Chat UI: distinct background band for user messages - #225
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In dark mode user and assistant messages render on near-identical backgrounds. Give user messages their own background band so the two roles read as distinct when scrolling. - UserMessage.tsx: add `msg-user` class + `data-role="user"` (mirrors AssistantMessage). - index.css: `.msg-user` -> `--theme-surface-hover` in dark; light mode stays transparent (user messages already sit on the page bg; assistant band stays white). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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In dark mode, user and assistant messages render on near-identical backgrounds. This gives user messages their own background band so the two roles read as distinct when scrolling.
Changes
UserMessage.tsx: addmsg-userclass +data-role="user"(mirrors the existingAssistantMessagepattern).index.css:.msg-user→--theme-surface-hoverin dark; light mode stays transparent — user messages already sit on the page bg, and the assistant band stays white.CSS + one className; no behavior change.