Fix: handle stale sessions and migrated users without household_id

meals.py

@@ -18,12 +18,13 @@ meals_bp = Blueprint("meals", __name__)
 
 
 def login_required(f):
-    """Decorator: redirect to login if not authenticated."""
+    """Decorator: redirect to login if not authenticated or session is stale."""
     from functools import wraps
 
     @wraps(f)
     def wrapper(*args, **kwargs):
-        if "user_id" not in session:
+        if "user_id" not in session or "household_id" not in session:
+            session.clear()
             return redirect(url_for("auth.login"))
         return f(*args, **kwargs)
 
@@ -51,6 +52,10 @@ def dashboard():
         except ValueError:
             flash("Invalid date format. Use YYYY-MM-DD.", "error")
 
+    if household_id is None:
+        session.clear()
+        return redirect(url_for("auth.login"))
+
     data = get_dashboard_data(today, household_id)
     return render_template(
         "dashboard.html",