feat: Add explicit Connect button and streamline SharePoint connection

MainForm.ps1

@@ -77,13 +77,25 @@ $btnSaveConfig.Add_Click({
                 -TempLibrary $txtTempLib.Text
 })
 
+# Add Connect button
+$btnConnect = New-Object System.Windows.Forms.Button
+$btnConnect.Location = New-Object System.Drawing.Point(320,40)
+$btnConnect.Size = New-Object System.Drawing.Size(80,20)
+$btnConnect.Text = "Connect"
+$btnConnect.Add_Click({
+    if (Connect-SharePoint) {
+        $script:txtStatus.Text += "Successfully connected to SharePoint`n"
+    }
+})
+
 $form.Controls.AddRange(@(
     $txtSiteUrl,
     $txtProdLib,
     $txtTempLib,
     $txtFolder,
     $btnBrowse,
-    $btnSaveConfig
+    $btnSaveConfig,
+    $btnConnect
 ))
 
 # Load configuration

SharePointFunctions.ps1

@@ -130,10 +130,6 @@ function Move-Files {
 }
 function Get-FolderBrowser {
     try {
-        if (-not (Connect-SharePoint)) {
-            return $null
-        }
-        
         # Verify library exists and is accessible
         $library = Get-PnPList -Identity $script:txtProdLib.Text -Includes RootFolder,HasUniqueRoleAssignments
         if ($library.HasUniqueRoleAssignments) {