SlicerTrame server does not start

After clicking "Start Server" in SlicerTrameServer module, I get the following error and the server does not start:

```
qSlicerMarkupsModulePrivate::addToolBar: no main window is available, toolbar is not added

qSlicerSequencesModulePrivate::addToolBar: no main window is available, toolbar is not added

Loading Slicer RC file [C:/Users/andra/.slicerrc.py]

Traceback (most recent call last):
File "", line 5, in
File "", line 10, in
File "C:\D/trame-slicer/examples\widgets\__init__.py", line 7, in

from .tools_strip import ToolsStrip
File "C:\D/trame-slicer/examples\widgets\tools_strip.py", line 11, in
from .segmentation_button import SegmentationButton
File "C:\D/trame-slicer/examples\widgets\segmentation_button.py", line 22, in
from trame_slicer.segmentation import (
ImportError: cannot import name 'SegmentationEffectID' from 'trame_slicer.segmentation' (C:\Users\andra\AppData\Local\slicer.org\3D Slicer 5.11.0-2025-12-09\lib\Python\Lib\site-packages\trame_slicer\segmentation\__init__.py). Did you mean: 'SegmentationEffect'?
```

The same happened when I tried with Slicer-5.10.

Start with examples/widgets/segmentation_button.py and examples/widgets/__init__.py, then inspect the trame_slicer.segmentation package named in the traceback to compare the requested import with the installed package. Reproduce the Start Server action in Slicer 5.10 or 5.11; done means SlicerTrameServer starts without the ImportError.

Written by the indexing model from the issue text.