table th switched to background: transparent + text-transform: uppercase
in a past redesign, but a.tooltip (the link wrapping every <th>'s text
across the whole dashboard) still hardcoded color: #FFFFFF from the old
solid-indigo-background header design. With no colored block behind it
anymore, white text sits directly on --page-bg/--content-bg (near-white),
making every table header effectively unreadable.
Switch a.tooltip to color: var(--content-text) (dark, same variable the
th itself already uses) so header text is visible again.
yuancheng