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When the user drags the red video shutter button to the right towards the lock icon, the button stretches horizontally with an elastic, liquid-like morph. Once it passes the threshold, it snaps into a square recording stop button inside a white ring, while a secondary white shutter button for taking photos during video capture scales and fades in from the right. Tapping the stop button smoothly collapses the UI back to its original circular state.
