fix: add missing Ernten/Schleuderungen list and detail views

The sidebar nav sent both entries straight to their "new" creation
form, with no list page to ever browse what had been created -
Schleuderung creation didn't even redirect to a detail page, just to
/colonies, so a saved extraction left no trace anywhere in the UI.

- New /harvests and /extractions list pages (mirrors the existing
  products/apiaries list pattern).
- New /extractions/[id] detail page + edit dialog, matching the
  harvests one that already existed but had nothing linking to it.
- Sidebar "Ernten"/"Schleuderungen" now point at the list pages instead
  of the creation forms.
- Extraction creation now redirects to its detail page instead of
  /colonies.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

ApiCore-Frontend/src/app/(app)/extractions/[id]/extraction-edit-dialog.tsx

@@ -0,0 +1,129 @@
+"use client";
+
+import { FormEvent, useState } from "react";
+import { Pencil } from "lucide-react";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { updateExtraction } from "@/lib/extractions/api";
+import { Extraction } from "@/lib/extractions/types";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog";
+
+export function ExtractionEditDialog({ extraction }: { extraction: Extraction }) {
+  const queryClient = useQueryClient();
+  const [open, setOpen] = useState(false);
+  const [date, setDate] = useState(extraction.date.slice(0, 10));
+  const [amount, setAmount] = useState(extraction.amount?.toString() ?? "");
+  const [room, setRoom] = useState(extraction.room ?? "");
+  const [waterContent, setWaterContent] = useState(extraction.waterContent?.toString() ?? "");
+  const [temperature, setTemperature] = useState(extraction.temperature?.toString() ?? "");
+  const [notes, setNotes] = useState(extraction.notes ?? "");
+
+  const mutation = useMutation({
+    mutationFn: () =>
+      updateExtraction(extraction.id, {
+        date: new Date(date).toISOString(),
+        amount: amount ? Number(amount) : undefined,
+        room: room || undefined,
+        waterContent: waterContent ? Number(waterContent) : undefined,
+        temperature: temperature ? Number(temperature) : undefined,
+        notes: notes || undefined,
+      }),
+    onSuccess: () => {
+      void queryClient.invalidateQueries({ queryKey: ["extractions", extraction.id] });
+      setOpen(false);
+    },
+  });
+
+  function handleSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    mutation.mutate();
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={setOpen}>
+      <DialogTrigger
+        render={
+          <Button variant="outline" size="sm">
+            <Pencil className="size-3.5" />
+            Bearbeiten
+          </Button>
+        }
+      />
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>Schleuderung bearbeiten</DialogTitle>
+        </DialogHeader>
+        <form className="flex flex-col gap-4" onSubmit={handleSubmit}>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="extraction-edit-date">Datum</Label>
+            <Input
+              id="extraction-edit-date"
+              type="date"
+              value={date}
+              onChange={(event) => setDate(event.target.value)}
+            />
+          </div>
+          <div className="flex gap-3">
+            <div className="flex flex-1 flex-col gap-2">
+              <Label htmlFor="extraction-edit-amount">Menge (kg)</Label>
+              <Input
+                id="extraction-edit-amount"
+                type="number"
+                value={amount}
+                onChange={(event) => setAmount(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-1 flex-col gap-2">
+              <Label htmlFor="extraction-edit-room">Schleuderraum</Label>
+              <Input
+                id="extraction-edit-room"
+                value={room}
+                onChange={(event) => setRoom(event.target.value)}
+              />
+            </div>
+          </div>
+          <div className="flex gap-3">
+            <div className="flex flex-1 flex-col gap-2">
+              <Label htmlFor="extraction-edit-water">Wassergehalt (%)</Label>
+              <Input
+                id="extraction-edit-water"
+                type="number"
+                value={waterContent}
+                onChange={(event) => setWaterContent(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-1 flex-col gap-2">
+              <Label htmlFor="extraction-edit-temperature">Temperatur (°C)</Label>
+              <Input
+                id="extraction-edit-temperature"
+                type="number"
+                value={temperature}
+                onChange={(event) => setTemperature(event.target.value)}
+              />
+            </div>
+          </div>
+          <div className="flex flex-col gap-2">
+            <Label htmlFor="extraction-edit-notes">Notizen</Label>
+            <Textarea
+              id="extraction-edit-notes"
+              value={notes}
+              onChange={(event) => setNotes(event.target.value)}
+            />
+          </div>
+          <Button type="submit" disabled={mutation.isPending}>
+            {mutation.isPending ? "Speichert…" : "Speichern"}
+          </Button>
+        </form>
+      </DialogContent>
+    </Dialog>
+  );
+}

