fix: add retry and show warning on description saving error

Signed-off-by: Luka Trovic <luka@nextcloud.com>

[skip ci]

src/components/card/CardSidebar.vue

@@ -96,7 +96,7 @@ import HomeIcon from 'vue-material-design-icons/Home.vue'
 import CommentIcon from 'vue-material-design-icons/Comment.vue'
 import ActivityIcon from 'vue-material-design-icons/LightningBolt.vue'
 
-import { showError } from '@nextcloud/dialogs'
+import { showError, showWarning } from '@nextcloud/dialogs'
 import { getLocale } from '@nextcloud/l10n'
 import CardMenuEntries from '../cards/CardMenuEntries.vue'
 
@@ -190,6 +190,10 @@ export default {
 		},
 
 		closeSidebar() {
+			if (this.hasCardSaveError) {
+				showWarning(t('deck', 'Cannot close unsaved card!'))
+				return
+			}
 			this.$router?.push({ name: 'board' })
 			this.$emit('close')
 		},