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frontend/src/components/ChartCard.vue

+<template>
+    <div class="chart-card">
+      <h3>{{ title }}</h3>
+      <Line :data="chartData" :options="chartOptions" />
+    </div>
+  </template>
+  
+  <script lang="ts">
+  import { defineComponent } from 'vue';
+  import type { PropType } from 'vue';
+  
+  import {
+    Chart as ChartJS,
+    Title,
+    Tooltip,
+    Legend,
+    LineElement,
+    PointElement,
+    CategoryScale,
+    LinearScale
+  } from 'chart.js';
+  import { Line } from 'vue-chartjs';
+  import type { ChartData, ChartOptions } from 'chart.js';
+  
+  // ⛳️ WICHTIG: Registrierung außerhalb von defineComponent
+  ChartJS.register(
+    Title,
+    Tooltip,
+    Legend,
+    LineElement,
+    PointElement,
+    CategoryScale,
+    LinearScale
+  );
+  
+  export default defineComponent({
+    name: 'ChartCard',
+    components: {
+      Line
+    },
+    props: {
+      title: {
+        type: String,
+        required: true
+      },
+      labels: {
+        type: Array as PropType<string[]>,
+        required: true
+      },
+      data: {
+        type: Array as PropType<number[]>,
+        required: true
+      },
+      borderColor: {
+        type: String,
+        required: true
+      }
+    },
+    computed: {
+      chartData(): ChartData<'line'> {
+        return {
+          labels: this.labels,
+          datasets: [
+            {
+              label: this.title,
+              data: this.data,
+              fill: false,
+              borderColor: this.borderColor,
+              tension: 0.3
+            }
+          ]
+        };
+      },
+      chartOptions(): ChartOptions<'line'> {
+        return {
+          responsive: true,
+          maintainAspectRatio: false,
+          scales: {
+            y: {
+              beginAtZero: true
+            }
+          }
+        };
+      }
+    }
+  });
+  </script>
+  
+  <style scoped>
+  .chart-card {
+    width: 300px;
+    height: 250px;
+    background: white;
+    padding: 1rem;
+    border-radius: 8px;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  }
+  .chart-card h3 {
+    text-align: center;
+    margin-bottom: 0.5rem;
+    font-size: 1rem;
+  }
+  </style>
+  
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