feat: Enhance SharePoint web login with retries, timeout, and verification

SharePointFunctions.ps1

@@ -47,18 +47,34 @@ function Connect-SharePoint {
             # Ignore disconnection errors
         }
         
-        # Use Azure Management authentication
-        Connect-PnPOnline -Url $siteUrl -UseWebLogin `
+        # Use web login with additional parameters for stability
+        Connect-PnPOnline -Url $siteUrl `
+            -UseWebLogin `
             -ErrorAction Stop `
-            -WarningAction SilentlyContinue
+            -WarningAction SilentlyContinue `
+            -RetryCount 3 `
+            -RetryWait 3 `
+            -Timeout 300
 
-        # Verify connection
-        $web = Get-PnPWeb -ErrorAction Stop
-        if (-not $web) {
-            throw "Failed to connect to SharePoint site"
+        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
+            }
         }
         
-        return $true
+        throw "Timeout waiting for SharePoint connection"
     }
     catch {
         $script:txtStatus.Text += "Connection Error: $($_.Exception.Message)`n"