition. The entire screen background crossfades between light and dark, while a central preview card morphs its internal mock UI colors to match. The segmented control at the bottom uses a sliding pill selector with a subtle spring bounce to indicate the active state, providing instant, delightful visual feedback.