[BUG] `dG` in Vim mode does not delete all lines

Environment

• Platform (select one):
• [ ] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.89
• Operating System: WSL Ubuntu 25.04
• Terminal: Wezterm

Bug Description

dG in Vim mode should delete all lines, but actually, the last line is not deleted.

Steps to Reproduce

1. /vim
2. input some text in insert mode
3. dG in normal mode

Expected Behavior

All lines should be deleted.

Actual Behavior

The last line is kept.

Additional Context

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