perf(site/src): reduce mobile chat sticky work#25612
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Long mobile agent chats can hit Mobile Safari resource limits because every user message mounts sticky-message sentinel and observer machinery.
Render user messages without sticky pinning on mobile viewports while keeping desktop sticky behavior, and add a Storybook regression that verifies long mobile chats do not render sticky sentinels.
Refs CODAGT-450
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Generated by Coder Agents.
Investigation pointed to mobile sticky user messages as the lowest-risk hotspot: each user message mounted sentinel, observer, listener, and overlay DOM. This PR keeps that work on non-mobile viewports instead of introducing transcript virtualization, which is higher risk with inverse infinite scroll and dynamic tool output.