Get App ready for release

Everything from #48 and:

[x] Include user id that caused change in surface and object versions
[x] Split board and board version
[x] (maybe) migrate everything to uuid
[x] add notifications
[x] proper chat access handling
[ ] fix numbers being typed twice on android
[ ] fix viewport size not updated when keyboard opened on iOS (might obscure the focused text field)
[ ] Board invite links
[ ] Board member ui
[x] Import malmal boards
[x] Import HP boards
[ ] Make canvas list size configureable
[x] Add button to hide / show canvas list
[ ] Improve stability of surfaces, especially during undo / redo
[ ] Show tool icon next to cursor
[ ] Lower nametag opacity when hovering and not pressing / clicking
[ ] Fix color picker on iPad
[ ] Fix missing last bit of the stroke (see brush preset preview)
[ ] Sync payments with revenuecat
[ ] Add some way to edit subscription
[ ] Gate custom brushes behind subscription

hellopaint-io / hellopaint