Route dialog work directory picker through platform services

src/platform_windows/windows_platform_services.cpp

@@ -449,6 +449,24 @@ public:
         invoke_selected_path(path, callback);
     }
 
+    [[nodiscard]] bool supports_working_directory_picker() override
+    {
+        return true;
+    }
+
+    [[nodiscard]] std::string format_working_directory_path(std::string_view path) override
+    {
+        char path_buffer[MAX_PATH] = {};
+        const auto length = GetFullPathNameA(
+            std::string(path).c_str(),
+            static_cast<DWORD>(sizeof(path_buffer)),
+            path_buffer,
+            nullptr);
+        if (length > 0 && length < sizeof(path_buffer))
+            return path_buffer;
+        return std::string(path);
+    }
+
     [[nodiscard]] bool uses_prepared_file_writes() override
     {
         return false;