have world_writable_warning_details accept cwd as a param (#6913)

this enables app-server to pass in the correct workspace cwd for the
current conversation

codex-rs/app-server/src/message_processor.rs

@@ -191,8 +191,15 @@ impl MessageProcessor {
         }
 
         // This function is stubbed out to return None on non-Windows platforms
+        let cwd = match std::env::current_dir() {
+            Ok(cwd) => cwd,
+            Err(_) => return,
+        };
         if let Some((sample_paths, extra_count, failed_scan)) =
-            codex_windows_sandbox::world_writable_warning_details(self.config.codex_home.as_path())
+            codex_windows_sandbox::world_writable_warning_details(
+                self.config.codex_home.as_path(),
+                cwd,
+            )
         {
             self.outgoing
                 .send_server_notification(ServerNotification::WindowsWorldWritableWarning(