🎨 Palette: Make entire category row clickable

[acebytes]

💡 What: Wrapped the CategoryRow HStack in a Button to make the entire row clickable instead of just the checkbox. Added accessibility modifiers to improve screen reader experience.
🎯 Why: Increases the hit target for easier interaction and ensures VoiceOver combines the row elements correctly.
📸 Before/After: No visual change, but the clickable area now spans the entire row.
♿ Accessibility: Added .accessibilityElement(children: .combine) and .accessibilityAddTraits(.isSelected) to the row.

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PR created automatically by Jules for task 9981143443575021498 started by @acebytes

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