bug: vim editorMode initializes cursor on line 2 instead of line 1

Summary

When editorMode is set to "vim" in settings.json, the cursor in the input area starts on line 2 instead of line 1 at the beginning of each session.

Environment

• Claude Code version: latest (as of 2026-06-06)
• OS: macOS
• editorMode: "vim" (set in ~/.claude/settings.json)

Steps to Reproduce

1. Set "editorMode": "vim" in ~/.claude/settings.json (or via /config)
2. Start a new Claude Code session
3. Observe the cursor position in the input area

Expected Behavior

The cursor should appear on line 1 of the input area, immediately ready for typing.

Actual Behavior

The cursor appears on line 2. A > character is visible on line 1, and the cursor sits one line below it — requiring the user to navigate up or just accept the offset.

Workaround

Switching editorMode to "normal" resolves the issue. The cursor correctly initializes on line 1.

Additional Context

Confirmed reproducible across sessions. The issue is specific to vim mode — normal mode is unaffected.