🎨 Palette: Enhance App Diagnostics button feedback and accessibility

[emkey1]

💡 What: Added visual state animations (withAnimation), haptic feedback (UINotificationFeedbackGenerator), and dynamic accessibilityLabel / accessibilityHint strings to the primary buttons in AppDiagnosticsView ("Copy Report", "Run Diagnostics", "Close").
🎯 Why: To provide tactile, visual, and screen reader-friendly non-visual confirmation for user actions (like copying text or starting an async diagnostic run).
📸 Before/After: Visual toggle of the "Copied" and "Running..." texts is now animated smoothly instead of abrupt jumps.
♿ Accessibility: Improved screen reader support with actionable hints and state announcements (e.g., announcing "Report copied to clipboard").

---

PR created automatically by Jules for task 12042883502467695602 started by @emkey1

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.