Fix mobile AskUserQuestion answers in plan mode

[kevin1sMe]

Summary

• Fix mobile AskUserQuestion submissions in plan mode so Claude receives structured answers instead of an empty selection.
• Pass tool answer data through the permission RPC as updatedInput.
• Merge updatedInput back into the original Claude tool input before allowing the tool call.

Problem

When Claude asked a native AskUserQuestion multiple-choice question, the mobile app handled submission like this:

1. approve the tool
2. send the selected answer as a normal follow-up text message

That ordering is incorrect for AskUserQuestion.

Claude expects the user selections to be returned as part of the tool input itself, using the answers field on AskUserQuestionInput. Because the tool was approved before the structured answers were attached, Claude completed the tool call with empty answers.

This produced behavior like:

{
  "questions": [...],
  "answers": {}
}

and logs like:

User has answered your questions: .

The later mobile text message was treated as a normal user message rather than the result of the pending question tool call.

Fix

• Add updatedInput?: Record<string, unknown> to the session permission RPC payload.
• Change AskUserQuestionView to submit answers as structured data instead of sending a follow-up chat message.
• Build the answer payload in the shape Claude expects, with the full question text as the key and the selected option labels joined as the value.
• Merge updatedInput into the pending Claude tool input in permissionHandler.ts before returning behavior: 'allow'.

Reproduction

1. Start a Claude session in plan mode.
2. Have Claude ask a native AskUserQuestion multiple-choice question.
3. On mobile, select one or more options and submit.
4. Before this fix, Claude may respond as if the user did not select any option.

Validation

Manual

1. Start happy claude.
2. Enter a flow where Claude uses AskUserQuestion in plan mode.
3. Submit an answer from mobile.
4. Confirm Claude continues with the selected answers instead of saying no option was selected.

Type checking

Ran successfully:

• yarn workspace happy typecheck
• yarn workspace happy-app typecheck

Notes

This PR is intentionally scoped to the AskUserQuestion answer transport path between the mobile app and Claude.