Resolve "Add export functionality to course book"

Closes #258 (closed)

aleksis/apps/alsijil/frontend/components/coursebook/statistics/StatisticsAbsencesCard.vue

+<template>
+  <v-skeleton-loader v-if="loading" type="card" />
+  <v-card v-else>
+    <v-card-text class="d-flex flex-column" style="gap: 0.5em">
+      <absence-reason-chip
+        v-for="absenceReason in absenceReasons"
+        :key="absenceReason.id"
+        :absenceReason="absenceReason.absenceReason"
+        :count="absenceReason.count"
+      />
+    </v-card-text>
+  </v-card>
+</template>
+
+<script>
+import AbsenceReasonChip from "aleksis.apps.kolego/components/AbsenceReasonChip.vue";
+
+export default {
+  name: "StatisticsAbsencesCard",
+  components: {
+    AbsenceReasonChip,
+  },
+  props: {
+    absenceReasons: {
+      type: Array,
+      required: true,
+    },
+    loading: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+};
+</script>