🎨 Palette: Make list rows fully clickable

[acebytes]

💡 What
Wrapped the list rows (CategoryRow and NodeModulesRow) in full-width Buttons and applied .contentShape(Rectangle()) instead of relying on the small checkbox onTapGesture.

🎯 Why
Previously, the user had to precisely click the small checkbox icon to select a cache category or project folder. This makes selection much faster and easier for mouse/trackpad users by turning the entire row into a hit target.

📸 Before/After
(Visuals remain identical thanks to .buttonStyle(.plain), but the clickable area expands from a 20x20px circle to the full ~400x40px row).

♿ Accessibility
Combined the child elements into a single cohesive VoiceOver readout using .accessibilityElement(children: .combine). Added the .isButton trait, as well as .isSelected dynamically based on state, significantly improving screen reader navigation.

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PR created automatically by Jules for task 11764635391321077312 started by @acebytes

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