feat: add v-shortcut directive for keyboard shortcuts (#942)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/942
Reviewed-by: dpschen <dpschen@noreply.kolaente.de>
Co-authored-by: konrad <k@knt.li>
Co-committed-by: konrad <k@knt.li>

src/components/modal/modal.vue

@@ -12,8 +12,7 @@
 				class="modal-container"
 				:class="{'has-overflow': overflow}"
 				@click.self.prevent.stop="$emit('close')"
-				@shortkey="$emit('close')"
-				v-shortkey="['esc']"
+				v-shortcut="'Escape'"
 			>
 				<div
 					class="modal-content"