Fix offline mode (#4153)

* Fix usb error on drive with no existing partitions

* fix offline mode

* Add offline banner

functions/private/Test-WinUtilInternetConnection.ps1

@@ -1,26 +0,0 @@
-function Test-WinUtilInternetConnection {
-    <#
-    .SYNOPSIS
-        Tests if the computer has internet connectivity
-    .OUTPUTS
-        Boolean - True if connected, False if offline
-    #>
-    try {
-        # Test multiple reliable endpoints
-        $testSites = @(
-            "8.8.8.8",           # Google DNS
-            "1.1.1.1",           # Cloudflare DNS
-            "208.67.222.222"     # OpenDNS
-        )
-
-        foreach ($site in $testSites) {
-            if (Test-Connection -ComputerName $site -Count 1 -Quiet -ErrorAction SilentlyContinue) {
-                return $true
-            }
-        }
-        return $false
-    }
-    catch {
-        return $false
-    }
-}