fix: detect painter canvas emptiness from pixel data, not stroke flags#12009

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christian-byrne wants to merge 2 commits intomainfrom

fix/painter-serialize-preserves-modelvalue-on-remount

Commits on May 6, 2026

fix: painter widget preserves mask reference across WidgetPainter remount
christian-byrne
committed
fix: detect canvas emptiness from pixel data, not stroke flags
christian-byrne
committed