🎨 Palette: [UX improvement] Add non-visual confirmation to transient Copy action in Diagnostics

[emkey1]

💡 What: Added non-visual confirmations (haptic feedback, screen reader announcements) and animations to the "Copy Report" button's transient state in AppDiagnosticsView.swift.
🎯 Why: When users tap the button, the text simply changes to "Copied" for a brief moment. Screen reader users might completely miss this state change. Haptics and VoiceOver announcements assure the user the action succeeded.
📸 Before/After: N/A - Mostly an a11y/tactile change, though the visual change now animates gracefully using withAnimation.
♿ Accessibility: Added VoiceOver notification and an accessibility hint.

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PR created automatically by Jules for task 2973724628516917093 started by @emkey1

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