get rid of NFD dependency since im using SDL3 and its builtin functionality

src/frontend/SettingsWindow.cpp

@@ -1,5 +1,4 @@
 #include <SettingsWindow.hpp>
-#include <nfd.hpp>
 #include <log.hpp> 
 #include <Options.hpp>
 #include <imgui.h>
@@ -20,18 +19,22 @@ bool SettingsWindow::render() {
 
   if(ImGui::BeginTabItem("General")) {
     if(ImGui::Button("Pick...")) {
-      NFD::Guard guard;
-      NFD::UniquePath outPath;
+      SDL_ShowOpenFolderDialog([](void *userdata, const char * const *filelist, int filter) {
+        SettingsWindow* settings = (SettingsWindow*)userdata;
+      
+        if (!filelist) {
+          panic("An error occured: %s", SDL_GetError());
+          return;
+        } else if (!*filelist) {
+          warn("The user did not select any file.");
+          warn("Most likely, the dialog was canceled.");
+          return;
+        }
 
-      auto result = NFD::PickFolder(outPath);
-      if(result == NFD_ERROR)
-        panic("Error: {}", NFD::GetError());
-
-      if(result != NFD_CANCEL) {
-        savesPath = outPath.get();
-        Options::GetInstance().SetValue<std::string>("general", "savePath", savesPath);
-        applyEnabled = true;
-      }
+        settings->savesPath = *filelist;
+        Options::GetInstance().SetValue<std::string>("general", "savePath", settings->savesPath);
+        settings->applyEnabled = true;
+      }, this, window.getHandle(), nullptr, false);
     }
     ImGui::SameLine();
     ImGui::BeginDisabled();