Slack Pinch to Summarize Interaction

The interaction begins when a user performs a pinch-in gesture on an unread chat thread within the Catch Up interface. This gesture triggers a full-screen blur effect on the underlying messages, bringing a central loading state into focus with a spinning AI icon and a 'Summarizing' status. Once processed, the summary points slide and fade in from the bottom, organized into clean, expandable cards. Tapping 'Mark as Read' triggers a scale-up checkmark overlay before transitioning to the next unread channel, culminating in a playful 'All clear' success state.