Allow moving tickets between projects with P.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ticket/jsontimestore.go

@@ -153,6 +153,34 @@ func (s *JSONTimeStore) Delete(id string) error {
 	return s.writeUnlocked(out)
 }
 
+// RetargetTicket sets ProjectID on all entries for a ticket.
+func (s *JSONTimeStore) RetargetTicket(ticketID, projectID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if ticketID == "" {
+		return fmt.Errorf("ticketId is required")
+	}
+	if projectID == "" {
+		return fmt.Errorf("projectId is required")
+	}
+	entries, err := s.readUnlocked()
+	if err != nil {
+		return err
+	}
+	changed := false
+	for i := range entries {
+		if entries[i].TicketID == ticketID {
+			entries[i].ProjectID = projectID
+			changed = true
+		}
+	}
+	if !changed {
+		return nil
+	}
+	return s.writeUnlocked(entries)
+}
+
 // DeleteByProject removes all time entries for a project.
 func (s *JSONTimeStore) DeleteByProject(projectID string) error {
 	s.mu.Lock()