feat(frontend): QR-Code-Dialog auf Objekt-Detailseiten (Modul 22)

Wiederverwendbarer QrCodeDialog (authentifizierter Blob-Fetch)
auf Volk-, Bienenstand-, Koenigin-, Honigcharge-Detailseiten und
je Lagerbehaelter-Zeile eingebunden.

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

@@ -4,6 +4,7 @@ import Link from "next/link";
 import { useParams } from "next/navigation";
 import { useQuery } from "@tanstack/react-query";
 import { fetchApiary } from "@/lib/apiaries/api";
+import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { Button } from "@/components/ui/button";
 import { ApiaryEditCard } from "./apiary-edit-card";
 
@@ -27,6 +28,9 @@ export default function ApiaryDetailPage() {
 
   return (
     <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <div className="flex justify-end">
+        <QrCodeDialog entityType="apiaries" id={apiary.id} />
+      </div>
       <ApiaryEditCard key={apiary.id} apiary={apiary} />
       <Button
         className="w-fit"

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

@@ -3,6 +3,7 @@
 import { useParams } from "next/navigation";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColony } from "@/lib/colonies/api";
+import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { ColonyEditCard } from "./colony-edit-card";
 import { ColonyActions } from "./colony-actions";
 import { ColonyHistoryCard } from "./colony-history";
@@ -31,6 +32,9 @@ export default function ColonyDetailPage() {
 
   return (
     <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <div className="flex justify-end">
+        <QrCodeDialog entityType="colonies" id={colony.id} label="QR-Code für Durchsicht" />
+      </div>
       <ColonyEditCard key={colony.id} colony={colony} />
       <ColonyActions colony={colony} />
       <ColonyInspectionsCard colonyId={colony.id} />

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

@@ -4,6 +4,7 @@ import { useParams } from "next/navigation";
 import { useMutation, useQuery } from "@tanstack/react-query";
 import { fetchHoneyBatch, fetchHoneyBatchTraceability } from "@/lib/honey-batches/api";
 import { exportHoneyBatchTraceabilityPdf } from "@/lib/export/api";
+import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
@@ -40,7 +41,10 @@ export default function HoneyBatchDetailPage() {
       <Card className="max-w-lg">
         <CardHeader className="flex flex-row items-center justify-between">
           <CardTitle>{honeyBatch.batchNumber}</CardTitle>
-          <Badge>{honeyBatch.status}</Badge>
+          <div className="flex items-center gap-2">
+            <Badge>{honeyBatch.status}</Badge>
+            <QrCodeDialog entityType="honey-batches" id={honeyBatch.id} />
+          </div>
         </CardHeader>
         <CardContent className="flex flex-col gap-3 text-sm">
           {honeyBatch.honeyType ? <p>Sorte: {honeyBatch.honeyType}</p> : null}

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

@@ -3,6 +3,7 @@
 import { useParams } from "next/navigation";
 import { useQuery } from "@tanstack/react-query";
 import { fetchQueen } from "@/lib/queens/api";
+import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { QueenEditCard } from "./queen-edit-card";
 import { AssignColonyDialog } from "./assign-colony-dialog";
 import { QueenHistoryCard } from "./queen-history";
@@ -27,6 +28,9 @@ export default function QueenDetailPage() {
 
   return (
     <main className="flex flex-col gap-4 p-4 sm:p-6">
+      <div className="flex justify-end">
+        <QrCodeDialog entityType="queens" id={queen.id} />
+      </div>
       <QueenEditCard key={queen.id} queen={queen} />
       <AssignColonyDialog queenId={queen.id} />
       <QueenHistoryCard queenId={queen.id} />

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

@@ -2,6 +2,7 @@
 
 import { useQuery } from "@tanstack/react-query";
 import { fetchStockItems, fetchStorageContainers } from "@/lib/storage/api";
+import { QrCodeDialog } from "@/components/qr-code-dialog";
 import { Badge } from "@/components/ui/badge";
 import {
   Table,
@@ -41,12 +42,13 @@ export default function StoragePage() {
                 <TableHead>Typ</TableHead>
                 <TableHead>Standort</TableHead>
                 <TableHead>Status</TableHead>
+                <TableHead className="text-right">QR-Code</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
               {containers.map((container) => (
                 <TableRow key={container.id}>
-                  <TableCell>{container.code}</TableCell>
+                  <TableCell className="font-mono font-medium">{container.code}</TableCell>
                   <TableCell>{container.containerType ?? "—"}</TableCell>
                   <TableCell>{container.location ?? "—"}</TableCell>
                   <TableCell>
@@ -54,6 +56,9 @@ export default function StoragePage() {
                       {container.status}
                     </Badge>
                   </TableCell>
+                  <TableCell className="text-right">
+                    <QrCodeDialog entityType="storage-containers" id={container.id} label="QR" />
+                  </TableCell>
                 </TableRow>
               ))}
             </TableBody>

ApiCore-Frontend/src/components/qr-code-dialog.tsx

@@ -0,0 +1,65 @@
+"use client";
+
+import { useEffect, useMemo, useState } from "react";
+import { useQuery } from "@tanstack/react-query";
+import { QrCode } from "lucide-react";
+import { fetchQrCodeSvg, QrEntityType } from "@/lib/qr/api";
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogTrigger,
+} from "@/components/ui/dialog";
+
+interface QrCodeDialogProps {
+  entityType: QrEntityType;
+  id: string;
+  label?: string;
+}
+
+export function QrCodeDialog({ entityType, id, label = "QR-Code" }: QrCodeDialogProps) {
+  const [open, setOpen] = useState(false);
+
+  const { data: blob, isLoading, isError } = useQuery({
+    queryKey: ["qr", entityType, id],
+    queryFn: () => fetchQrCodeSvg(entityType, id),
+    enabled: open,
+  });
+
+  const objectUrl = useMemo(() => (blob ? URL.createObjectURL(blob) : null), [blob]);
+  useEffect(() => {
+    return () => {
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+    };
+  }, [objectUrl]);
+
+  return (
+    <Dialog open={open} onOpenChange={setOpen}>
+      <DialogTrigger
+        render={
+          <Button variant="outline" size="sm">
+            <QrCode className="size-4" />
+            {label}
+          </Button>
+        }
+      />
+      <DialogContent className="flex flex-col items-center gap-4">
+        <DialogHeader>
+          <DialogTitle>{label}</DialogTitle>
+        </DialogHeader>
+        {isLoading ? <p className="text-sm text-muted-foreground">Lädt…</p> : null}
+        {isError ? (
+          <p role="alert" className="text-sm text-destructive">
+            QR-Code konnte nicht geladen werden.
+          </p>
+        ) : null}
+        {objectUrl ? (
+          // eslint-disable-next-line @next/next/no-img-element -- blob: object URL, next/image cannot handle this
+          <img src={objectUrl} alt="QR-Code" className="size-64 rounded-lg border bg-white p-3" />
+        ) : null}
+      </DialogContent>
+    </Dialog>
+  );
+}

ApiCore-Frontend/src/lib/qr/api.ts

@@ -0,0 +1,13 @@
+import { apiFetchBlob } from "@/lib/auth/api-client";
+
+export type QrEntityType =
+  | "colonies"
+  | "apiaries"
+  | "queens"
+  | "honey-batches"
+  | "storage-containers";
+
+export async function fetchQrCodeSvg(entityType: QrEntityType, id: string): Promise<Blob> {
+  const { blob } = await apiFetchBlob(`/qr/${entityType}/${id}.svg`, `${entityType}.svg`);
+  return blob;
+}