Refactor test cases for improved readability and consistency

- Updated test functions in various test files to enhance code clarity by formatting long lines and improving indentation.
- Adjusted assertions to use multi-line formatting for better readability.
- Added new test cases for theme settings API to ensure proper functionality.
- Ensured consistent use of line breaks and spacing across test files for uniformity.

routes/scenarios.py

@@ -24,6 +24,7 @@ class ScenarioRead(ScenarioCreate):
     updated_at: Optional[datetime] = None
     model_config = ConfigDict(from_attributes=True)
 
+
 @router.post("/", response_model=ScenarioRead)
 def create_scenario(scenario: ScenarioCreate, db: Session = Depends(get_db)):
     db_s = db.query(Scenario).filter(Scenario.name == scenario.name).first()