Remove item management feature from frontend and backend, and add a pending skeleton component.

backend/tests/utils/item.py

@@ -1,16 +0,0 @@
-from sqlmodel import Session
-
-from app import crud
-from app.models import Item, ItemCreate
-from tests.utils.user import create_random_user
-from tests.utils.utils import random_lower_string
-
-
-def create_random_item(db: Session) -> Item:
-    user = create_random_user(db)
-    owner_id = user.id
-    assert owner_id is not None
-    title = random_lower_string()
-    description = random_lower_string()
-    item_in = ItemCreate(title=title, description=description)
-    return crud.create_item(session=db, item_in=item_in, owner_id=owner_id)