fix: ensure proper assignment of default network interface in Proxmox Firewall component by adding checks for network adapter validity

extensions/Servers/Proxmox/Livewire/Firewall.php

@@ -213,7 +213,7 @@ class Firewall extends Component
         }
         
         // Set default interface to first network adapter
-        if (!empty($this->networkAdapters)) {
+        if (!empty($this->networkAdapters) && isset($this->networkAdapters[0]) && isset($this->networkAdapters[0]['name'])) {
             $this->ruleIface = $this->networkAdapters[0]['name'];
         }