Release 1.0.0 baseline

MealMood/Services/CalendarService.swift

@@ -28,8 +28,10 @@ final class CalendarService {
         weekStartDate: Date,
         settings: AppSettings
     ) -> String? {
-        guard let calendarId = settings.calendarId,
-              let calendar = eventStore.calendar(withIdentifier: calendarId) else { return nil }
+        guard let calendar = resolvedCalendar(for: settings) else {
+            print("Calendar sync skipped: no writable calendar available")
+            return nil
+        }
 
         let event = EKEvent(eventStore: eventStore)
 
@@ -81,4 +83,17 @@ final class CalendarService {
             try? eventStore.save(event, span: .thisEvent)
         }
     }
+
+    private func resolvedCalendar(for settings: AppSettings) -> EKCalendar? {
+        if let calendarId = settings.calendarId,
+           let calendar = eventStore.calendar(withIdentifier: calendarId) {
+            return calendar
+        }
+
+        if let defaultCalendar = eventStore.defaultCalendarForNewEvents {
+            return defaultCalendar
+        }
+
+        return eventStore.calendars(for: .event).first
+    }
 }