fix(tui): statusline command spawns visible console windows on Windows (missing windowsHide)

Environment

• kimi-code 0.40.1, native Windows CLI, Windows 11 + Windows Terminal

Problem

When a [status_line] command is configured, the TUI re-runs the external command on a fixed interval. On Windows each spawn briefly opens a visible console window because the child process is created without windowsHide: true. With the default rerun cadence a console window pops up every few seconds over whatever the user is doing.

Repro

1. On Windows, set a statusline command in tui.toml ([status_line] command = "python statusline.py").
2. Watch the screen: a console window flashes every refresh cycle.

Analysis

In the statusline runner (status-line-command.ts) the spawn options omit windowsHide. The SDK hook spawn chain already sets windowsHide: true — which is why hooks never flash; the statusline runner does not.

Fix

Add windowsHide: true at the two spawn call sites in the statusline runner. We have been running this as a local patch; happy to open a PR.

Start in the status-line runner, status-line-command.ts, and inspect the two spawn call sites described in the issue. Compare their options with the SDK hook spawn chain, which already uses windowsHide. Done means statusline commands no longer flash visible console windows on Windows during refreshes.