fix(ui): stabilize theme colors and calendar end time

server/internal/api/handlers.go

@@ -58,6 +58,7 @@ func (s *Server) handleConfig(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, map[string]string{
 		"siteUrl":      s.cfg.Site.URL,
 		"weddingDate":  s.cfg.Wedding.Date.Format(time.RFC3339),
+		"eventEnd":     s.cfg.Wedding.EventEnd.Format(time.RFC3339),
 		"ceremonyTime": s.cfg.Wedding.CeremonyTime,
 		"rsvpByDate":   s.cfg.Wedding.RSVPBy.Format(time.RFC3339),
 		"venueName":    s.cfg.Wedding.VenueName,