[FEATURE] Backward-kill-word (Ctrl+Backspace) action for chat input

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

Currently Claude Code has no action for deleting the previous word in the chat input.

PSReadLine (PowerShell), readline (bash), and most terminal editors support this as a standard editing shortcut (Ctrl+Backspace or Ctrl+W).

Proposed Solution

Request: add a chat:backwardKillWord action that can be bound to Ctrl+Backspace in keybindings.json.

Alternative Solutions

_No response_

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_