[BUG] Dispatch (iPad): no clear visual feedback after tapping approval prompt buttons

Summary

When using Claude Code Dispatch on iPad, tapping a button in an approval prompt
(e.g. Allow / Deny, or AskUserQuestion options) gives no clear visual confirmation
of which option was selected. It's difficult to tell whether the tap registered
and which button is now active.

Steps to reproduce

1. Open Dispatch on iPad
2. Trigger any approval prompt (tool permission, AskUserQuestion, etc.)
3. Tap one of the options
4. Observe: no obvious pressed/selected state — unclear which button was chosen

Expected behaviour

A clear visual state change after tapping — e.g. a filled/highlighted button,
a checkmark, or a brief press animation — so the user can confirm their selection
without second-guessing.

Actual behaviour

The selected button looks the same (or nearly the same) as the unselected ones
after tapping. On a touch screen with no cursor hover state, this creates
ambiguity on high-stakes prompts where the wrong tap could approve an unintended action.

Environment

• Device: iPad
• Interface: Dispatch (Claude Code remote/mobile app)

Related issues

• #37317 — mobile prompt rendering and visual state indicators (closed)
• #35637 — approval prompts not rendering on mobile (open)

Suggested fix

Increase contrast between selected and unselected button states. A filled
background or border change on the active option would resolve this.