refactor: Replace Import-Module with dot-sourcing in PowerShell scripts

MainForm.ps1

@@ -5,8 +5,7 @@ Import-Module Microsoft.Graph.Files
 
 # Import our components
 . "$PSScriptRoot\GraphConfig.ps1"
-$SharePointFunctions = "$PSScriptRoot\SharePointFunctions.ps1"
-Import-Module $SharePointFunctions -Force
+. "$PSScriptRoot\SharePointFunctions.ps1"
 . "$PSScriptRoot\EventHandlers.ps1"
 
 # Create main form

SharePointFunctions.ps1

@@ -2,17 +2,6 @@
 
 $script:config = $null  # Initialize config variable
 
-# Export functions that will be called from other scripts
-Export-ModuleMember -Function @(
-    'Load-Config',
-    'Save-Config',
-    'Get-FolderBrowser',
-    'Connect-SharePoint',
-    'List-XlsFiles',
-    'Convert-Files',
-    'Move-Files'
-)
-
 # Load configuration from config.json
 function Load-Config {
     try {