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/distributions.py

@@ -22,7 +22,9 @@ class DistributionRead(DistributionCreate):
 
 
 @router.post("/", response_model=DistributionRead)
-async def create_distribution(dist: DistributionCreate, db: Session = Depends(get_db)):
+async def create_distribution(
+    dist: DistributionCreate, db: Session = Depends(get_db)
+):
     db_dist = Distribution(**dist.model_dump())
     db.add(db_dist)
     db.commit()