refactor: tweaks to styles

- cuesheet action is ghosted
- mute index in cuesheet milestones
- clarify mirrored state in navigation menu
- align overview contents

apps/client/src/common/components/navigation-menu/NavigationMenu.module.scss

@@ -64,3 +64,8 @@
   flex: 1;
   overflow-y: auto;
 }
+
+.note {
+  margin-left: auto;
+  color: $white-20;
+}

apps/client/src/common/components/navigation-menu/NavigationMenu.tsx

@@ -60,6 +60,7 @@ function NavigationMenu({ isOpen, onClose }: NavigationMenuProps) {
             <NavigationMenuItem active={mirror} onClick={toggleMirror}>
               Flip Screen
               <IoSwapVertical />
+              {mirror && <span className={style.note}>Active</span>}
             </NavigationMenuItem>
             <NavigationMenuItem onClick={handlers.open}>Rename Client</NavigationMenuItem>