feat: use alternate buffer

[gewenyu99]

Problem

After exiting, we're stuck with the last screen of the terminal and we can't view terminal history .

Changes

Screen.Recording.2026-04-21.at.2.11.34.PM.mov

Screen.Recording.2026-04-21.at.2.00.37.PM.mov

Test plan

[github-actions]

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[sarahxsanders]

this is such a nice improvement