Add tab activity highlighting with grace periods#2329
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Highlight the title of a background tab (bold + orange) when its terminal produces output, clearing once the tab is selected. Gated behind a new "display-tab-activity" setting, off by default. To avoid lighting up every tab on session restore, activity is ignored for adjustable grace periods: a new-tab grace (default 3s) starting at tab creation, and a shorter focus-loss grace (default 1s) when a tab loses focus. The focus-loss grace never shortens an existing longer grace, so the rapid switch-page cascade during restore can't clobber the creation grace. Both periods are configurable in Preferences > General. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Highlight the title of a background tab (bold + orange) when its terminal produces output, clearing once the tab is selected. Gated behind a new "display-tab-activity" setting, off by default. To avoid lighting up every tab on session restore, activity is ignored for adjustable grace periods: a new-tab grace (default 3s) starting at tab creation, and a shorter focus-loss grace (default 1s) when a tab loses focus.