fix(3d): Handle user_data meshes in visual debug wireframe rendering

- Check user_data before calling GetMeshAsset() in renderer_draw.cc
- Prevents crash when rendering manually loaded OBJ meshes with --debug
- Remove duplicate wireframe call in test_mesh.cc (now handled by renderer)
- Keep add_mesh_normals() call (not auto-handled by renderer)

Fixes: Bus error when running 'test_mesh house.obj --debug'
Root cause: GetMeshAsset(0) on non-asset meshes
Test: All 32 tests pass, test_mesh works with --debug flag

1 files changed, 1 insertions, 5 deletions

diff --git a/src/tests/test_mesh.cc b/src/tests/test_mesh.cc
index 0865f80..2129bc8 100644
--- a/src/tests/test_mesh.cc
+++ b/src/tests/test_mesh.cc
@@ -386,11 +386,7 @@ int main(int argc, char** argv) {
       dbg.add_mesh_normals(g_scene.objects[1].get_model_matrix(),
                            (uint32_t)data->vertices.size(),
                            data->vertices.data());
-      dbg.add_mesh_wireframe(g_scene.objects[1].get_model_matrix(),
-                             (uint32_t)data->vertices.size(),
-                             data->vertices.data(),
-                             (uint32_t)data->indices.size(),
-                             data->indices.data(), vec3(0.0f, 1.0f, 1.0f));
+      // Wireframe is now handled automatically by renderer
     }
 #endif /* !defined(STRIP_ALL) */