## Why
Async questions with suggested choices only accepted those choices. Allow users to write an alternative answer directly in the question pane.
## What changed
- Append an editable Other choice. Typing or pasting opens it, while number shortcuts still submit named choices.
- Preserve custom drafts when switching choices, reject blank Other submissions, and distinguish the input from a suggested choice named Other.
- Support Vim editing and search in question inputs while keeping arrow keys available for choice navigation.
- Wrap custom answers inline, cap the editor height, and keep the input visible in narrow layouts.
## Testing
Add interaction tests and snapshots covering custom answer delivery, draft preservation, selector key repeats, blank answers, remapped shortcuts, Vim editing and search, and narrow or wrapped layouts.
GitOrigin-RevId: 0e9aa9fcd2410e8da25f5ca43bdef94cbb9253b8
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