notifications on waitlist actions

[snailcato]

User stories

As a waiting User I want to know when it's my turn to pick up the item I waited for.

Dependencies

Depends on:

• Add User to Waitlist of an Item #28
• [Spike] Model Lending Process #14

UI Mockup

[UI Mockup]

Context

as for now you can only join and leave the waitlist, more logic was not contained in #28.

Acceptance Criteria

• passiv notification on waitlist join
  "You've joined the waitlist for [ITEM NAME], your posiotion is [POSITION]."
  "Du bist jetzt auf X. Position der Warteliste für [ITEM NAME]."
• active notification at position 0
  "You can borrow/pick up the item [ITEM NAME] from your waiting list now."
  "Du kannst das Item [ITEM NAME] von deiner Warteliste jetzt ausleihen/abholen."
• î acts like normal lend request for the owner

[AlexanderUngefug]

If necessary, our waitlist developers are ready to answer your questions.

[jacob271]

When implementing #35, we noticed that notifications for "move up on waitlist" already exist. However, they are only triggered if another user actively leaves the waitlist. If a user successfully borrows and returns an item, the waitlist positions still stay the same. This should be fixed when working on this issue