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/components/VersandModal.tsx

@@ -3,14 +3,25 @@
 import { useEffect, useRef } from "react";
 import { AnimatePresence, motion } from "motion/react";
 import { VersandSections } from "../versand/components/VersandSections";
+import type { ShippingSettings } from "../lib/payload";
 
 /**
  * Quick-reference version of /versand, opened from the cart's order
  * summary "Versand" info link — a full page navigation would pull you out
  * of checkout, which is exactly what the link is there to avoid. Reuses
  * VersandSections so the two never carry different numbers/copy.
+ * `shipping` is threaded down from CartContent/CheckoutContent's own page
+ * (a Server Component), not fetched here — this is a Client Component.
  */
-export function VersandModal({ open, onClose }: { open: boolean; onClose: () => void }) {
+export function VersandModal({
+  open,
+  onClose,
+  shipping,
+}: {
+  open: boolean;
+  onClose: () => void;
+  shipping: ShippingSettings;
+}) {
   const dialogRef = useRef<HTMLDivElement>(null);
   const closeButtonRef = useRef<HTMLButtonElement>(null);
 
@@ -98,7 +109,7 @@ export function VersandModal({ open, onClose }: { open: boolean; onClose: () =>
             </div>
 
             <div className="px-8 py-6 pb-8">
-              <VersandSections />
+              <VersandSections shipping={shipping} />
             </div>
           </motion.div>
         </motion.div>