refactor: Migrate from PnP to Microsoft Graph authentication

GraphConfig.ps1

@@ -0,0 +1,29 @@
+# App registration details
+$script:graphConfig = @{
+    ClientId     = "YOUR_CLIENT_ID" # Replace with your app registration client ID
+    TenantId     = "YOUR_TENANT_ID" # Replace with your tenant ID
+    Scopes       = @(
+        "Files.ReadWrite.All"
+        "Sites.ReadWrite.All"
+    )
+}
+
+function Connect-Graph {
+    try {
+        Connect-MgGraph -ClientId $graphConfig.ClientId `
+            -TenantId $graphConfig.TenantId `
+            -Scopes $graphConfig.Scopes `
+            -UseDeviceCode
+        
+        # Verify connection
+        $profile = Get-MgProfile
+        if ($profile) {
+            return $true
+        }
+        return $false
+    }
+    catch {
+        $script:txtStatus.Text += "Graph Connection Error: $($_.Exception.Message)`n"
+        return $false
+    }
+}

MainForm.ps1

@@ -1,7 +1,9 @@
 Add-Type -AssemblyName System.Windows.Forms
-Import-Module PnP.PowerShell
+Import-Module Microsoft.Graph.Sites
+Import-Module Microsoft.Graph.Files
 
 # Import our components
+. "$PSScriptRoot\GraphConfig.ps1"
 . "$PSScriptRoot\SharePointFunctions.ps1"
 . "$PSScriptRoot\EventHandlers.ps1"
 

SharePointFunctions.ps1

@@ -32,51 +32,7 @@ function Save-Config {
 }
 
 function Connect-SharePoint {
-    try {
-        $siteUrl = $script:txtSiteUrl.Text
-        
-        if (-not $siteUrl) {
-            throw "Please enter a Site URL"
-        }
-
-        # Try to disconnect, but ignore any errors
-        try {
-            Disconnect-PnPOnline
-        }
-        catch {
-            # Ignore disconnection errors
-        }
-        
-        # Use web login with simplified parameters
-        Connect-PnPOnline -Url $siteUrl `
-            -UseWebLogin `
-            -ErrorAction Stop `
-            -WarningAction SilentlyContinue
-
-        Start-Sleep -Seconds 2  # Give the web login time to complete
-        
-        # Verify connection with timeout
-        $timeoutSeconds = 30
-        $startTime = Get-Date
-        while ((Get-Date) -lt $startTime.AddSeconds($timeoutSeconds)) {
-            try {
-                $web = Get-PnPWeb -ErrorAction Stop
-                if ($web) {
-                    return $true
-                }
-            }
-            catch {
-                Start-Sleep -Seconds 2
-                continue
-            }
-        }
-        
-        throw "Timeout waiting for SharePoint connection"
-    }
-    catch {
-        $script:txtStatus.Text += "Connection Error: $($_.Exception.Message)`n"
-        return $false
-    }
+    return Connect-Graph
 }
 
 function List-XlsFiles {