Changes needed for fedora compilation

[dov]

The following patch was needed to compile Gladius (HEAD: 841f359) on Fedora 41. There seems to be some mix up between the versions of nanovdb and imgui declared in vcpkg and the once used for compilation.

diff --git a/gladius/src/io/MeshExporter.cpp b/gladius/src/io/MeshExporter.cpp
index 1f29d43..c826956 100644
--- a/gladius/src/io/MeshExporter.cpp
+++ b/gladius/src/io/MeshExporter.cpp
@@ -370,7 +370,7 @@ namespace gladius::vdb
     {
         try
         {
-            auto handle = nanovdb::openToNanoVDB(m_grid);
+            auto handle = nanovdb::tools::openToNanoVDB(m_grid);
             std::vector<nanovdb::GridHandle<>> handles;
             handles.push_back(std::move(handle));
             nanovdb::io::writeGrids<nanovdb::HostBuffer, std::vector>(m_fileName.string(), handles);
diff --git a/gladius/src/io/VdbImporter.h b/gladius/src/io/VdbImporter.h
index f538bf4..f2f5bd9 100644
--- a/gladius/src/io/VdbImporter.h
+++ b/gladius/src/io/VdbImporter.h
@@ -177,7 +177,7 @@ namespace gladius::vdb
         //     return importFromGridUint8<T>(sdfGrid, primitives, scaling);
         // }
 
-        auto handle = nanovdb::openToNanoVDB(sdfGrid);
+        auto handle = nanovdb::tools::openToNanoVDB(sdfGrid);
         auto * grid = handle.grid<T>();
 
         if (!grid)
@@ -246,4 +246,4 @@ namespace gladius::vdb
         TriangleMesh m_mesh;
     };
 
-}
\ No newline at end of file
+}
diff --git a/gladius/src/ui/WelcomeScreen.cpp b/gladius/src/ui/WelcomeScreen.cpp
index a9e8e27..686d3a4 100644
--- a/gladius/src/ui/WelcomeScreen.cpp
+++ b/gladius/src/ui/WelcomeScreen.cpp
@@ -420,7 +420,7 @@ namespace gladius::ui
             const float listWidth = windowWidth - buttonWidth - 40.0f; // 20px padding on each side
 
             // Left side - actions
-            ImGui::BeginChild("ActionsPane", ImVec2(buttonWidth, 0), ImGuiChildFlags_None);
+            ImGui::BeginChild("ActionsPane", ImVec2(buttonWidth, 0), 0);
 
             ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(10, 10));