🎨 Palette: Add .accessibilityElement(children: .combine) to Risk Warning in InterventionConfirmSheet.swift

[acebytes]

💡 What: Added .accessibilityElement(children: .combine) to the HStack displaying the risk warning in InterventionConfirmSheet.swift.
🎯 Why: To ensure VoiceOver reads the warning icon and the risk text as a single cohesive statement rather than separate elements, providing better context for screen reader users.
📸 Before/After: Visual presentation is unchanged. VoiceOver now reads the entire warning block together.
♿ Accessibility: Improves VoiceOver experience for critical intervention warnings by grouping the icon and text logically.

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PR created automatically by Jules for task 16460823009451078759 started by @acebytes

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