The profit line already drawn on Income vs Fixed vs Running, isolated into its
own full-width card above the monthly trend, with the marker the eye actually
wants: a green dot on a month that made money, a red dot on one that did not.
A line rather than bars, so it is the same series the card above draws and the
two cannot drift.
The dots are NOT on the run lines. A run of a single month has no segment, so a
lone profitable month would have had no dot at all and vanished from the chart.
A second, transparent Line carries `profit` and draws one marker per month
coloured from that month's own sign.
September is a HOLLOW dot, which is the honest part: monthly_running_costs has
rows for Jan-Aug only, so September's profit has had no running cost subtracted
and is optimistic. /charts already marks such a month the same way. The chart
also says so in words, and the KPI is unaffected.
The tooltip shows the hovered MONTH's profit, not a running total, and names it
Profit or Loss by sign rather than surfacing the profitRun0/profitCross0 keys.
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