🎨 Palette: Add transient action feedback and animations to copy buttons

[emkey1]

💡 What: Added withAnimation and UINotificationFeedbackGenerator().notificationOccurred(.success) along with VoiceOver announcements for the "Copy Report" (Diagnostics) and "Copy First Tab Values" (Settings) buttons.
🎯 Why: When a copy button triggers an action, a purely visual state change (e.g. changing text to "Copied!" for 2 seconds) is not announced to VoiceOver users and feels abrupt without animation. This adds tactile feedback and screen-reader announcements to make the interaction satisfying and accessible.
📸 Before/After: Code changes only.
♿ Accessibility: VoiceOver users now hear "Copied report" and "Copied first tab colors", and feel a success haptic, avoiding ambiguity when interacting with these buttons.

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PR created automatically by Jules for task 5041436502765566537 started by @emkey1

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