Slack Summarize Pill Pop Avatar Unread Count Morph Interaction

This interaction demonstrates a dynamic pill button used for AI thread summarization. The button smoothly transitions between two states: a wide pill reading 'Summarize 40 Unreads' and a condensed pill reading 'Summarize' alongside two overlapping user avatars. During the transition, the pill's width shrinks with a springy ease, the unread count text fades out, and the circular avatars scale and slide into place from the right. The fluid morphing effect maintains visual continuity while shifting from a quantitative metric to a personal, face-based representation of the unread messages.