Making reservations in quick succession bug

[s-j-cunningham]

When 2 or more reservations are made for the same item & pantry with total quantity > inventory supply, they will both go through because the second request checks inventory quantity before the first request reduces it, which can result in a negative inventory quantity.

Possible solutions

• frontend disallow subsequent 'one-click reserve' clicks until a response is received from the first.

Note:
This solution should be replicated in the signup and login components.