fix: always show node border color, widen to 2px on selection

frontend/src/components/canvas/nodes/BaseNode.tsx

@@ -24,7 +24,8 @@ export function BaseNode({ data, selected, icon: Icon }: BaseNodeProps) {
       className="relative flex flex-row items-center gap-2.5 px-2.5 py-2 rounded-lg border transition-all duration-200"
       style={{
         background: colors.background,
-        borderColor: selected ? colors.border : '#30363d',
+        borderColor: colors.border,
+        borderWidth: selected ? 2 : 1,
         boxShadow: isOnline
           ? `0 0 10px ${colors.border}2e, 0 0 3px ${colors.border}1a`
           : selected

frontend/src/components/canvas/nodes/ProxmoxGroupNode.tsx

@@ -38,7 +38,7 @@ export function ProxmoxGroupNode(props: NodeProps<Node<NodeData>>) {
       <div
         className="w-full h-full rounded-xl border-2 flex flex-col overflow-hidden"
         style={{
-          borderColor: selected ? glow : isOnline ? `${glow}66` : '#30363d',
+          borderColor: selected ? glow : `${glow}88`,
           background: isOnline ? `${colors.background}cc` : `${colors.background}aa`,
           boxShadow: isOnline
             ? `0 0 20px ${glow}1a, inset 0 0 40px ${glow}08`