Group C+ fixes

src/components/layout/nav-shell.tsx

@@ -13,8 +13,13 @@ function NavBar() {
   const pathname = usePathname();
   const user = (session as any)?.platformUser;
 
-  const isLogin = pathname === "/login";
-  if (isLogin) return null;
+  // Hide the nav entirely on auth-only routes. These pages have no
+  // session yet — showing "Dashboard" / "Sign Out" is misleading at
+  // best (the buttons would 401 or redirect-loop). Keep this list
+  // narrow and route-exact: anything else we add to the auth flow
+  // (e.g. password reset) needs to be added here too.
+  const isAuthRoute = pathname === "/login" || pathname === "/register";
+  if (isAuthRoute) return null;
 
   return (
     <header className="sticky top-0 z-50 border-b border-border bg-surface-1/80 backdrop-blur-md">