The error banner is a flex child of the chat panel column. Mantine's
Alert root is `overflow: hidden`, which (per the CSS flexbox spec) drops
its automatic min-height to 0, so when the message history fills the
panel the flexbox compressed the banner below its content height and the
overflow:hidden clipped the detail text (e.g. "Please try again.").
Set flex-shrink: 0 on the banner so it always shows its full content; the
scrollable message list absorbs the height pressure instead.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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