Follow Products.description consolidation to richText-only

Backend dropped the plain-text description field in favor of a single
richText one (see docker/payload commit 1ba8d07). Renders formatted
(bold/italic/multiple paragraphs) via the shared RichText component on
the PDP (der-eine, tasse-die-pause); everywhere else (Passend-dazu cards,
Product JSON-LD, homepage spotlight fallback) derives plain text at read
time via a new extractPlainText() helper instead of a second field.
Removes the description line from cart line items entirely — it only
bloated the cart with no real benefit there.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J1Hu5bZ1kZUgKhab6yNwCt

app/tasse-die-pause/components/Hero.tsx

@@ -2,6 +2,7 @@ import Link from "next/link";
 import Image from "next/image";
 import { AddToCartButton } from "../../components/AddToCartButton";
 import { Reveal } from "../../components/Reveal";
+import { RichText } from "../../components/RichText";
 import { getProductBySlug, getShippingSettings, getDefaultTaxRatePercent, getKleinunternehmer } from "../../lib/payload";
 import { formatPrice, discountPercent } from "../../lib/format";
 import { effectiveTaxRate } from "../../lib/cartTotals";
@@ -50,7 +51,7 @@ export async function Hero() {
               {product?.name ?? "Tasse"}
             </p>
 
-            {product?.description && <p className="text-body text-text-body">{product.description}</p>}
+            {product?.description ? <RichText content={product.description} /> : null}
 
             <div className="flex flex-col gap-1 items-start">
               {product && (

app/tasse-die-pause/components/Pricing.tsx

@@ -1,6 +1,7 @@
 import Image from "next/image";
 import { AddToCartButton } from "../../components/AddToCartButton";
 import { Reveal } from "../../components/Reveal";
+import { RichText } from "../../components/RichText";
 import { getProductBySlug, getShippingSettings, getDefaultTaxRatePercent, getKleinunternehmer } from "../../lib/payload";
 import { formatPrice, discountPercent } from "../../lib/format";
 import { effectiveTaxRate } from "../../lib/cartTotals";
@@ -48,7 +49,7 @@ export async function Pricing() {
           >
             {product.name}
           </p>
-          {product.description && <p className="text-body-sm text-text-primary">{product.description}</p>}
+          {product.description ? <RichText content={product.description} /> : null}
         </div>
 
         <div className="flex flex-col gap-3 items-start w-full lg:w-[18.75rem] lg:shrink-0">