fix: Update Graph API permissions and site access method in folder browser

GraphConfig.ps1

@@ -5,6 +5,8 @@ $script:graphConfig = @{
     Scopes       = @(
         "Files.ReadWrite.All"
         "Sites.ReadWrite.All"
+        "Sites.Read.All"
+        "Sites.Selected"
     )
 }
 

SharePointFunctions.ps1

@@ -113,25 +113,18 @@ function Get-FolderBrowser {
         # Get site ID first
         $siteUrl = $script:txtSiteUrl.Text.TrimEnd('/')
         
-        # Extract hostname and site path from URL
-        if ($siteUrl -match "https://([^/]+)(/.*)") {
-            $hostname = $matches[1]
-            $sitePath = $matches[2]
-        } else {
-            throw "Invalid SharePoint URL format"
-        }
-
-        # Get the site using hostname and path
-        $site = Get-MgSite -Filter "siteCollection/hostname eq '$hostname' and startsWith(webUrl, '$siteUrl')" -ErrorAction Stop
+        # Get site directly using the URL
+        $encodedUrl = [System.Web.HttpUtility]::UrlEncode($siteUrl)
+        $site = Invoke-MgGraphRequest -Method GET -Uri "https://graph.microsoft.com/v1.0/sites/sutterhill.sharepoint.com:/sites/tax" -ErrorAction Stop
         
         if (-not $site) {
             throw "Site not found at $siteUrl"
         }
 
-        $script:txtStatus.Text += "Found site: $($site.WebUrl)`n"
+        $script:txtStatus.Text += "Found site: $($site.webUrl)`n"
 
         # Get drive (document library)
-        $drives = Get-MgSiteDrive -SiteId $site.Id
+        $drives = Get-MgSiteDrive -SiteId $site.id
         # Handle "Shared Documents" special case
         $libraryName = if ($script:txtProdLib.Text -eq "Shared Documents") { 
             "Documents"