Refactoring

[HarshdipSaha]

Is your feature request related to a problem? Please describe.

Yes. The codebase currently contains a significant amount of duplicate code related to the structure tree data models.

Specifically, the classes StructureTreeItem and StructureTreeModel are defined almost identically in two separate files:

• brainrender_napari/widgets/structure_view.py
• brainrender_napari/data_models/structure_tree_model.py

This introduces a clear maintenance risk. If a bug is fixed or a feature is added to one implementation, the same change must be manually applied to the other. This is error-prone and likely to result in inconsistent behavior over time.

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Describe the solution you'd like

I propose refactoring the codebase to consolidate the structure tree model into a single source of truth.

Refactor Plan

• Keep StructureTreeItem and StructureTreeModel definitions in
  brainrender_napari/data_models/structure_tree_model.py
  as the canonical implementation

• Remove the redundant class definitions from:
  brainrender_napari/widgets/structure_view.py

• Update structure_view.py to import the shared model instead:

from brainrender_napari.data_models.structure_tree_model import StructureTreeModel