feat(ernten): show only the remaining jars per batch

The batch list on a harvest page no longer states the batch's total
size ("12 von 300 Gläsern verfügbar"). It now reads "Es sind noch 12
Gläser verfügbar", with dedicated wording for a single jar and for a
sold-out batch, which reads scarcer and nudges customers to buy.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

src/app/ernten/[year]/[type]/page.tsx

@@ -76,10 +76,12 @@ export default async function HarvestDetailPage(
                   <span className="flex items-center justify-between gap-4 text-sm">
                     <span className="font-serif text-xl text-heading tabular-nums">{batch.code}</span>
                     <span className="text-ink/65 tabular-nums">
-                      {t.erntenDetailPage.glassesAvailable(batch.remainingGlasses, batch.glassCount)}
+                      {t.erntenDetailPage.glassesAvailable(batch.remainingGlasses)}
                     </span>
                   </span>
-                  {/* Fuellstand der Charge — die Zahl rechts bekommt eine Form. */}
+                  {/* Fuellstand der Charge. Der Text nennt bewusst nur den Rest,
+                      nicht die Gesamtmenge: "noch 12 verfuegbar" wirkt knapper
+                      und kaufanregender als "12 von 300". */}
                   <span aria-hidden="true" className="mt-3 block h-1.5 overflow-hidden rounded-full bg-ink/10">
                     <span
                       className="motion-grow block h-full origin-left rounded-full bg-gradient-to-r from-honey-dark to-honey animate-[wh-grow_0.9s_var(--ease-arrive)_both]"