Two fixes on the graph view. Production area flows to the chart bottom now (the strip below y = 0 takes the same wash, no visible separator line at the production zero). J+1 / J+2 cards no longer paint the forecast as a production area: masked every hour past pastEndHour to null before building the production path, the area collapses to baseline on future days while the dotted forecast line keeps painting the modelled curve. Refs #28.