feat(cmake): add native file dialog support for Windows/Linux

- Introduced a new file dialog implementation using nativefiledialog-extended for better file handling on Windows and Linux platforms.
- Updated CMake configuration to link the new file dialog library and include necessary directories.
- Enhanced the editor library to conditionally link a test support library when testing is enabled.

Benefits:
- Improved user experience with native file dialogs for file operations.
- Streamlined testing support in the editor library, enhancing modularity and maintainability.

src/app/platform/file_dialog_nfd.cc

@@ -0,0 +1,122 @@
+// Windows and Linux implementation of FileDialogWrapper using nativefiledialog-extended
+#include "util/file_util.h"
+
+#include <nfd.h>
+#include <filesystem>
+#include <vector>
+#include <string>
+
+namespace yaze {
+namespace util {
+
+std::string FileDialogWrapper::ShowOpenFileDialog() {
+  nfdchar_t* outPath = nullptr;
+  nfdresult_t result = NFD_OpenDialog(nullptr, nullptr, &outPath);
+  
+  if (result == NFD_OKAY) {
+    std::string path(outPath);
+    NFD_FreePath(outPath);
+    return path;
+  }
+  
+  return "";
+}
+
+std::string FileDialogWrapper::ShowOpenFolderDialog() {
+  nfdchar_t* outPath = nullptr;
+  nfdresult_t result = NFD_PickFolder(nullptr, &outPath);
+  
+  if (result == NFD_OKAY) {
+    std::string path(outPath);
+    NFD_FreePath(outPath);
+    return path;
+  }
+  
+  return "";
+}
+
+std::string FileDialogWrapper::ShowSaveFileDialog(const std::string& default_name,
+                                                   const std::string& default_extension) {
+  nfdchar_t* outPath = nullptr;
+  nfdfilteritem_t filterItem[1] = {{default_extension.empty() ? "All Files" : default_extension.c_str(), 
+                                    default_extension.empty() ? "*" : default_extension.c_str()}};
+  
+  nfdresult_t result = NFD_SaveDialog(default_extension.empty() ? nullptr : filterItem, 
+                                      default_extension.empty() ? 0 : 1,
+                                      nullptr, 
+                                      default_name.c_str(),
+                                      &outPath);
+  
+  if (result == NFD_OKAY) {
+    std::string path(outPath);
+    NFD_FreePath(outPath);
+    return path;
+  }
+  
+  return "";
+}
+
+std::vector<std::string> FileDialogWrapper::GetSubdirectoriesInFolder(
+    const std::string& folder_path) {
+  std::vector<std::string> subdirs;
+  
+  try {
+    for (const auto& entry : std::filesystem::directory_iterator(folder_path)) {
+      if (entry.is_directory()) {
+        subdirs.push_back(entry.path().string());
+      }
+    }
+  } catch (...) {
+    // Return empty vector on error
+  }
+  
+  return subdirs;
+}
+
+std::vector<std::string> FileDialogWrapper::GetFilesInFolder(
+    const std::string& folder_path) {
+  std::vector<std::string> files;
+  
+  try {
+    for (const auto& entry : std::filesystem::directory_iterator(folder_path)) {
+      if (entry.is_regular_file()) {
+        files.push_back(entry.path().string());
+      }
+    }
+  } catch (...) {
+    // Return empty vector on error
+  }
+  
+  return files;
+}
+
+// Delegate to main implementations
+std::string FileDialogWrapper::ShowOpenFileDialogNFD() {
+  return ShowOpenFileDialog();
+}
+
+std::string FileDialogWrapper::ShowOpenFileDialogBespoke() {
+  return ShowOpenFileDialog();
+}
+
+std::string FileDialogWrapper::ShowSaveFileDialogNFD(const std::string& default_name,
+                                                      const std::string& default_extension) {
+  return ShowSaveFileDialog(default_name, default_extension);
+}
+
+std::string FileDialogWrapper::ShowSaveFileDialogBespoke(const std::string& default_name,
+                                                          const std::string& default_extension) {
+  return ShowSaveFileDialog(default_name, default_extension);
+}
+
+std::string FileDialogWrapper::ShowOpenFolderDialogNFD() {
+  return ShowOpenFolderDialog();
+}
+
+std::string FileDialogWrapper::ShowOpenFolderDialogBespoke() {
+  return ShowOpenFolderDialog();
+}
+
+}  // namespace util
+}  // namespace yaze
+