fix(bestellbestaetigung): rebuild testimonial band, tighten hero, add spotlightEyebrow

Testimonial band: rebuilt as a proper flexbox two-column layout
(photo column with an explicit width, quote in a flex-1 sibling)
instead of an absolutely-positioned text block offset with
percentage margin/padding — that measured against the row's full
width and, combined with a max-w- on the text box, left almost no
room for the actual text on wide viewports (wrapped to one word per
line). Also dropped the muted-bg box behind the quote and widened
the photo fade to match the actual mockup, which has no separate
colored panel there at all.

Hero: removed the separate big checkmark badge — the 4-step bar
right above it already renders every step as a checkmark, so it was
just repeating that. Added more top spacing to compensate. Dropped
"Deine Bestellung macht sich jetzt auf den Weg zu dir." and added
"inkl. MwSt." under Gesamtbetrag for consistency with /cart and
/checkout.

Wired the new Products.spotlightEyebrow field (CMS-editable "Neu im
Shop" label) through lib/payload.ts into ProductSpotlight.tsx.

app/lib/payload.ts

@@ -169,12 +169,14 @@ export async function getProductBySlug(slug: string): Promise<Product | null> {
 }
 
 export type SpotlightProduct = Product & {
+  spotlightEyebrow: string | null;
   spotlightHeadline: string | null;
   spotlightText: string | null;
   spotlightImage: string | null;
 };
 
 type PayloadSpotlightProduct = PayloadProduct & {
+  spotlightEyebrow: string | null;
   spotlightHeadline: string | null;
   spotlightText: string | null;
   spotlightImage: { url: string } | number | null;
@@ -211,6 +213,7 @@ export async function getSpotlightProduct(): Promise<SpotlightProduct | null> {
     compareAtPrice: doc.compareAtPrice ?? null,
     image: typeof doc.image === "object" && doc.image ? doc.image.url : "",
     href: doc.detailHref || null,
+    spotlightEyebrow: doc.spotlightEyebrow || null,
     spotlightHeadline: doc.spotlightHeadline || null,
     spotlightText: doc.spotlightText || null,
     spotlightImage: