Panel 11 stacks RSU-attributed income tax on top of cash PAYE, which
is mathematically correct but emotionally misleading since RSU tax is
withheld at source via sell-to-cover and never hits the bank. Adopts
the two-view convention: Panel 11 keeps the full PAYE picture; new
Panel 13 shows cash-only deductions. Dashboard-level "RSU vests"
annotation paints orange markers on every vest month across all
timeseries panels, with tooltips like "RSU vest: £31232 gross /
£15257 tax withheld".
Shifts Panels 4/5/6/8/9/10 down by 9 rows to make room for Panel 13
at y=29.