fix(theme-default): ensure proper sizing of SVG hero images (#4639)

Co-authored-by: Divyansh Singh <[email protected]>

Author: GabrielxDuO

src/client/theme-default/components/VPHero.vue

@@ -322,6 +322,9 @@ const heroImageSlotExists = inject('hero-image-slot-exists') as Ref<boolean>
   left: 50%;
   max-width: 192px;
   max-height: 192px;
+  width: 100%;
+  height: 100%;
+  object-fit: contain;
   /*rtl:ignore*/
   transform: translate(-50%, -50%);
 }