🎨 Palette: Add aria-live="polite" to examples search empty state

[MilakyS]

💡 What: Added aria-live="polite" attribute to the .examples-empty container in examples.html.

🎯 Why: Ensures screen reader users receive immediate, polite feedback when searching or filtering examples returns zero matching items.

♿ Accessibility: Implements WAI-ARIA live region for dynamic empty state updates.

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PR created automatically by Jules for task 5302567843438466662 started by @MilakyS

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