fix: Auto download Lotw user list at launch

internal/clublog/manager.go

@@ -50,6 +50,17 @@ func (m *Manager) Info() (date string, count int) {
 	return m.db.Date(), m.db.Count()
 }
 
+// NeedsRefresh reports whether the cached country file is missing or older than
+// maxAge — so the caller re-downloads it to pick up newly-added date-ranged
+// exceptions (e.g. an event call's fresh SARDINIA period).
+func (m *Manager) NeedsRefresh(maxAge time.Duration) bool {
+	fi, err := os.Stat(m.Path())
+	if err != nil {
+		return true // missing
+	}
+	return time.Since(fi.ModTime()) > maxAge
+}
+
 // EnsureLoaded loads the cached file into memory if present. Does NOT download.
 func (m *Manager) EnsureLoaded() error {
 	if m.Loaded() {