feat(realtime): keep projects and labels current too, not only tasks

The socket carried task events and nothing else, so a project or a label
created anywhere — another tab, another device, Claude through the
connector — did not appear until a reload. Tasks updated live and the
sidebar did not, which reads as the sidebar being broken rather than as a
gap in what is published.

Projects and labels go to the *user* rather than to a project. A project
that has just been created has no subscribers, because nobody was
watching a thing that did not exist a moment ago.

Labels are announced as "something changed" and re-read, rather than sent
as a payload. The sidebar wants each label's task count, which no single
event carries and which moves whenever a task gains or loses a label —
including through quick add, where "@regnskab" invents the label inside a
task write and no label event is sent at all. Comparing the label lists
on a task change is what catches that, without re-reading on every ticked
checkbox.

And projects now go through an upsert, because the same row arrives twice
— once as the response to the request that created it, once over the
socket. Appending both puts two ids into a keyed {#each}, which throws
and stops the sidebar rendering. The tasks already had that guard; adding
the project event without it reintroduced the identical bug, and the
smoke test caught it on the first run.

Co-Authored-By: Claude Opus 5 <[email protected]>

internal/httpapi/realtime_handlers.go

@@ -28,6 +28,19 @@ func (s *Server) publish(projectID, event string, payload any) {
 	s.hub.Publish(projectID, event, payload)
 }
 
+// publishToOwner sends a change that belongs to a person rather than to a
+// project: their projects, their labels, their saved filters.
+//
+// Project membership is what the socket subscribes to, and a project that has
+// just been created has no subscribers — the person is not watching a thing that
+// did not exist a moment ago. So these go to the user instead, which also
+// reaches their other devices.
+func (s *Server) publishToOwner(r *http.Request, event string, payload any) {
+	if user := userFrom(r.Context()); user != nil {
+		s.hub.PublishToUser(user.ID, event, payload)
+	}
+}
+
 // handleWebSocket is the live-sync connection.
 func (s *Server) handleWebSocket(w http.ResponseWriter, r *http.Request) {
 	user := userFrom(r.Context())