🎨 Palette: Add accessibilityElement(children: .combine) to emptyState in ContentView.swift

[acebytes]

💡 What: Added .accessibilityElement(children: .combine) to the emptyState VStack in ContentView.swift.
🎯 Why: VoiceOver users currently experience the empty state as disjointed fragments (reading the icon and texts separately). Grouping them ensures the empty state is read as a single unified message, improving comprehension.
📸 Before/After: Visuals remain unchanged, but VoiceOver now reads the empty state cohesively.
♿ Accessibility: Yes, improves screen reader experience for the empty state by logically grouping related views.

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PR created automatically by Jules for task 354120025383429079 started by @acebytes

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