Fix Windows path separator issue in handle_imports

Co-authored-by: dd32 <767313+dd32@users.noreply.github.com>

Author: Copilot

class.add-from-server.php

@@ -135,7 +135,7 @@ function handle_imports() {
 			foreach ( (array)$files as $file ) {
 				$filename = trailingslashit( $root ) . ltrim( $file, '/' );
 
-				if ( $filename !== realpath( $filename ) ) {
+				if ( wp_normalize_path( $filename ) !== wp_normalize_path( realpath( $filename ) ) ) {
 					continue;
 				}