fix: fetch all groups via -AllPages for large tenants

Replaces default 100-item page limits and =999 workarounds
with -AllPages on group queries across assignment and baseline scripts.
Enables full fzf inline search/filter for group selection.

Scripts/Backup-Restore-Assignments.ps1

@@ -277,9 +277,9 @@ if($Mode -eq "Backup")
 
     # Preload groups for name resolution in backup
     Write-Host "`nLoading groups for backup resolution..." -ForegroundColor Cyan
-    $backupGroupsResponse = Invoke-GraphRequest "/groups?`$select=id,displayName&`$top=999"
+    $backupGroupsResponse = Invoke-GraphRequest "/groups?`$select=id,displayName&`$orderby=displayName" -AllPages
     $backupGroups = @{}
-    foreach($g in $backupGroupsResponse.value)
+    foreach($g in $backupGroupsResponse)
     {
         $backupGroups[$g.id] = $g.displayName
     }
@@ -382,8 +382,8 @@ elseif($Mode -eq "Restore")
 
     # Resolve group names to IDs in current tenant if needed
     Write-Host "`nLoading current tenant groups for name resolution..." -ForegroundColor Cyan
-    $currentGroupsResponse = Invoke-GraphRequest "/groups?`$select=id,displayName&`$top=999"
-    $currentGroups = $currentGroupsResponse.value
+    $currentGroupsResponse = Invoke-GraphRequest "/groups?`$select=id,displayName&`$orderby=displayName" -AllPages
+    $currentGroups = $currentGroupsResponse
 
     $success = 0
     $skipped = 0