feat(shipping): move delivery-time settings to Payload, polish product/cart CTAs

The delivery-time range (handling + transit days) was a hardcoded
HANDLING_DAYS/TRANSIT_DAYS_DE pair in lib/shipping.ts — changing it
needed a code deploy. Now sourced from Payload's new Shipping Settings
collection via getShippingSettings(), threaded down as a prop to the
few Client Components (Cart/Checkout/VersandModal) that can't fetch it
themselves, with the old code constants removed.

Also: the delivery-time note is now shown on every purchase CTA (shop
grid, home spotlight, ToDo-Karten hero + pricing panel), not just one
of them — required next to each buy button per Art. 246a §1 Abs.1
Nr.8 EGBGB, not just somewhere reachable via a link. Checkout's
sidebar was missing the "ab 39€ kostenlos" note Cart already had;
that's fixed too, and both now show the delivery-time range on its own
line instead of crammed onto the shipping-cost line.

Related smaller fixes bundled in since they touch the same files:
price/delivery-time spacing tightened into its own group, the
redundant "Sichere Zahlung" note under Cart's checkout button (already
shown via the trustBadges list right below) replaced with "Sichere
SSL-Verschlüsselung" to match Checkout, and ToDo-Karten's pricing panel
no longer shows a premature payment-security note at the add-to-cart
step.

app/versand/page.tsx

@@ -4,6 +4,7 @@ import { Reveal } from "../components/Reveal";
 import { Footer } from "../components/Footer";
 import { VersandSections } from "./components/VersandSections";
 import { VersandTOC } from "./components/VersandTOC";
+import { getShippingSettings } from "../lib/payload";
 
 export const metadata: Metadata = {
   title: "Versand",
@@ -12,7 +13,9 @@ export const metadata: Metadata = {
   alternates: { canonical: "/versand" },
 };
 
-export default function VersandPage() {
+export default async function VersandPage() {
+  const shipping = await getShippingSettings();
+
   return (
     <>
       <main className="flex flex-col flex-1 bg-bg-base">
@@ -38,7 +41,7 @@ export default function VersandPage() {
             <VersandTOC />
           </div>
           <div className="w-full lg:flex-1 max-w-[45rem]">
-            <VersandSections withAnchors />
+            <VersandSections withAnchors shipping={shipping} />
           </div>
         </div>
       </main>