[FEATURE] VSCode Extension: Popup dialogs lack keyboard navigation support

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Summary
When popup dialogs appear in the Claude Code VSCode extension (such as confirmation prompts, file selection dialogs, or action menus), keyboard navigation is not functional. This forces users to switch to mouse interaction, breaking the keyboard-driven workflow.

Steps to Reproduce
Open Claude Code extension in VSCode
Trigger a popup dialog (e.g., AskUserQuestion prompts, permission requests, action confirmations)
Attempt to navigate using keyboard:
Press Tab to move between options
Press ↑/↓ arrow keys to select different items
Press Enter to confirm selection
Expected Behavior
Standard VSCode extension dialog behavior:

Proposed Solution

Suggested Solution
Implement standard accessibility patterns:

Add tabindex attributes to focusable elements
Capture arrow key events for list navigation
Add visual focus styles (outline, highlight)
Implement keyboard event handlers for Enter, Escape, Space
Consider using VSCode's native showQuickPick() or showInputBox() APIs for better consistency

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_