ApiCore-Frontend/src/app/(app)/extractions/[id]/page.tsx

@@ -0,0 +1,86 @@
+"use client";
+
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { FlaskConical } from "lucide-react";
+import { useQuery } from "@tanstack/react-query";
+import { fetchExtraction } from "@/lib/extractions/api";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { ExtractionEditDialog } from "./extraction-edit-dialog";
+
+export default function ExtractionDetailPage() {
+  const params = useParams<{ id: string }>();
+  const {
+    data: extraction,
+    isLoading,
+    isError,
+  } = useQuery({
+    queryKey: ["extractions", params.id],
+    queryFn: () => fetchExtraction(params.id),
+  });
+
+  if (isLoading) {
+    return <p className="p-4 text-sm text-muted-foreground sm:p-6">Lädt…</p>;
+  }
+  if (isError || !extraction) {
+    return (
+      <p role="alert" className="p-4 text-sm text-destructive sm:p-6">
+        Schleuderung konnte nicht geladen werden.
+      </p>
+    );
+  }
+
+  return (
+    <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <Card className="max-w-lg">
+        <CardHeader className="flex flex-row items-center justify-between gap-2.5">
+          <div className="flex items-center gap-2.5">
+            <span
+              className="flex size-8 items-center justify-center rounded-lg text-white shadow-[var(--shadow-soft)]"
+              style={{ background: "var(--gradient-honey)" }}
+            >
+              <FlaskConical className="size-4" />
+            </span>
+            <CardTitle>
+              Schleuderung vom {new Date(extraction.date).toLocaleDateString("de-DE")}
+            </CardTitle>
+          </div>
+          <ExtractionEditDialog extraction={extraction} />
+        </CardHeader>
+        <CardContent className="flex flex-col gap-3 text-sm">
+          {extraction.amount !== null ? <p>Menge: {extraction.amount} kg</p> : null}
+          {extraction.room ? <p>Schleuderraum: {extraction.room}</p> : null}
+          {extraction.waterContent !== null ? (
+            <p>Wassergehalt: {extraction.waterContent} %</p>
+          ) : null}
+          {extraction.temperature !== null ? (
+            <p>Temperatur: {extraction.temperature} °C</p>
+          ) : null}
+          {extraction.notes ? <p>Notizen: {extraction.notes}</p> : null}
+          <div>
+            <p className="font-medium">Beteiligte Ernten</p>
+            <ul className="list-disc pl-5">
+              {extraction.harvests.map((entry) => (
+                <li key={entry.id}>
+                  <Link href={`/harvests/${entry.harvestId}`} className="hover:underline">
+                    {new Date(entry.harvest.date).toLocaleDateString("de-DE")} ·{" "}
+                    {entry.harvest.colonies.map((c) => c.colony.code).join(", ")}
+                  </Link>
+                </li>
+              ))}
+            </ul>
+          </div>
+          <Button
+            className="w-fit"
+            variant="outline"
+            nativeButton={false}
+            render={<Link href="/honey-batches" />}
+          >
+            Zu den Honigchargen
+          </Button>
+        </CardContent>
+      </Card>
+    </main>
+  );
+}

ApiCore-Frontend/src/app/(app)/extractions/new/page.tsx

@@ -3,6 +3,7 @@
 import { FormEvent, useState } from "react";
 import { useRouter, useSearchParams } from "next/navigation";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { toast } from "sonner";
 import { Droplet } from "lucide-react";
 import { fetchHarvests } from "@/lib/harvests/api";
 import { createExtraction } from "@/lib/extractions/api";
@@ -37,9 +38,10 @@ export default function NewExtractionPage() {
 
   const mutation = useMutation({
     mutationFn: createExtraction,
-    onSuccess: () => {
+    onSuccess: (extraction) => {
       void queryClient.invalidateQueries({ queryKey: ["extractions"] });
-      router.push("/colonies");
+      toast.success("Schleuderung gespeichert");
+      router.push(`/extractions/${extraction.id}`);
     },
     onError: () => {
       setError("Schleuderung konnte nicht gespeichert werden.");

