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

server/internal/config/config.go

@@ -35,6 +35,7 @@ type SiteConfig struct {
 
 type WeddingConfig struct {
 	Date         time.Time `yaml:"date"`
+	EventEnd     time.Time `yaml:"event_end"`
 	CeremonyTime string    `yaml:"ceremony_time"`
 	RSVPBy       time.Time `yaml:"rsvp_by"`
 	VenueName    string    `yaml:"venue_name"`
@@ -112,6 +113,9 @@ func Load(path string) (*Config, error) {
 	if cfg.Wedding.RSVPBy.IsZero() {
 		return nil, fmt.Errorf("wedding.rsvp_by is required in %s", path)
 	}
+	if cfg.Wedding.EventEnd.IsZero() {
+		return nil, fmt.Errorf("wedding.event_end is required in %s", path)
+	}
 
 	return &cfg, nil
 }