Support AskUserQuestion tool with multiple-choice options on mobile

[nikhilsitaram]

Feature Request

When Claude Code calls the AskUserQuestion tool, the mobile interface shows raw JSON and only yes/no buttons. The actual question text and multiple-choice options aren't rendered, and there's no way to select a specific option.

Current Behavior

1. Claude calls AskUserQuestion with structured input:

   {
     "questions": [{
       "question": "Which approach should we use?",
       "options": [
         { "label": "Option A", "description": "..." },
         { "label": "Option B", "description": "..." }
       ]
     }]
   }

2. Happy routes it through the generic permission system (--permission-prompt-tool stdio)
3. Mobile shows "Claude wants to Ask User Question" with raw JSON arguments
4. User can only tap Approve/Deny
5. On approve, handlePermissionResponse returns the original input unchanged — no selection is captured

Expected Behavior

• Mobile UI detects AskUserQuestion tool calls and renders the question text and option buttons
• User taps an option (or types a custom response)
• The selection is sent back and injected into the response to Claude

Technical Context

The limitation is in the permission response format — it only carries approved, reason, mode, and allowTools. There's no field to carry the user's selection back. The handlePermissionResponse method resolves with { behavior: "allow", updatedInput: pending.input } (original input, unchanged).

This would require changes in:

1. Mobile app: Detect AskUserQuestion in agent state requests, render question/options UI
2. Permission response schema: Add a field for user selection (e.g. answer or selectedOptions)
3. CLI handler: handlePermissionResponse to construct a proper response for Claude with the user's answers

Workaround

For now, Claude can use the <options> XML block in its text output (which Happy already renders as tappable buttons) instead of the AskUserQuestion tool when running through Happy.