feat: add Categorized Home Page feature card (MPS-24)

Shoppers browse a tagged catalog by chip filter or sectioned lanes
instead of scrolling a flat list. Bulk tag editor keeps a large
catalog tidy. Fewer clicks, more sales.

Adds:
- index.html: "Categorized Home Page" mps-card in the "Everything a
  creator needs" grid
- pricing.html: "Categorized home page (tags, chips, lanes)" in the
  "Every shop includes" list

index.html

@@ -146,6 +146,12 @@ Open source & public domain — no moat, no castle, just infrastructure
             <span class="mps-card-desc">Run eBay-style auctions with reserve, soft-close, and proxy bidding. Or accept offers and negotiate. Auto-accept high offers, auto-decline lowballs. Live countdowns, configurable pay windows, full email + in-app notification at every state. All commission-free, paid through your existing checkout.</span>
           </div>
 
+          <div class="mps-card">
+            <span class="mps-card-icon">&#128451;</span>
+            <span class="mps-card-title">Categorized Home Page</span>
+            <span class="mps-card-desc">Tag your products and shoppers browse by topic instead of scrolling a flat list. Filter chips above the grid, or full sectioned lanes per category. Bulk tag editor keeps a large catalog tidy. Fewer clicks, more sales.</span>
+          </div>
+
           <div class="mps-card">
             <span class="mps-card-icon">&#128276;</span>
             <span class="mps-card-title">In-app Notifications</span>