Billing rework

src/components/layout/nav-shell.tsx

@@ -59,6 +59,21 @@ function NavBar() {
                   {t("team")}
                 </NavLink>
               )}
+            {/* Bug 35: /settings is shown to anyone who can mutate org-level
+                state — owners and platform admins. Personal accounts also
+                see it; their billing page is optional but the entry point
+                exists for consistency. `user`-role customers don't see it
+                (canMutate is false). */}
+            {user &&
+              (user.isPlatform ||
+                (Array.isArray(user.roles) && user.roles.includes("owner"))) && (
+                <NavLink
+                  href="/settings"
+                  active={pathname.startsWith("/settings")}
+                >
+                  {t("settings")}
+                </NavLink>
+              )}
             {user?.isPlatform && (
               <NavLink href="/admin" active={pathname === "/admin"}>
                 {t("admin")}