Windows app: persist workspace layout and restore last open thread/window

Environment

• Codex Windows app (Microsoft Store)
• Package: OpenAI.Codex
• Version: 26.803.5235.0

Problem

On every restart, the desktop app does not reliably restore the last open thread/window or the user-adjusted pane/column widths and positions. There is also no visible option to launch at sign-in minimized to the background/tray.

Steps to reproduce

1. Open Codex on Windows.
2. Resize/rearrange the sidebar and workspace columns; open a working thread.
3. Close and relaunch the application.

Actual behavior

The app starts without restoring the prior working context and layout; panel widths/positions need to be set again.

Expected behavior

Persist the last active thread/window plus sidebar and panel layout across normal restarts. Ideally provide optional "Launch at login" and "Start minimized to tray" settings.

Impact

This makes daily, short iterative work significantly slower because the work context and UI layout must be rebuilt repeatedly.