Fix Keycloak diagnostics showing green connectors when not connected

Connector lines between steps were green for skipped checks, making it
look like the chain succeeded even with no connection.

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

frontend/src/pages/admin.tsx

@@ -230,7 +230,7 @@ function KeycloakDiagnosticsSection() {
                   <div
                     className={cn(
                       "mx-1 mt-[23px] h-0.5 w-8 self-start sm:w-12",
-                      isOk || isSkipped ? "bg-emerald-400" : "bg-border"
+                      isOk ? "bg-emerald-400" : "bg-border"
                     )}
                   />
                 )}