[FEATURE] i want to be able to @ reference files from the "other" option input when AskUserQuestion is used

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

I like it when claude code asks questions and provides prepopulated options, but more often than not i use the "other" option to state my specific answer.
However the @ key doesn't work here, even though it would be very helpful if I could reference project files in my response.

Proposed Solution

I'd like it if the @ key worked in the text input where the user can type in their own response.

Alternative Solutions

I just write: "let me describe" and then i use the usual chat input where @ works to say whatever i could have said in the AskUserQuestion text input.

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

User tells the agent to do something.
The agent needs clarification, so prompts the user with a question and provides some options.
The user doesn't like the options as they are presented and wants to add nuance by referencing already existing project files.
The user chooses "Other" and fills the text input, using @ to reference project files.

Additional Context

_No response_