fix: Improve SharePoint connection handling and folder browser reliability

MainForm.ps1

@@ -66,12 +66,26 @@ $txtStatus.Size = New-Object System.Drawing.Size(540,240)
 $txtStatus.Multiline = $true
 $txtStatus.ScrollBars = "Vertical"
 $form.Controls.Add($txtStatus)
+# Add Save Config button
+$btnSaveConfig = New-Object System.Windows.Forms.Button
+$btnSaveConfig.Location = New-Object System.Drawing.Point(230,40)
+$btnSaveConfig.Size = New-Object System.Drawing.Size(80,20)
+$btnSaveConfig.Text = "Save Config"
+$btnSaveConfig.Add_Click({
+    Save-Config -SiteUrl $txtSiteUrl.Text `
+                -ProductionLibrary $txtProdLib.Text `
+                -TempLibrary $txtTempLib.Text `
+                -ClientId $config.ClientId `
+                -ClientSecret $config.ClientSecret
+})
+
 $form.Controls.AddRange(@(
     $txtSiteUrl,
     $txtProdLib,
     $txtTempLib,
     $txtFolder,
-    $btnBrowse
+    $btnBrowse,
+    $btnSaveConfig
 ))
 
 # Load configuration
@@ -89,10 +103,21 @@ $btnList.Add_Click({ List-XlsFiles })
 $btnConvert.Add_Click({ Convert-Files })
 $btnMove.Add_Click({ Move-Files })
 $btnBrowse.Add_Click({
-    $selectedFolder = Get-FolderBrowser -context (Get-PnPConnection)
-    if ($selectedFolder) {
-        $relativePath = $selectedFolder.ServerRelativeUrl -replace [regex]::Escape((Get-PnPWeb).ServerRelativeUrl), ""
-        $script:txtFolder.Text = $relativePath.Trim('/')
+    try {
+        if (-not (Connect-SharePoint)) {
+            [System.Windows.Forms.MessageBox]::Show("Please configure and connect to SharePoint first!")
+            return
+        }
+        
+        $selectedFolder = Get-FolderBrowser
+        if ($selectedFolder) {
+            $webUrl = (Get-PnPWeb).ServerRelativeUrl
+            $relativePath = $selectedFolder.ServerRelativeUrl -replace [regex]::Escape($webUrl), ""
+            $script:txtFolder.Text = $relativePath.Trim('/')
+        }
+    }
+    catch {
+        $script:txtStatus.Text += "Folder browse error: $_`n"
     }
 })
 

SharePointFunctions.ps1

@@ -37,7 +37,16 @@ function Save-Config {
 
 function Connect-SharePoint {
     try {
-        Connect-PnPOnline -Url $config.SiteUrl -ClientId $config.ClientId -ClientSecret $config.ClientSecret
+        # Use current form values instead of saved config
+        $siteUrl = $script:txtSiteUrl.Text
+        $clientId = $config.ClientId
+        $clientSecret = $config.ClientSecret
+        
+        if (-not $siteUrl) {
+            throw "Please enter a Site URL"
+        }
+        
+        Connect-PnPOnline -Url $siteUrl -ClientId $clientId -ClientSecret $clientSecret -WarningAction SilentlyContinue
         return $true
     }
     catch {
@@ -69,7 +78,7 @@ function List-XlsFiles {
     foreach ($item in $items) {
         $fileList += [PSCustomObject]@{
             OriginalPath = $item.FieldValues.FileRef
-            TempPath = "$tempLibrary/$($item.FieldValues.FileLeafRef)"
+            TempPath = "$($script:txtTempLib.Text)/$($item.FieldValues.FileLeafRef)"
         }
     }
     
@@ -124,18 +133,27 @@ function Move-Files {
 function Get-FolderBrowser {
     param($context)
     try {
-        $folder = Get-PnPFolder -Url $script:txtProdLib.Text
-        $ctx = $context
-        $folders = @()
+        if (-not (Connect-SharePoint)) {
+            return $null
+        }
         
-        $fld = $ctx.Web.GetFolderByServerRelativePath($folder.ServerRelativeUrl)
-        $ctx.Load($fld.Folders)
-        $ctx.ExecuteQuery()
+        $libraryName = $script:txtProdLib.Text
+        if (-not $libraryName) {
+            throw "Production Library name is required"
+        }
         
-        $folders += $fld.Folders | Select-Object Name, ServerRelativeUrl
-        return $folders | Out-GridView -Title "Select Folder" -PassThru
+        $ctx = Get-PnPConnection
+        $web = Get-PnPWeb
+        $library = Get-PnPList -Identity $libraryName
+        
+        $folders = Get-PnPFolder -Url $library.RootFolder.ServerRelativeUrl -Includes Folders | 
+            Select-Object -ExpandProperty Folders |
+            Select-Object Name, ServerRelativeUrl
+            
+        return $folders | Out-GridView -Title "Select Folder (Double-click to select)" -PassThru
     }
     catch {
         $script:txtStatus.Text += "Error browsing folders: $_`n"
+        return $null
     }
 }