41832 Plumb –enable-asserts through to frontend_server invocation in debug… (cla: yes, tool)

41857 Change the dark theme elevation overlay to use the colorScheme.onSurface (cla: yes, f: material design, framework, severe: API break)

41859 CupertinoTheme & CupertinoTextTheme dark mode updates (a: tests, cla: yes, f: cupertino, f: material design, framework, severe: API break, will affect goldens)

41862 Make output directory a build input (cla: yes, tool)

41864 Update BottomAppBar to use elevation overlays when in a dark theme (cla: yes, f: material design, framework)

41879 Make MouseTracker.sendMouseNotifications private (cla: yes, framework)