🎨 Palette: Semantic Keyboard Shortcuts

[EiJackGH]

💡 What: Wrapped keyboard controls in <kbd> tags with physical key CSS.
🎯 Why: Improves intuitiveness and discoverability of custom controls.
📸 Before/After: Plain text -> Styled key UI.
♿ Accessibility: Semantic tags provide clearer context for custom shortcuts.

Rationale for custom CSS: The file relies on an internal vanilla <style> block rather than a utility framework. Added custom CSS to match this existing pattern while staying within scope.

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PR created automatically by Jules for task 8150970864005295381 started by @EiJackGH

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