Terminal display settings are not persisted across sessions

[blueberrycongee]

Problem

Terminal display settings (e.g. contrast, opacity, font size adjustments) do not persist across app restarts. Users lose their customizations every time they relaunch the app.

Expected behavior

Any terminal display setting changed by the user should be saved and restored on next launch.

Steps to reproduce

1. Adjust a terminal display setting (e.g. contrast)
2. Close and reopen the app
3. Observe that the setting has reverted to default