Warp: Claude Code input box renders inside the scrollback instead of anchored at the pane bottom

Is this a reproducible bug?

• I confirm this is a reproducible bug, not a feature request, idea, question, contribution proposal, or direction check.
• I reproduced this bug on the version and environment reported below using the exact steps provided.

Current behavior

When Claude Code runs in a herdr pane with Warp as the outer terminal, its input box is not anchored at the bottom of the pane. The input line renders inside the scrollback — in the attached screenshot it sits right below Claude Code's "done" footer, mid-pane, and scrolls up with the output like ordinary text.

Expected behavior

Claude Code's input box stays redrawn at the bottom edge of the pane. Launching Claude Code directly in the same Warp window (without herdr) renders correctly.

Reproduction

1. Open Warp 0.2026.08.26.17.59.01 on macOS and start herdr.
2. Run claude (Claude Code 2.1.263) in a pane.
3. After a response finishes, the input line is drawn mid-pane in the scrollback instead of at the bottom (screenshot attached).

Impact

Happens every time I start Claude Code in herdr under Warp. The live input floats inside the output, so typing (including Chinese IME) lands where I don't expect it and the pane is hard to use.

Environment

• Herdr version: 0.9.0
• Update channel (stable or preview): stable
• Operating system: macOS 15.7.7 (Apple Silicon)
• Terminal: Warp 0.2026.08.26.17.59.01
• Shell, if relevant: zsh
• Relevant config, if any: local session, single pane per tab, no tmux. Full logs: https://gist.github.com/tttttttwww/7531d478ce5391fdf36f5dea9c0f5ae0