Add Container component and fix radius/maxWidth theming

- Drop buttonRadius prop; button now uses --radius via rounded-md
- Inject @theme radius mappings into ThemeProvider so rounded-* utilities
  pick up --radius inside the Tailwind CDN iframe
- Add shared Container that consumes --container-max-width set from the
  global maxWidth prop, replacing ad-hoc "container mx-auto max-w-7xl px-6"
  wrappers across commerce, landing, footer, navigation, and others
- Simplify maxWidth options to Small/Medium/Large/X-Large/Full bleed and
  shift the scale up so Large (1280px) matches the previous default

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

components/logos/logos.tsx

@@ -1,3 +1,5 @@
+import { Container } from "@/components/layout/Container";
+
 export type LogosProps = {
   tagline: string;
   items: Array<{ src: string; alt: string }>;
@@ -7,7 +9,7 @@ export type LogosProps = {
 export function Logos({ tagline, items, layout }: LogosProps) {
   return (
     <section className="border-y border-border bg-muted/40 py-12">
-      <div className="container mx-auto max-w-7xl px-6">
+      <Container>
         {tagline ? (
           <p className="mb-8 text-center text-xs uppercase tracking-[0.2em] text-muted-foreground">
             {tagline}
@@ -38,7 +40,7 @@ export function Logos({ tagline, items, layout }: LogosProps) {
             ))}
           </div>
         )}
-      </div>
+      </Container>
     </section>
   );
 }