🎨 Palette: Enhance wind speed unit toggle accessibility

[Jandave0]

💡 What: Improved the wind speed unit toggle group by adding role="group", aria-label, aria-pressed states, hover transition colors, and explicit focus-visible states. Also added a learning to .Jules/palette.md.
🎯 Why: Custom inline toggle groups (like unit switchers) need explicit ARIA roles and active state indications to be properly understood by screen readers, which is easily overlooked when not using standard form components. The visual polish improves mouse and keyboard navigation visibility.
📸 Before/After: Before, it was a regular div and the selected button just had a background color. Now, it has focus rings and screen readers can understand the current selected state.
♿ Accessibility: Added role="group", aria-label="Wind speed unit", aria-pressed, and focus-visible:ring-2 focus-visible:ring-border-default for screen readers and keyboard navigation.

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PR created automatically by Jules for task 11005600071662813348 started by @Jandave0

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