Reflection over reflect.Kind was overkill: only top-level doer/assignee/
member fields are ever rendered, and the walk forced an exhaustive linter
exclusion. List the user fields per notification type instead, which drops
the reflect dependency and the .golangci.yml carve-out.
Notifications stored before the acting user was resolved with its full
profile (#2720) were serialized with only id+username, so they kept
rendering the auto-generated username instead of the display name.
Reload every embedded user from the database when reading a user's
notifications, healing already-stored rows at read time. The refresh is
not persisted; a per-page cache fetches each user once.
kolaente