fix(ui): opaque session banner + header stacking context#404
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The session banner used undefined --bg-primary (resolved to transparent), so scrolled content bled through behind it and the header toolbar. - Replace var(--bg-primary) with var(--surface) on .session-banner - Add position:relative + z-index:20 to .chat-header so scroll content never renders above it - Remove top padding from .chat-messages so the sticky banner sits flush against the header with no transparent gap - Horizontal negative margin on the banner to span full scroll width Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Jun 27, 2026
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LGTM — no issues found.
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Summary
--bg-primaryCSS variable (resolved totransparent), causing scrolled content to bleed through.chat-messagescreated a transparent gap between header and sticky bannerChanges
var(--bg-primary)withvar(--surface)on.session-bannerposition: relative+z-index: 20to.chat-header.chat-messagesto bottom-only, so sticky banner sits flushTest plan
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