Consolidate theme radius/shadow props and make rounded utilities responsive

- Remove duplicate roundedness/shadowLevel props (keep radius/shadow)
- Switch globals.css radius scale to proportional (square→pill works)
- Replace rounded-full with rounded-md on theme-driven elements
- Remove banner props from Navigation, drop publishing overlay

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/navigation/navigation.tsx

@@ -13,8 +13,6 @@ export type NavigationProps = {
   showCart: "yes" | "no";
   sticky: "yes" | "no";
   tone: "default" | "muted" | "inverse";
-  bannerText: string;
-  bannerTone: "default" | "accent" | "inverse";
 };
 
 export function Navigation({
@@ -25,8 +23,6 @@ export function Navigation({
   showCart,
   sticky,
   tone,
-  bannerText,
-  bannerTone,
 }: NavigationProps) {
   const [mobileOpen, setMobileOpen] = useState(false);
   const cart = useShopifyCart();
@@ -38,14 +34,6 @@ export function Navigation({
     inverse: "bg-foreground text-background",
   };
 
-  const bannerToneClass: Record<NavigationProps["bannerTone"], string> = {
-    default: "bg-muted text-foreground",
-    accent: "bg-primary text-primary-foreground",
-    inverse: "bg-foreground text-background",
-  };
-
-  const hasBanner = typeof bannerText === "string" && bannerText.trim().length > 0;
-
   return (
     <>
       <div
@@ -54,13 +42,6 @@ export function Navigation({
           sticky === "yes" && "sticky top-0 z-40",
         )}
       >
-        {hasBanner && (
-          <div className={cn("w-full", bannerToneClass[bannerTone])}>
-            <div className="container mx-auto max-w-7xl px-6 py-2 text-center text-xs tracking-wide md:text-sm">
-              {bannerText}
-            </div>
-          </div>
-        )}
       <header
         className={cn(
           "w-full",