Codex Desktop visibly twitches/reflows on screen refresh when sidebar is open

What happened?

Codex Desktop has a visible UI twitch / layout reflow on each screen refresh when the left sidebar is open.

This does not appear to be project-specific. It reproduces across workspaces and looks like an app-level layout/repaint issue rather than anything caused by repo code.

Steps to reproduce

1. Open Codex Desktop.
2. Keep the left sidebar open.
3. Trigger or wait for a screen refresh / app refresh while working in any thread.
4. Observe the main UI visibly twitch/jump/reflow.
5. Collapse/close the sidebar and repeat; the visible twitch is reduced or avoided.

Expected behavior

The main pane should refresh without visible layout jitter when the sidebar is open.

Actual behavior

The UI visibly twitches/reflows on refresh when the sidebar is open.

Scope

• Reproduces across projects/workspaces.
• Appears tied to the Codex Desktop app chrome/sidebar state.
• Workaround: collapse the sidebar before refresh-heavy work.

Environment

• Codex Desktop: 26.506.31421
• Build: 2620
• macOS: 26.4.1 (25E253)
• Architecture: arm64

Additional notes

I do not have a screen recording attached yet, but the repro is visible during normal use when the sidebar is open.