The inventory screen carried its own const AppDrawer() (no marketEnabled),
so opening the menu from inventory greyed out market/chat/profile — the
recurring 'phase 1' look. It was also reached via go() (route replace),
which is why it showed a hamburger instead of a back arrow like the market.
Make it coherent with the market: reach inventory via push() (from the
home card and the drawer), and drop its drawer so the AppBar shows a back
arrow returning to the home hub. The drawer now lives only on the home
screen, which always passes marketEnabled — the wrong-drawer bug class is
gone. Update the home_screen test to assert the spoke has a back arrow and
no hamburger.