Fix timestamp method and loop variable order issues

Updated `datetime.utcnow()` to `datetime.now()` to align with local timezone handling. Corrected the order of unpacked variables in the loop to match the structure of `pucks_with_latest_events`.

backend/app/routers/puck.py

@@ -258,6 +258,7 @@ async def get_pucks_with_tell_position(db: Session = Depends(get_db)):
                     Sample(
                         id=sample.id,
                         sample_name=sample.sample_name,
+                        mount_count=sample.mount_count,
                         position=sample.position,
                         puck_id=sample.puck_id,
                         data_collection_parameters=(