bug: filepath in MeshSeries
After updated to the latest version, [this if-condition](https://gitlab.opengeosys.org/ogs/tools/ogstools/-/blob/main/ogstools/meshlib/mesh_series.py?ref_type=heads#L386-387) in MeshSeries leads to the following error
```console
File ~/.venv/lib/python3.13/site-packages/ogstools/meshlib/mesh_series.py:370, in MeshSeries.mesh(self, timestep, lazy_eval)
368 mesh.filepath = Path(self.timestep_files[data_timestep])
369 else:
--> 370 mesh.filepath = self.filepath
371 return mesh
File ~/.venv/lib/python3.13/site-packages/pyvista/core/utilities/misc.py:331, in _NoNewAttrMixin.__setattr__(self, key, value)
324 from pyvista import PyVistaAttributeError # noqa: PLC0415
326 msg = (
327 f'Attribute {key!r} does not exist and cannot be added to class '
328 f'{self.__class__.__name__!r}\nUse `pv.set_new_attribute` to set new '
329 f'attributes or consider setting a private variable (with `_` prefix) instead.'
330 )
--> 331 raise PyVistaAttributeError(msg)
332 object.__setattr__(self, key, value)
PyVistaAttributeError: Attribute 'filepath' does not exist and cannot be added to class 'PolyData'
Use `pv.set_new_attribute` to set new attributes or consider setting a private variable (with `_` prefix) instead.
```
Commented that `if-condition` fixes the error temporally.
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