Ensure await on storeEntity and handle async operations correctly - #171

storeEntity was fire-and-forget: the MongoDB write could fail
silently while the caller already received a success reply.
On any write error or process restart the session was lost,
effectively logging the user out with no warning.

Also refactors the async-inside-create pattern out: getEntity
is now awaited before create(), and create() is synchronous,
which avoids nested create() races introduced by storeEntity's
own internal cache update.

https://claude.ai/code/session_01DUUFUFpsvj4y6xU5172pX4

The ask+send block inside a synchronous create() callback was
fire-and-forget: the admin got a success reply before the
session role was updated, leaving a window where a downgraded
user still held their old permissions.

Moves the session update after storeEntity completes, uses ask
for StoreSession (now that StoreSession awaits its own write),
and guards against users with no active session.

https://claude.ai/code/session_01DUUFUFpsvj4y6xU5172pX4

Block, Unblock, IncreaseCount, and StoreFingerprint all called
storeEntity without await inside synchronous .match() callbacks.
A MongoDB write failure was silently discarded, so a blocked
fingerprint could revert to unblocked after a process restart.

Restructures each handler to extract the fingerprint via
early-return rather than .match(), allowing storeEntity to be
properly awaited before notifying subscribers.

https://claude.ai/code/session_01DUUFUFpsvj4y6xU5172pX4

…csActor

Quiz answer statistics were broadcast to all subscribers and
returned to the caller before the MongoDB write completed.
A write failure was silently swallowed, leaving subscribers
with data that was never persisted.

https://claude.ai/code/session_01DUUFUFpsvj4y6xU5172pX4

ChangeNicknameModal: .ask().then() had no .catch(), so a
UserStore network error propagated as an unhandled rejection
and the uniqueness error was silently lost.

SharingActor.AddEntry: same pattern — a UserStore rejection
on teacher lookup left the sharing dialog with no feedback.
Now maps the rejection to a queryNotFound error entry so the
UI shows an explicit failure rather than silently doing nothing.

https://claude.ai/code/session_01DUUFUFpsvj4y6xU5172pX4