feat(frontend): EmptyState statt Fließtext in verschachtelten Listen

Ersetzt den bisherigen reinen Fließtext ("Noch keine X dokumentiert.")
durch die gemeinsame EmptyState-Komponente (Icon, Titel, Beschreibung)
in allen verschachtelten Listen auf den Volk- und Königin-Detailseiten:
Fütterung, Behandlungen, Varroa, Durchsichten, Historie (Volk und
Königin), Bewertungen und Honigmessungen.

Rundet den bereits umgesetzten EmptyState-Look der Hauptlistenseiten
konsistent auf die Detailseiten-Unterkarten ab.

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

@@ -1,9 +1,11 @@
 "use client";
 
 import Link from "next/link";
+import { Utensils } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColonyFeedings, fetchColonyFeedingsSummary } from "@/lib/feedings/api";
 import { Button } from "@/components/ui/button";
+import { EmptyState } from "@/components/empty-state";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 
 export function ColonyFeedingsCard({ colonyId }: { colonyId: string }) {
@@ -39,7 +41,11 @@ export function ColonyFeedingsCard({ colonyId }: { colonyId: string }) {
         ) : null}
         {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
         {!isLoading && (!feedings || feedings.length === 0) ? (
-          <p className="text-muted-foreground">Noch keine Fütterung dokumentiert.</p>
+          <EmptyState
+            icon={Utensils}
+            title="Noch keine Fütterung"
+            description="Erfasse die erste Fütterung für dieses Volk."
+          />
         ) : null}
         {feedings?.map((feeding) => (
           <div key={feeding.id} className="rounded-md border p-3">

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

@@ -1,7 +1,9 @@
 "use client";
 
+import { History } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColonyHistory } from "@/lib/colonies/api";
+import { EmptyState } from "@/components/empty-state";
 import {
   Card,
   CardContent,
@@ -31,7 +33,11 @@ export function ColonyHistoryCard({ colonyId }: { colonyId: string }) {
       </CardHeader>
       <CardContent className="flex flex-col gap-3 text-sm">
         {!hasHistory ? (
-          <p className="text-muted-foreground">Noch keine Historie vorhanden.</p>
+          <EmptyState
+            icon={History}
+            title="Noch keine Historie"
+            description="Standortwechsel und Ableger erscheinen hier."
+          />
         ) : null}
         {history.apiaryHistory.map((entry) => (
           <p key={entry.id}>

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

@@ -1,9 +1,11 @@
 "use client";
 
 import Link from "next/link";
+import { ClipboardCheck } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColonyInspections } from "@/lib/inspections/api";
 import { Button } from "@/components/ui/button";
+import { EmptyState } from "@/components/empty-state";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 
 export function ColonyInspectionsCard({ colonyId }: { colonyId: string }) {
@@ -27,7 +29,11 @@ export function ColonyInspectionsCard({ colonyId }: { colonyId: string }) {
       <CardContent className="flex flex-col gap-3 text-sm">
         {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
         {!isLoading && (!inspections || inspections.length === 0) ? (
-          <p className="text-muted-foreground">Noch keine Durchsicht dokumentiert.</p>
+          <EmptyState
+            icon={ClipboardCheck}
+            title="Noch keine Durchsicht"
+            description="Dokumentiere die erste Durchsicht für dieses Volk."
+          />
         ) : null}
         {inspections?.map((inspection) => (
           <div key={inspection.id} className="rounded-md border p-3">

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

@@ -1,9 +1,11 @@
 "use client";
 
 import Link from "next/link";
+import { Syringe } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColonyTreatments } from "@/lib/treatments/api";
 import { Button } from "@/components/ui/button";
+import { EmptyState } from "@/components/empty-state";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 
 export function ColonyTreatmentsCard({ colonyId }: { colonyId: string }) {
@@ -27,7 +29,11 @@ export function ColonyTreatmentsCard({ colonyId }: { colonyId: string }) {
       <CardContent className="flex flex-col gap-3 text-sm">
         {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
         {!isLoading && (!treatments || treatments.length === 0) ? (
-          <p className="text-muted-foreground">Noch keine Behandlung dokumentiert.</p>
+          <EmptyState
+            icon={Syringe}
+            title="Noch keine Behandlung"
+            description="Dokumentiere die erste Behandlung für dieses Volk."
+          />
         ) : null}
         {treatments?.map((treatment) => (
           <div key={treatment.id} className="rounded-md border p-3">

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

@@ -1,9 +1,11 @@
 "use client";
 
 import Link from "next/link";
+import { Bug } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
 import { fetchColonyVarroaMeasurements } from "@/lib/varroa/api";
 import { Button } from "@/components/ui/button";
+import { EmptyState } from "@/components/empty-state";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 
 const CHART_WIDTH = 280;
@@ -64,7 +66,11 @@ export function ColonyVarroaCard({ colonyId }: { colonyId: string }) {
       <CardContent className="flex flex-col gap-3 text-sm">
         {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
         {!isLoading && (!measurements || measurements.length === 0) ? (
-          <p className="text-muted-foreground">Noch keine Varroamessung dokumentiert.</p>
+          <EmptyState
+            icon={Bug}
+            title="Noch keine Varroamessung"
+            description="Erfasse die erste Messung für dieses Volk."
+          />
         ) : null}
         <VarroaTrendChart values={values} />
         {measurements?.map((measurement) => (