🎨 Palette: Semantic Button Accessibility fixes

[Twinber]

🎨 Palette: Semantic Button Accessibility fixes

💡 What:

• Refactored LanguageSwitcher to use semantic <button> instead of <span> tags. Added clear focus-visible styling and marked the / separator with aria-hidden="true".
• Refactored NetworkItem and GmapsButton to use Radix UI's <Button asChild> to wrap their inner links, removing invalid HTML structures (a button nested inside an anchor tag) that confuse screen readers.
• Fixed a parameter casing lint error in GmapsButton.

🎯 Why:

• Using semantic tags and correctly formed HTML structures is crucial for screen readers and keyboard accessibility.
• The asChild prop on Shadcn UI/Radix components is a highly effective way to apply component styles to native routing tags (like TanStack <Link> or <a>) without generating deeply nested or invalid HTML.

♿ Accessibility:

• Restored keyboard focus traversal for LanguageSwitcher.
• Improved ARIA structure for buttons acting as links.

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PR created automatically by Jules for task 14524418724898109390 started by @Twinber

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