feat(lib): remove deprecated undefined loading state from value component

libs/ui/src/lib/value/value.component.html

@@ -27,11 +27,7 @@
     }
   </ng-template>
 
-  <!--
-    @deprecated Rendering the loading state for an undefined value is kept for
-    backward compatibility. Use the isLoading attribute instead.
-  -->
-  @if (isLoading() || value === undefined) {
+  @if (isLoading()) {
     <ngx-skeleton-loader
       animation="pulse"
       [theme]="{

libs/ui/src/lib/value/value.component.ts

@@ -47,7 +47,7 @@ export class GfValueComponent implements AfterViewInit, OnChanges, OnDestroy {
   @Input() size: 'large' | 'medium' | 'small' = 'small';
   @Input() subLabel?: string = '';
   @Input() unit?: string | null = '';
-  @Input() value?: number | string | null = '';
+  @Input() value: number | string | null = '';
 
   @ViewChild('labelContent', { static: false })
   labelContent!: ElementRef<HTMLSpanElement>;