add direct invitation link

src/app/admin/directInvitations/SidebarActions.svelte

@@ -0,0 +1,32 @@
+<script lang="ts">
+  import Icon from '@iconify/svelte';
+  import CrudPopup from '@components/admin/popup/CrudPopup.svelte';
+  import { addDirectInvitation, fetchDirectInvitations } from '@app/admin/directInvitations/directInvitations.ts';
+
+  // states
+  let createPopupOpen = $state(false);
+
+  // lifecycle
+  $effect(() => {
+    fetchDirectInvitations();
+  });
+</script>
+
+<div>
+  <button class="btn btn-soft w-full" onclick={() => (createPopupOpen = true)}>
+    <Icon icon="heroicons:plus-16-solid" />
+    <span>Neue direkte Einladung</span>
+  </button>
+</div>
+
+<CrudPopup
+  texts={{
+    title: 'Direkte Einladung erstellen',
+    submitButtonTitle: 'Erstellen',
+    confirmPopupTitle: 'Direkte Einladung erstellen',
+    confirmPopupMessage: 'Bist du sicher, dass die direkte Einladung erstellt werden soll?.'
+  }}
+  target={null}
+  onSubmit={addDirectInvitation}
+  bind:open={createPopupOpen}
+/>