refactor(php-shim): use std::path::MAIN_SEPARATOR over a shim constant

The shim's DIRECTORY_SEPARATOR was hardcoded to "/", so every ported
`'\\' === DIRECTORY_SEPARATOR` check compared against a constant that
does not track the target platform. std::path::MAIN_SEPARATOR and
MAIN_SEPARATOR_STR carry the same meaning as PHP's constant and resolve
per platform, so the Windows branches are selected on Windows targets.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/filesystem/filesystem.rs b/crates/shirabe-external-packages/src/symfony/filesystem/filesystem.rs
index 8834f724..0aba97fb 100644
--- a/crates/shirabe-external-packages/src/symfony/filesystem/filesystem.rs
+++ b/crates/shirabe-external-packages/src/symfony/filesystem/filesystem.rs
@@ -201,7 +201,7 @@ impl Filesystem {
             if shirabe_php_shim::is_link(&file) {
                 // See https://bugs.php.net/52176
                 if !(shirabe_php_shim::unlink(&file)
-                    || shirabe_php_shim::DIRECTORY_SEPARATOR != "\\"
+                    || std::path::MAIN_SEPARATOR != '\\'
                     || shirabe_php_shim::rmdir(&file))
                     && shirabe_php_shim::file_exists(&file)
                 {
@@ -272,7 +272,7 @@ impl Filesystem {
         let mut origin_dir = origin_dir.to_string();
         let mut target_dir = target_dir.to_string();
 
-        if shirabe_php_shim::DIRECTORY_SEPARATOR == "\\" {
+        if std::path::MAIN_SEPARATOR == '\\' {
             origin_dir = shirabe_php_shim::strtr(&origin_dir, "/", "\\");
             target_dir = shirabe_php_shim::strtr(&target_dir, "/", "\\");