fix(label): only thicken border on link hover, not close button (#3104)

Use #container:has(#link:hover) instead of :host(:hover) so the
border only thickens when hovering the link text itself, not when
hovering the close button. Matches PFv4 behavior.

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: 6px;
   text-overflow: ellipsis;
   white-space: nowrap;
   border-width: 0;
@@ -305,15 +306,8 @@ pf-button {
   cursor: pointer;
 }
 
-:host(:hover) #link ~ *,
-:host(:focus-within) #link ~ *,
-#link:hover,
-#link:focus {
-  cursor: pointer;
-}
-
-:host(:hover) #container:has(#link)::before,
-:host(:focus-within) #container:has(#link)::before {
+#container:has(#link:hover)::before,
+#container:has(#link:focus)::before {
   border-width: var(--pf-c-label__content--link--hover--before--BorderWidth, 2px);
   border-color: var(--_label-link-hover-border-color);
 }