fix: add legacy showIconModal property to prevent stale session errors

Users with cached Livewire state from before rollback were getting errors
because their browser was trying to set showIconModal which no longer existed.
Adding an empty property prevents these errors until they refresh.

extensions/Servers/Proxmox/Livewire/Overview.php

@@ -22,6 +22,9 @@ class Overview extends Component
     public $isEditingPassword = false;
     public $passwordError = '';
 
+    // Legacy property - kept to prevent errors for users with stale Livewire state
+    public bool $showIconModal = false;
+
     public string $cpuTimeRange = 'hour';
     public string $cpuAggregation = 'average';