Rebrand store as Pulse with athletic theme and shared typography

- Pulse theme tokens in app.schema.json: Archivo Black headings (weight 400)
  + Inter body, white bg / black pill buttons, xl radius, AI-generated
  athletic imagery
- Add headerFontWeight theme prop so single-weight fonts (Archivo Black)
  load and render correctly; ThemeProvider applies font-family + weight
  inline so Typography works regardless of `as` element
- New shared Heading component (tagline / title / subtitle with size +
  align + tone variants) and Typography caption variant for taglines;
  refactor features, faq, cta, testimonials, products-carousel,
  products-grid, collection-grid, recommended-products, image-gallery,
  newsletter-cta to use them
- Hero accepts a `buttons` array (label / href / variant) replacing
  primaryCta/secondaryCta; cover-image component removed and existing
  cover blocks migrated to Hero blocks with `buttons: []`
- Newsletter CTA uses shadcn Button + Input so it inherits theme radius;
  stacked layout fixed to keep the image
- Product/collection card titles use Typography subtitle variants
  (font-body), heading font weight is theme-controlled
- Remove orphan commerce/shop-header.tsx and commerce/shop-footer.tsx;
  the editor-driven navigation/footer are the live chrome

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

components/features/features.tsx

@@ -1,5 +1,6 @@
 import { Typography } from "@/components/Typography";
 import { Container } from "@/components/layout/Container";
+import { Heading } from "@/components/Heading";
 
 export type FeaturesProps = {
   tagline: string;
@@ -19,28 +20,24 @@ export function Features({ tagline, heading, subheading, columns, items }: Featu
   return (
     <section className="bg-background py-20 md:py-28">
       <Container>
-        <div className="mx-auto mb-16 max-w-2xl text-center">
-          {tagline ? (
-            <p className="mb-3 text-xs uppercase tracking-[0.2em] text-muted-foreground">
-              {tagline}
-            </p>
-          ) : null}
-          <Typography variant="h2">{heading}</Typography>
-          {subheading ? (
-            <Typography variant="subtitle1" className="mt-3">
-              {subheading}
-            </Typography>
-          ) : null}
-        </div>
+        <Heading
+          tagline={tagline}
+          title={heading}
+          subtitle={subheading}
+          align="center"
+          size="lg"
+          className="mx-auto mb-16"
+          maxWidth="max-w-2xl"
+        />
 
         <div className={`grid grid-cols-1 gap-x-10 gap-y-12 ${colClass[columns]}`}>
           {items.map((item, i) => (
-            <div key={i} className="border-t border-border pt-6">
-              <p className="mb-3 text-xs tracking-[0.18em] text-muted-foreground">
+            <div key={i} className="flex flex-col gap-3">
+              <Typography variant="caption">
                 {String(i + 1).padStart(2, "0")}
-              </p>
+              </Typography>
               <Typography variant="h5">{item.title}</Typography>
-              <Typography variant="body2" className="mt-3 text-muted-foreground">
+              <Typography variant="body2" className="text-muted-foreground">
                 {item.body}
               </Typography>
             </div>