## Summary

<!-- One sentence: what does this change? -->

## Linked issue

Closes #

## Type of change

- [ ] Bug fix
- [ ] New feature
- [ ] Refactor / cleanup
- [ ] Documentation
- [ ] CI / tooling

## Architectural checklist

- [ ] No `from PySide6` in `core/` or `services/`
- [ ] No `import openseespy` in `core/` or `views/`
- [ ] Public functions have type hints + docstrings
- [ ] Heavy work runs off the GUI thread

## Testing

<!-- How was this verified? Reference tests added or analytical checks. -->