[FEATURE] Support tab completion in bash mode

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

In bash mode, I would like to have tab completion of commands and file names available. Tab would be overloaded apparently, but optional remapping of either tab completion or thinking mode would work for me. I am also very new to using claude code so I could be misunderstanding the use case for bash mode. I use it to manually enter commands - for which I normally use tab completion a lot. It's ingrained in my muscle memory so deeply that I find I can't really use a shell effectively without it.

Proposed Solution

I would like pressing tab to trigger the usual shell tab completion. Perhaps with options to remap either tab completion or thinking mode to a different hot key.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_