Fix linting and type errors for CI

- Use X | None syntax instead of Optional[X] (UP045)
- Sort imports in dashboard app (I001)
- Remove unnecessary UTF-8 encoding argument (UP012)
- Add 'from err' to exception re-raises (B904)
- Remove unused imports in integration tests (F401)
- Fix useless expression in test (B018)
- Cast **1.5 result to float in LDO model (mypy no-any-return)
- Use functools.partial instead of lambda in server (mypy misc)

src/py_dvt_ate/app/dashboard/app.py

@@ -12,7 +12,6 @@ import streamlit as st
 
 from py_dvt_ate.simulation.physics.engine import PhysicsEngine
 
-
 # History buffer size for charts
 HISTORY_SIZE = 500