Show backround on img tag only when img is loaded

To avoid antializing issue with background
we show background on theparent element of img (.ImageBase)
while img is loading or in case there is no src at all.
But when img is loaded we disable background on .ImageBase
and show background on img itself

packages/vkui/src/components/ImageBase/ImageBase.module.css

@@ -6,13 +6,9 @@
   flex-shrink: 0;
   box-sizing: border-box;
   color: var(--vkui_internal--icon_color, var(--vkui--color_icon_secondary));
+  isolation: isolate;
   background-color: var(--vkui--color_background_secondary);
   background-size: cover;
-  isolation: isolate;
-}
-
-.ImageBase--transparent-background {
-  background-color: transparent;
 }
 
 .ImageBase__border {
@@ -41,6 +37,14 @@
 
 .ImageBase--loaded .ImageBase__img {
   visibility: visible;
+  background-color: var(--vkui--color_background_secondary);
+  background-size: cover;
+}
+
+.ImageBase--transparent-background,
+.ImageBase--transparent-background .ImageBase__img,
+.ImageBase--loaded {
+  background-color: transparent;
 }
 
 .ImageBase__fallback {