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/commerce/collection-grid.tsx

@@ -2,8 +2,9 @@ import { useEffect, useState } from "react";
 import { Link } from "react-router";
 import { shopifyFetch } from "@/services/shopify/client";
 import { GET_COLLECTIONS_QUERY } from "@/graphql/collections";
-import { Typography } from "@/components/Typography";
 import { Container } from "@/components/layout/Container";
+import { Typography } from "@/components/Typography";
+import { Heading } from "@/components/Heading";
 
 export type CollectionGridProps = {
   tagline: string;
@@ -47,19 +48,15 @@ export function CollectionGrid({
   return (
     <section className="bg-background py-20 md:py-28">
       <Container>
-        <div className="mx-auto mb-12 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-12"
+          maxWidth="max-w-2xl"
+        />
 
         <div
           className={
@@ -90,22 +87,27 @@ export function CollectionGrid({
                 {isEditorial ? (
                   <div className="absolute inset-0 flex items-end bg-gradient-to-t from-black/60 via-transparent to-transparent p-8">
                     <div>
-                      <Typography variant="h4" className="text-white">
+                      <Typography
+                        variant="subtitle1"
+                        className="font-semibold tracking-tight text-white"
+                      >
                         {c.title}
                       </Typography>
                       <span className="mt-2 inline-flex text-xs uppercase tracking-[0.2em] text-white/80">
-                        Shop now →
+                        Shop now
                       </span>
                     </div>
                   </div>
                 ) : null}
               </div>
               {!isEditorial ? (
-                <div className="mt-4 flex items-center justify-between">
-                  <h3 className="text-sm font-medium tracking-tight">{c.title}</h3>
-                  <span className="text-xs text-muted-foreground transition-opacity group-hover:opacity-100">
-                    →
-                  </span>
+                <div className="mt-4">
+                  <Typography
+                    variant="subtitle2"
+                    className="font-medium tracking-tight text-foreground"
+                  >
+                    {c.title}
+                  </Typography>
                 </div>
               ) : null}
             </Link>