Add user invite codes (#393)

* Add mobile UIs for invite codes

* Update invite code UIs for web

* Finish implementing invite code behaviors (including notifications of invited users)

* Bump deps

* Update web right nav to use real data; also fix lint

__e2e__/mock-server.ts

@@ -13,7 +13,8 @@ async function main() {
       console.log('Closing old server')
       await server?.close()
       console.log('Starting new server')
-      server = await createServer()
+      const inviteRequired = url?.query && 'invite' in url.query
+      server = await createServer({inviteRequired})
       console.log('Listening at', server.pdsUrl)
       if (url?.query) {
         if ('users' in url.query) {