🎨 Palette: Add VoiceOver/haptic feedback for transient copy action

[emkey1]

💡 What: Added haptic feedback (UINotificationFeedbackGenerator) and explicit VoiceOver announcements (UIAccessibility.post) to the "Copy First Tab Values" button in TerminalSettingsView.swift.
🎯 Why: The "Copied!" state is transient (lasts 2 seconds). Without non-visual feedback, screen reader users and users relying on haptics miss the confirmation that their action succeeded.
📸 Before/After: N/A (non-visual change)
♿ Accessibility: Ensures the transient state change is announced to VoiceOver and provides physical confirmation via haptics.

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PR created automatically by Jules for task 5661078961408477759 started by @emkey1

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