Fix Handle Menu Color & Enable NightMode Toggle

Implemented new themes for handle menu of OnSurface (text) and onSurfaceBright (background).

Also implemented theme toggling for menu when night mode is toggled as per spec, by triggering relayout whenever night mode is changed.

Tested by changing night mode setting manually (swipe down and enable Dark Theme). Manually validated new and existing windows’ handle menus as well as the handle menu with close button visible (on full screen)

Test: Manual
Bug: 276785394
Change-Id: I5604eb12325acc1f6d109dbc369a0f62949448ab