new tabs above the approvals list: 'pending · N' and
'history · M'. active tab persists in localStorage so the
operator can park on history if they prefer. on a fresh
dashboard the default is pending (matches the prior shape).
history view shows the last 30 resolved approvals — newest
first by resolved_at — with one row per approval: status
glyph (✓ approved / ✗ denied / ⚠ failed), id, agent, kind,
short sha, status label, and a relative time chip. when the
row has a note (deny reason or build error), it renders
below in a muted block with line wraps preserved.
backend: Approvals::recent_resolved(limit) queries by
status IN ('approved', 'denied', 'failed') ORDER BY
resolved_at DESC. StateSnapshot gets approval_history (a
lean ApprovalHistoryView without diff_html — rendering 30
git diffs per state poll would be expensive and the operator
already saw the diff at decision time). dashboard's
history_view fn projects the sqlite row.
retires the matching TODO entry.
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