fix: add tui.alternate_screen config and --no-alt-screen CLI flag for Zellij scrollback#8555

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hjanuschka wants to merge 3 commits intoopenai:mainfrom

hjanuschka:fix/zellij-scrollback-issue-2558

Commits on Jan 7, 2026

fix: add tui.alternate_screen config and --no-alt-screen CLI flag
hjanuschka
committed
fix: make enter_alt_screen() respect alt_screen_enabled flag
hjanuschka
committed

Commits on Jan 8, 2026

test: include alternate_screen in tui default
hjanuschka
committed