Input box should stay pinned to the bottom while scrolling (currently scrolls away)

Problem

In the interactive TUI, the input box does not stay docked at the bottom of the terminal. When a conversation produces long output and I scroll up to review earlier messages, the input box scrolls out of view along with the content. I then have to scroll all the way back to the bottom before I can continue typing.

This makes reviewing context and entering follow-up messages very painful.

Environment

• OS: macOS
• Terminal: Ghostty
• Kimi Code version: 0.26.0
• Model: deepseek-v4-pro (via OpenAI-compatible provider)

Expected behavior

The input box (and ideally the status line / context info above it) should be pinned to the bottom of the window, with only the conversation area scrolling above it — like Claude Code and most chat UIs.

Steps to reproduce

1. Launch kimi.
2. Run a task that produces long output (e.g. read multiple files / run tests).
3. Scroll up to review earlier content.
4. The input box is no longer visible and cannot be typed into until you scroll back down.

Related

• #875 — same request; proposes a tui.toml option like fixed_input_region = true
• #891 — same symptom report

Start by launching kimi and reproducing the behavior with a task that produces long output, then inspect the interactive TUI layout and scrolling behavior. Keep the conversation area scrollable while the input box and, if supported by the layout, the status/context line remain visible at the bottom during upward scrolling.