feat(mobile-web): add scroll-to-bottom button and dev mode#828
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A floating button appears when the user scrolls up from the message list. Tapping it smoothly scrolls back to the latest messages. Uses programmaticScrollRef guard and ref-based change detection to suppress button flicker during auto-scroll (new messages, streaming updates).
jarvis24young
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Summary
programmaticScrollRefguard suppresses the button during auto-scroll (new messages, streaming), with ref-based change detection to avoid unnecessary state updates.?devto the URL seeds mock data and bypasses pairing, enabling offline UI development without a desktop instance.focus-visibleoutline,prefers-reduced-motionsupport,forced-colorshigh-contrast mode,aria-hiddenon decorative SVG.Test plan
?devURL parameter bypasses pairing and loads mock data