Fix Dark Mode colors hovering navigation bar status tabs master
Summary: * Use `{$orange}` variable for warning text instead of hardcoding text color. * On hover, use `{$alphagrey}` variable for warning and fail text instead of hardcoding text color. This makes text readable in both dark mode and default mode. Refs T15056 Test Plan: * Go to http://phorge.localhost/settings/panel/display/ and set `Accessibility` to `Dark Mode (Experimental)` * Go to http://phorge.localhost/uiexample/view/PHUIListExample/, look at the "Status Tabs" section, hover over items * Repeat previous step with `Default Mode` instead of Dark Mode Reviewers: O1 Blessed Committers, valerio.bozzolan Reviewed By: O1 Blessed Committers, valerio.bozzolan Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T15056 Differential Revision: https://we.phorge.it/D26372