e1b959a36f
The `/sessions` picker's selection background was subtle enough to disappear in low-contrast dark themes — keyboard navigation moved the focus indicator but the visual change between focused and unfocused rows was hard to notice, especially when running the TUI in a terminal with a near-black background. The selected row now renders with a bolded label on a stronger background so the focused row reads cleanly across the dark palettes the TUI ships with. The non-selected rows are unchanged so the change doesn't add visual noise on light terminals. Test pin: `build_list_lines_selected_row_uses_strong_highlight` ensures the rendered row at the selected index applies the expected modifier and background combination. Harvested from PR #1493 by @reidliu41 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>