125235c293
Login/register, forgot-password, reset-password, verify-email, and the
2FA/sessions settings cards all used a bare MuiPaper (1px border, no
shadow) predating this session's theme foundation. MuiPaper itself
stays untouched (it's a lower-level primitive used too broadly across
the app -- menus, popovers -- to safely restyle globally), so these
specific card instances get the same explicit no-border/floating-shadow
treatment already applied screen-by-screen elsewhere this session.
Static shadow value again, not theme.vars.customShadows -- inline sx
callbacks execute against whatever theme is in context, and none of
this repo's tests wrap components in a ThemeProvider (see fc56f94).