fix(Utils): update directory separator handling

- Add support for Linux directory separator in Utils class.
- Ensure compatibility across Windows, Darwin, and Linux OS families.
- Default case now includes the directory separator constant for better cross-platform functionality.

app/Support/Utils.php

@@ -53,7 +53,8 @@ public static function savedPathFor(array $song, ?string $savedDir = null, strin
                     match (\PHP_OS_FAMILY) {
                         'Windows' => ['<', '>', '/', '\\', '|', ':', '"', '?', '*'],
                         'Darwin' => [':'],
-                        default => [],
+                        'Linux' => ['/'],
+                        default => [\DIRECTORY_SEPARATOR],
                     },
                     '',
                 )