fix(label): use overflow clip to avoid cutting off focus outlines

Replace overflow: hidden with overflow: clip and overflow-clip-margin
so focus outlines on the close button are not clipped.

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

elements/pf-label/pf-label.css

@@ -20,7 +20,8 @@ pf-icon, ::slotted(pf-icon) {
 }
 
 #container {
-  overflow: hidden;
+  overflow: clip;
+  overflow-clip-margin: 3px;
   text-overflow: ellipsis;
   white-space: nowrap;
   border-width: 0;