fix: fluent variant focus ring cut for collapsible inside group

Author: OEvgeny

__tests__/html2/part-grouping/fluent.dark.html.snap-8.png

@@ -313,7 +313,7 @@
   }
 
   &.part-grouping-decorator--group  :global(.stacked-layout .webchat__bubble .collapsible-content .collapsible-content__content) {
-    margin-block: var(--webchat-spacingVerticalNone);
+    margin-block: var(--webchat__bubble--block-padding) var(--webchat-spacingVerticalNone);
   }
 }
 
@@ -359,6 +359,11 @@
     min-height: var(--webchat__bubble--min-height);
   }
 
+  &.part-grouping-decorator--group :global(.webchat__bubble .webchat__bubble__content) {
+    margin-block: calc(var(--webchat-spacingVerticalS) * -1);
+    padding-block: var(--webchat-spacingVerticalS);
+  }
+
   &:where(:not(.part-grouping-decorator--group).part-grouping-decorator--from-bot) :global(.webchat__bubble .webchat__bubble__content) {
     background-color: var(--webchat__bubble--background-color);
     border-radius: var(--webchat__bubble--border-radius);