fix(frontend/card): Fix blue oval showing if card doesn't exist

frontend/src/app/card/card.component.html

@@ -1,4 +1,5 @@
-<div class="card" [class.small]="small" [class.selected]="selected">
+@if (card.id != 0) {
+  <div class="card" [class.small]="small" [class.selected]="selected">
     @for (i of parseCount(); track i) {
       <img 
         [width]="shapeWidth"
@@ -7,4 +8,7 @@
         draggable="false"
       >
     }
-</div>
+  </div>
+} @else {
+  <div class="card" style="border: 0px; background: transparent;"></div>
+}