[Bug] Align M+ with site gifting changes

Recent site changes have introduced new bugs, features, and interactions that need to be handled.

[x] ~~Automatically account for gift limit for new users, so that maximum gift doesn't need to be changed.~~ Site fixed
[x] Change New User giftbox to max at 100
[ ] Add gift-all button to new New Users page, maxed at 100
[ ] Potentially save gift status (gifted today, gifted, not gifted) per user so that the information can be used site-wide

gardenshade / mam-plus