[untitled] Phone Number Sign in Interaction

Upon tapping the 'Sign in with phone number' button, the app executes a smooth shared-element transition. The large, vibrant 3D CD illustration at the center of the onboarding screen scales down, shifts its internal liquid-pink texture to a metallic silver sheen, and glides upward to become a smaller header icon. Simultaneously, the main onboarding text and buttons fade out, while the phone number input form, 'Next' button, and numeric keyboard slide up from the bottom with a subtle spring ease, creating a highly cohesive and premium flow.