ApiCore-Frontend/src/app/(app)/extractions/page.tsx

@@ -0,0 +1,77 @@
+"use client";
+
+import Link from "next/link";
+import { FlaskConical } from "lucide-react";
+import { useQuery } from "@tanstack/react-query";
+import { fetchExtractions } from "@/lib/extractions/api";
+import { Button } from "@/components/ui/button";
+import { PageHeader } from "@/components/page-header";
+import { EmptyState } from "@/components/empty-state";
+import { EntityCard } from "@/components/entity-card";
+
+export default function ExtractionsPage() {
+  const {
+    data: extractions,
+    isLoading,
+    isError,
+  } = useQuery({ queryKey: ["extractions"], queryFn: fetchExtractions });
+
+  const sortedExtractions = [...(extractions ?? [])].sort(
+    (a, b) => new Date(b.date).getTime() - new Date(a.date).getTime(),
+  );
+
+  return (
+    <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <PageHeader
+        icon={FlaskConical}
+        title="Schleuderungen"
+        description="Erfasste Schleuderungen aus einer oder mehreren Ernten"
+        actions={
+          <Button nativeButton={false} render={<Link href="/extractions/new" />}>
+            + Neue Schleuderung
+          </Button>
+        }
+      />
+
+      {isLoading ? <p className="text-sm text-muted-foreground">Lädt…</p> : null}
+      {isError ? (
+        <p role="alert" className="text-sm text-destructive">
+          Schleuderungen konnten nicht geladen werden.
+        </p>
+      ) : null}
+
+      {extractions && sortedExtractions.length === 0 ? (
+        <EmptyState
+          icon={FlaskConical}
+          title="Noch keine Schleuderungen"
+          description="Erfasse deine erste Schleuderung aus einer oder mehreren Ernten."
+        />
+      ) : null}
+
+      {sortedExtractions.length > 0 ? (
+        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3">
+          {sortedExtractions.map((extraction) => (
+            <EntityCard
+              key={extraction.id}
+              href={`/extractions/${extraction.id}`}
+              icon={FlaskConical}
+              title={new Date(extraction.date).toLocaleDateString("de-DE")}
+              subtitle={extraction.room ?? "—"}
+              fields={[
+                {
+                  label: "Menge",
+                  value: extraction.amount !== null ? `${extraction.amount} kg` : "—",
+                },
+                {
+                  label: "Wassergehalt",
+                  value: extraction.waterContent !== null ? `${extraction.waterContent} %` : "—",
+                },
+                { label: "Ernten", value: extraction.harvests.length },
+              ]}
+            />
+          ))}
+        </div>
+      ) : null}
+    </main>
+  );
+}

ApiCore-Frontend/src/app/(app)/harvests/page.tsx

@@ -0,0 +1,77 @@
+"use client";
+
+import Link from "next/link";
+import { Scissors } from "lucide-react";
+import { useQuery } from "@tanstack/react-query";
+import { fetchHarvests } from "@/lib/harvests/api";
+import { fetchApiaries } from "@/lib/apiaries/api";
+import { Button } from "@/components/ui/button";
+import { PageHeader } from "@/components/page-header";
+import { EmptyState } from "@/components/empty-state";
+import { EntityCard } from "@/components/entity-card";
+
+export default function HarvestsPage() {
+  const {
+    data: harvests,
+    isLoading,
+    isError,
+  } = useQuery({ queryKey: ["harvests"], queryFn: fetchHarvests });
+  const { data: apiaries } = useQuery({ queryKey: ["apiaries"], queryFn: () => fetchApiaries() });
+
+  const apiaryNameById = new Map((apiaries ?? []).map((apiary) => [apiary.id, apiary.name]));
+  const sortedHarvests = [...(harvests ?? [])].sort(
+    (a, b) => new Date(b.date).getTime() - new Date(a.date).getTime(),
+  );
+
+  return (
+    <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <PageHeader
+        icon={Scissors}
+        title="Ernten"
+        description="Erfasste Ernten je Bienenstand"
+        actions={
+          <Button nativeButton={false} render={<Link href="/harvests/new" />}>
+            + Neue Ernte
+          </Button>
+        }
+      />
+
+      {isLoading ? <p className="text-sm text-muted-foreground">Lädt…</p> : null}
+      {isError ? (
+        <p role="alert" className="text-sm text-destructive">
+          Ernten konnten nicht geladen werden.
+        </p>
+      ) : null}
+
+      {harvests && sortedHarvests.length === 0 ? (
+        <EmptyState
+          icon={Scissors}
+          title="Noch keine Ernten"
+          description="Erfasse deine erste Ernte für einen Bienenstand."
+        />
+      ) : null}
+
+      {sortedHarvests.length > 0 ? (
+        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3">
+          {sortedHarvests.map((harvest) => (
+            <EntityCard
+              key={harvest.id}
+              href={`/harvests/${harvest.id}`}
+              icon={Scissors}
+              title={new Date(harvest.date).toLocaleDateString("de-DE")}
+              subtitle={apiaryNameById.get(harvest.apiaryId) ?? "—"}
+              fields={[
+                { label: "Honigsorte", value: harvest.honeyType ?? "—" },
+                {
+                  label: "Nettogewicht",
+                  value: harvest.netWeight !== null ? `${harvest.netWeight} kg` : "—",
+                },
+                { label: "Völker", value: harvest.colonies.length },
+              ]}
+            />
+          ))}
+        </div>
+      ) : null}
+    </main>
+  );
+}

ApiCore-Frontend/src/app/(app)/sidebar.tsx

@@ -70,8 +70,8 @@ const NAV_GROUPS: NavGroup[] = [
   {
     label: "Ernte & Lager",
     items: [
-      { label: "Ernten", href: "/harvests/new", icon: Scissors },
-      { label: "Schleuderungen", href: "/extractions/new", icon: FlaskConical },
+      { label: "Ernten", href: "/harvests", icon: Scissors },
+      { label: "Schleuderungen", href: "/extractions", icon: FlaskConical },
       { label: "Honigchargen", href: "/honey-batches", icon: Droplet },
       { label: "Abfüllungen", href: "/bottling", icon: Package },
       { label: "Produkte", href: "/products", icon: ShoppingBag },