🎨 Palette: Transient Accessibility Feedback for Copy Actions

[emkey1]

💡 What: Added transient accessibility feedback for copy actions in TerminalSettingsView and AppDiagnosticsView by utilizing UINotificationFeedbackGenerator, UIAccessibility.post, and withAnimation. Added an accessibilityLabel and accessibilityHint properties for copy and diagnostic UI elements.
🎯 Why: Sighted users benefit from animations for transient actions. Blind users relying on VoiceOver need explicit audio confirmation of silent copy operations because a visual "Copied!" state cannot always be perceived easily in a fluid UI workflow.
📸 Before/After: N/A
♿ Accessibility: Provides robust confirmation of transient events via a combination of animations, haptic engine integration, and dynamic state announcement logic.

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PR created automatically by Jules for task 17257399956115146788 started by @emkey1

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