Fix flickering issues due to reconnecting loop

lib/providers/tickets_provider.dart

@@ -361,6 +361,19 @@ final ticketsQueryProvider = StateProvider<TicketQuery>(
   (ref) => const TicketQuery(),
 );
 
+/// Derived provider that selects a single [Ticket] by ID from the tickets list.
+///
+/// Because [Ticket] implements `==`, this provider only notifies watchers when
+/// the specific ticket's data actually changes — not when unrelated tickets in
+/// the list are updated.  Use this in detail screens to avoid full-list rebuilds.
+final ticketByIdProvider = Provider.family<Ticket?, String>((ref, ticketId) {
+  return ref
+      .watch(ticketsProvider)
+      .valueOrNull
+      ?.where((t) => t.id == ticketId)
+      .firstOrNull;
+});
+
 final ticketMessagesProvider =
     StreamProvider.family<List<TicketMessage>, String>((ref, ticketId) {
       final client = ref.watch(supabaseClientProvider);