Route dialog work directory picker through platform services

src/platform_legacy/legacy_platform_services.cpp

@@ -432,6 +432,25 @@ public:
 #endif
     }
 
+    [[nodiscard]] bool supports_working_directory_picker() override
+    {
+#if defined(__OSX__)
+        return true;
+#else
+        return false;
+#endif
+    }
+
+    [[nodiscard]] std::string format_working_directory_path(std::string_view path) override
+    {
+#if defined(__OSX__)
+        char path_buffer[4096] = {};
+        if (realpath(std::string(path).c_str(), path_buffer))
+            return path_buffer;
+#endif
+        return std::string(path);
+    }
+
     [[nodiscard]] bool uses_prepared_file_writes() override
     {
 #if __IOS__ || __WEB__