feat: rebuild desktop UI to match Figma + website, hero slider improvements

- Desktop sidebar (262px, blue gradient, white pill nav), topbar (search + bell + avatar), responsive shell rewritten
- Desktop homepage: immersive hero with Ken Burns animation, pill category chips, date badge cards matching mvnew.eventifyplus.com/home
- Desktop calendar: 60/40 two-column layout with white background
- Desktop profile: full-width banner + 3-column event grids
- Desktop learn more: hero image + about/venue columns + gallery strip
- Desktop settings/contribute: polished to match design system
- Mobile hero slider: RepaintBoundary, animated dots with 44px tap targets, 5s auto-scroll, 8s post-swipe delay, shimmer loading, dynamic event type badge, human-readable dates
- Guest access: requiresAuth false on read endpoints
- Location fix: show place names instead of lat/lng coordinates
- Version 1.6.1+17

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/features/events/services/events_service.dart

@@ -9,7 +9,7 @@ class EventsService {
 
   /// Get event types (POST to /events/type-list/)
   Future<List<EventTypeModel>> getEventTypes() async {
-    final res = await _api.post(ApiEndpoints.eventTypes);
+    final res = await _api.post(ApiEndpoints.eventTypes, requiresAuth: false);
     final list = <EventTypeModel>[];
     final data = res['event_types'] ?? res['event_types'] ?? res;
     if (data is List) {
@@ -27,7 +27,7 @@ class EventsService {
   /// Get events filtered by pincode (POST to /events/pincode-events/)
   /// Use pincode='all' to fetch all events.
   Future<List<EventModel>> getEventsByPincode(String pincode) async {
-    final res = await _api.post(ApiEndpoints.eventsByPincode, body: {'pincode': pincode});
+    final res = await _api.post(ApiEndpoints.eventsByPincode, body: {'pincode': pincode}, requiresAuth: false);
     final list = <EventModel>[];
     final events = res['events'] ?? res['data'] ?? [];
     if (events is List) {
@@ -40,7 +40,7 @@ class EventsService {
 
   /// Event details
   Future<EventModel> getEventDetails(int eventId) async {
-    final res = await _api.post(ApiEndpoints.eventDetails, body: {'event_id': eventId});
+    final res = await _api.post(ApiEndpoints.eventDetails, body: {'event_id': eventId}, requiresAuth: false);
     return EventModel.fromJson(Map<String, dynamic>.from(res));
   }
 
@@ -48,7 +48,7 @@ class EventsService {
   /// Accepts month string and year int.
   /// Returns Map with 'dates' (list of YYYY-MM-DD) and 'date_events' (list with counts).
   Future<Map<String, dynamic>> getEventsByMonthYear(String month, int year) async {
-    final res = await _api.post(ApiEndpoints.eventsByMonth, body: {'month': month, 'year': year});
+    final res = await _api.post(ApiEndpoints.eventsByMonth, body: {'month': month, 'year': year}, requiresAuth: false);
     // expected keys: dates, total_number_of_events, date_events
     return res;
   }