add tileUid to StudentHeader, show Tiles only for selection of 1 student, just allow single selection of Mitarbeiter in MitarbeiterHeader

public/js/components/DetailHeader/DetailHeader.js

@@ -269,7 +269,7 @@ export default {
 					  </h5>
 
 				</div>
-				<div class="col-md-1 d-flex flex-column align-items-end justify-content-start ms-auto">
+				<div v-if="headerData.length == 1" class="col-md-1 d-flex flex-column align-items-end justify-content-start ms-auto">
 					<div class="d-flex py-1">
 						<div class="px-2" style="min-width: 100px;">
 							<slot name="issues"></slot>

public/js/components/Stv/Studentenverwaltung/Details.js

@@ -97,6 +97,7 @@ export default {
 				@reload="reloadList"
 				fotoEditable
 			>
+				<template #uid>{{students[0].uid}}</template>
 				<template #titleAlphaTile>PersID</template>
 				<template #valueAlphaTile>{{tile_PersId}}</template>
 				<template #titleBetaTile>MatrNr</template>

public/js/components/Vertraege/MitarbeiterHeader.js

@@ -66,7 +66,7 @@ export default {
 				persistenceID: 'core-mitarbeiter-2026021701',
 				footerElement: '<div>&sum; <span id="search_count"></span> / <span id="total_count"></span></div>',
 				selectableRowsRangeMode: 'click',
-				selectableRows: true,
+				selectableRows: 1,
 			},
 			tabulatorEvents: [
 				{