Input field won't grow past 2 lines in v2.1.89

Description

After upgrading to v2.1.89, the prompt input field visually caps at 2 lines. Text can still be typed beyond the visible area, but it's not visible — the field doesn't expand.

Reproduction

1. Upgrade to v2.1.89
2. Start a new session (claude)
3. Type or paste a prompt longer than 2 lines
4. Input field stays at 2 lines — text beyond that is invisible

Expected behavior

Input field should grow vertically to show all typed text (as it did in v2.1.87).

Environment

• Claude Code version: 2.1.89
• OS: Linux 6.8.12-16-pve
• Terminal: xterm-256color
• CLAUDE_CODE_NO_FLICKER: tested both 0 and 1, no difference

Notes

• v2.1.87 does not have this issue — input field grows normally
• Rolling back to v2.1.87 is not viable as it lacks statusline support and hook events introduced in v2.1.88+