🎨 Palette: add .accessibilityElement to emptyState in ContentView.swift

[acebytes]

💡 What: Added .accessibilityElement(children: .combine) to the emptyState VStack in ContentView.swift.
🎯 Why: To ensure VoiceOver users hear the empty state icon, headline, and description as a single cohesive message rather than disjointed elements.
📸 Before/After: Visuals remain unchanged; screen reader experience is improved.
♿ Accessibility: VoiceOver now announces the empty state holistically, improving context comprehension.

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PR created automatically by Jules for task 15931211040318146133 started by @acebytes

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