Two related fixes from user feedback on the keyboard nav:
1. Focused and selected controls were drawing the same 2px accent border
so it was impossible to tell where the keyboard cursor was on a row
that happened to also be the current value. Focused now uses a 3px
accent border plus a translucent accent fill; selected keeps its 2px
border with no fill. Centralized into focusBorderColor /
focusBorderWidth / focusFillColor so all components share the look.
2. Backing out of the body to the sidebar (h/Left/Esc) left the focus
ring lingering on the body item. FocusScope was restoring activeFocus
to its remembered descendant when navRoot reclaimed focus.
exitBodyZone (and onActiveCategoryChanged when not in body mode) now
clears focus from the previously active descendant before forcing
focus back onto navRoot.
Ryan Hughes
9bb35dd7c1