🎨 Palette: [UX improvement] Add keyboard accessibility focus states to Sidebar navigation

[billlzzz10]

💡 What: Added keyboard accessibility focus states (focus-visible:ring-agent-cyan focus-visible:ring-2 focus-visible:outline-none) to the navigation Link elements and the Language Toggle button in the Sidebar component. Also added aria-hidden="true" to the decorative inner icons.
🎯 Why: To improve the user experience for users who navigate the interface using a keyboard, ensuring they have clear visual indicators of their focused element. This aligns with accessibility best practices.
📸 Before/After: Before, keyboard focus states were not visible or clearly identifiable on sidebar items. Now, focused items highlight elegantly.
♿ Accessibility: Ensures that keyboard users can see their focus state without applying persistent focus outlines for mouse users. aria-hidden="true" prevents screen readers from redundantly announcing the inner decorative icons (since their parent container already uses aria-label).

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PR created automatically by Jules for task 17707875998904762141 started by @billlzzz10

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Summary by cubic

Add keyboard-visible focus rings to Sidebar navigation links and the Language Toggle button to improve focus clarity for keyboard users. Mark decorative inner icons as aria-hidden to prevent duplicate screen reader announcements.

^{Written for commit af1bc72. Summary will update on new commits.}

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