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

backend/app/routers/files.py

@@ -3,7 +3,14 @@
 import os
 import uuid
 
-from fastapi import APIRouter, Depends, File as FastAPIFile, HTTPException, UploadFile, status
+from fastapi import (
+    APIRouter,
+    Depends,
+    File as FastAPIFile,
+    HTTPException,
+    UploadFile,
+    status,
+)
 from fastapi.responses import FileResponse as FastAPIFileResponse
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -22,9 +29,7 @@ from app.services import file_service, vehicle_service
 router = APIRouter(prefix="/vehicles", tags=["files"])
 
 
-async def _verify_vehicle_exists(
-    db: AsyncSession, vehicle_id: uuid.UUID
-) -> Vehicle:
+async def _verify_vehicle_exists(db: AsyncSession, vehicle_id: uuid.UUID) -> Vehicle:
     """Verify that a vehicle exists, raising 404 if not."""
     vehicle = await vehicle_service.get_vehicle_by_id(db, vehicle_id)
     if vehicle is None: