Add a large amber alert-triangle icon to the 'keep your config backed up offline' banner and a close (x) button in its top-right. Dismissal is stored in localStorage (libreportal:backup-config-warning-dismissed) — a per-browser UI nudge, not server config — and hides both the banner and its divider until cleared.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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