:bust_in_silhouette: Integrate User Auth with User Features

[LexTruong]

After merging #519, #448, #526, and #527 (user auth, food ratings, food favorites, meal tracker), users should be able to sign in and have their ratings, favorites, and logged meals save to their account.

1. Use BetterAuth's useSession() to check if the user is currently signed in and the user ID.
2. Save the ratings, favorites, and logged meals to real user IDs rather than dummy variables.
3. Users should not be able to rate, favorite, or log meals if they are not logged in.