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When the user taps the call button, the interface transitions into a vibrant green, full-screen calling state. The caller's purple avatar sits in the center, surrounded by a soft, repeating radial pulse that signals an active outgoing call. Once connected, the purple avatar smoothly slides upward to make room, while the recipient's yellow avatar slides up from the bottom with a springy bounce. Simultaneously, the call control buttons (speaker, mute, disconnect) fade and slide into place at the bottom of the screen, completing the transition into an active call session.
