Cap Newsletter card at 1280px, show an explicit "Keine Versandkosten" hint, generalize the /versand exemption note

- Newsletter.tsx: max-w-[1280px] mx-auto, matching /lebensuhr's own
  newsletter-style section and Footer.tsx's existing 1280px convention —
  previously unbounded and stretched edge-to-edge on wide viewports.
- Product pages: noShippingCost now shows "Keine Versandkosten" instead
  of just omitting "zzgl. Versand" silently.
- /versand's exemption note no longer implies only digital products can
  be exempt — noShippingCost is a general per-product flag.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/todo-cards/components/Pricing.tsx

@@ -97,14 +97,13 @@ export async function Pricing() {
               )}
               <p className="font-bold text-h3 text-text-primary">{formatPrice(product.price)}</p>
             </div>
-            {(() => {
-              const priceHint = kleinunternehmer
+            <p className="text-label text-text-muted">
+              {kleinunternehmer
                 ? product.noShippingCost
-                  ? null
+                  ? "Keine Versandkosten"
                   : "zzgl. Versand"
-                : `inkl. ${taxRate}% MwSt.${product.noShippingCost ? "" : " zzgl. Versand"}`;
-              return priceHint && <p className="text-label text-text-muted">{priceHint}</p>;
-            })()}
+                : `inkl. ${taxRate}% MwSt. ${product.noShippingCost ? "– keine Versandkosten" : "zzgl. Versand"}`}
+            </p>
             {!product.noShippingCost && (
               <p className="text-label text-text-muted">
                 Lieferzeit: {shipping.totalDays.min}–{shipping.totalDays.max} Werktage innerhalb Deutschlands

app/todo-cards/components/TodoKartenHero.tsx

@@ -124,14 +124,13 @@ export async function TodoKartenHero() {
                     <p className="text-body text-text-muted line-through">{formatPrice(product.compareAtPrice!)}</p>
                   )}
                   <p className="font-bold text-h3 text-text-primary">{formatPrice(product.price)}</p>
-                  {(() => {
-                    const priceHint = kleinunternehmer
+                  <p className="text-label text-text-muted">
+                    {kleinunternehmer
                       ? product.noShippingCost
-                        ? null
+                        ? "Keine Versandkosten"
                         : "zzgl. Versand"
-                      : `inkl. ${taxRate}% MwSt.${product.noShippingCost ? "" : " zzgl. Versand"}`;
-                    return priceHint && <p className="text-label text-text-muted">{priceHint}</p>;
-                  })()}
+                      : `inkl. ${taxRate}% MwSt. ${product.noShippingCost ? "– keine Versandkosten" : "zzgl. Versand"}`}
+                  </p>
                 </div>
               )}
               {!product?.noShippingCost && (