🎨 Palette: Improve navigation accessibility with aria-labels

[vireapp]

This PR improves the accessibility of the navigation menus by adding aria-label attributes to the links and buttons.

Changes:

• In src/components/mobile-nav.tsx: Added aria-label={item.title} to the Link components. This is crucial as these links only contain icons and decorative elements, making them inaccessible to screen readers without a label.
• In src/components/dashboard-nav.tsx: Added aria-label={item.label} to the Button components. While these have text labels, they are hidden on mobile viewports, leaving only the icon visible. The aria-label ensures the purpose is announced even when the text is visually hidden.

Verification:

• Verified using a Playwright script that inspected the aria-label attributes on the rendered DOM elements.
• Confirmed that the correct labels ("Home", "Friends", "Messages", "Rooms") are present on both navigation components.
• Ran npm run lint and npm run build to ensure no regressions.

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PR created automatically by Jules for task 5488879342864255217 started by @vireapp

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