Update the visual styling for pull request rounds to provide better visual distinction between active and inactive rounds. Changes include: - Better background colors for active rounds (blue tint) - Improved text contrast in both light and dark modes - Consistent border handling and overflow clipping Signed-off-by: eti <eti@eti.tf> appview/pages/templates/repo/pulls: fix collapse comments background color in dark mode Signed-off-by: eti <eti@eti.tf>