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In this theme selection interface, tapping a color swatch triggers a fluid, full-screen color transition. The background of the device screen features a soft, ambient glow at the top that smoothly crossfades to match the selected theme's primary color. Simultaneously, the chat preview card in the center updates its bubble colors, and the theme name text updates to reflect the new selection. The selected swatch is highlighted with a clean white outer ring that fades and scales into place, providing clear visual feedback.
