feat: use blurHash when loading list backgrounds (#1188)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/1188

src/models/backgroundImage.js

@@ -7,6 +7,7 @@ export default class BackgroundImageModel extends AbstractModel {
 			url: '',
 			thumb: '',
 			info: {},
+			blurHash: '',
 		}
 	}
 }

src/models/list.js

@@ -20,7 +20,7 @@ export default class ListModel extends AbstractModel {
 
 		this.owner = new UserModel(this.owner)
 
-		if(typeof this.subscription !== 'undefined' && this.subscription !== null) {
+		if (typeof this.subscription !== 'undefined' && this.subscription !== null) {
 			this.subscription = new SubscriptionModel(this.subscription)
 		}
 
@@ -44,6 +44,7 @@ export default class ListModel extends AbstractModel {
 			isFavorite: false,
 			subscription: null,
 			position: 0,
+			backgroundBlurHash: '',
 
 			created: null,
 			updated: null,