When kiwi paints have colorVar with a variable alias, resolve the
color through the variable's valuesByMode instead of using the stale
paint.color fallback. This fixes fills that reference design tokens
(Tokens → Primitives alias chain) where the paint.color contains
the library's published value but the local variable resolves to
a different color.
Build a variable color resolver from VARIABLE NCs during import,
walk alias chains through default mode values, and use the resolved
color in convertFills/convertStrokes.
Fixes Indicator, Link, Placeholder, and other variable-bound fill
colors in Preline UI and similar files with design token systems.
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