Three-column Sankey diagram (Income → Categories → Tags) rendered with
custom matplotlib bezier paths. Features gradient-fill bands that
interpolate color from source to destination nodes, neon glow effects
on nodes and bands, and a surplus node when income exceeds expenses.
Also fixes QFont::setPointSize warning by switching dark.qss font-size
units from px to pt, preventing Qt delegate code from receiving -1
point sizes during inline cell editing.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
andy
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