A device already on a canvas (Node exists) but with no pending_devices row
never showed in the discovery inventory — the inventory lists pending_devices,
not nodes. This stranded legacy auto-placed coordinators: on a canvas yet
invisible in the inventory list.
Both mesh imports now, in the already-approved-node branch, ensure an
inventory row exists: create one as status="approved" when missing, or
refresh its metadata (preserving status) when present. New/unplaced devices
still land as status="pending"; hidden rows stay hidden.
Tests updated: approved-node path now backfills an approved inventory row
(zigbee + zwave), plus a regression that a hidden inventory row is not
revived.
ha-relevant: yes