Extension: let the operator add manual event annotations to charts (watering, defoliation, feed change) – the charts already draw lights-off / stage-change / al

WHAT: The history charts already overlay event markers – ‘lights off’, ‘stage change’, ‘alert’, ‘no shot ticks’. There is no way for an operator to add their OWN event markers. WHY: growers correlate sensor movements with actions (watered, defoliated, changed feed, opened the tent); being able to drop a marker – or have journal notes auto-appear as markers – turns the charts into a real grow diary overlay. HOW: render plant/tent journal entries (which already exist and are timestamped) as optional markers on the matching charts, and add a quick ‘mark event now’ affordance. Extends the existing marker layer + journals. Found live 8.2.0.