feat(materials): Add setColor method with opacity preservation#137

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maidi29 wants to merge 3 commits intoThatOpen:mainfrom

Commits on Jan 3, 2026

feat(materials): add color-only setColor preserving opacity
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fix(materials): fix processHighlight for preserveOriginalMaterial
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Commits on Jan 4, 2026

fix(materials): Keep opacity from originalDefinition (the true original material definition)
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