fix: ruff lint + format fixes in tests, ESLint fixes in frontend

backend/app/services/file_service.py

@@ -98,7 +98,9 @@ async def upload_file(
     """
     # Validate MIME type
     if not validate_mime_type(mime_type, original_filename):
-        raise ValueError(f"Unsupported MIME type: {mime_type} for file: {original_filename}")
+        raise ValueError(
+            f"Unsupported MIME type: {mime_type} for file: {original_filename}"
+        )
 
     # Validate file size (20MB limit for uploads)
     file_size = len(file_content)
@@ -173,9 +175,7 @@ async def list_files(
     Returns (files, total_count).
     """
     # Count total files for this vehicle
-    count_stmt = select(func.count(File.id)).where(
-        File.vehicle_id == vehicle_id
-    )
+    count_stmt = select(func.count(File.id)).where(File.vehicle_id == vehicle_id)
     count_result = await db.execute(count_stmt)
     total = count_result.scalar_one()