🎨 Palette: Add typing audio feedback to custom terminal keys

[emkey1]

💡 What: Added standard iOS typing audio feedback to the custom keys (Esc, Tab, Ctrl, /, -, Settings) in the terminal accessory view.
🎯 Why: Previously, tapping these buttons was silent, breaking the expected native iOS keyboard experience. Now they play the standard iOS input click sound, providing immediate, expected auditory feedback to the user.
📸 Before/After: The accessory bar looks the same, but tapping keys now plays the iOS click sound.
♿ Accessibility: Improves non-visual feedback during typing.

---

PR created automatically by Jules for task 282619815143462468 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.