The monthly/weekly comparison already drew one colour per item (series =
items). Yearly mode instead coloured by financial year (series = FYs, items on
the x-axis), so multiple cost centres / accounting codes in the same yearly
graph shared colours. Unify all three granularities to series = items: the
x-axis is months / weeks / FYs and each item keeps its own distinct colour
(yearly becomes grouped bars per item rather than per year).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
