Per-vehicle 'I've seen this' control on the Fuel dashboard. Stamps
attention_dismissed_at on the vehicles collection; auto-undismisses when
a flagged fuel log with date_logged > dismissal arrives. Timestamp only,
no reason field. Tiny POST/DELETE route + filter line in page mapper +
Dismiss button on alert rows + Dismissed/Restore pill on vehicle detail.
Co-Authored-By: Claude <noreply@anthropic.com>
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