✨ Dynamic chat online counter basis

lib/pods/chat/chat_online_count.dart

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+import 'dart:async';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:island/pods/network.dart';
+import 'package:island/pods/websocket.dart';
+import 'package:island/models/account.dart';
+
+part 'chat_online_count.g.dart';
+
+@riverpod
+class ChatOnlineCountNotifier extends _$ChatOnlineCountNotifier {
+  @override
+  Future<int> build(String chatroomId) async {
+    final apiClient = ref.watch(apiClientProvider);
+    final ws = ref.watch(websocketProvider);
+
+    // Fetch initial online count
+    final response = await apiClient.get(
+      '/sphere/chat/$chatroomId/members/online',
+    );
+    final initialCount = response.data as int;
+
+    // Listen for websocket status updates
+    final subscription = ws.dataStream.listen((WebSocketPacket packet) {
+      if (packet.type == 'accounts.status.update') {
+        final data = packet.data;
+        if (data != null && data['chat_room_id'] == chatroomId) {
+          final status = SnAccountStatus.fromJson(data['status']);
+          var delta = status.isOnline ? 1 : -1;
+          if (status.clearedAt != null &&
+              status.clearedAt!.isBefore(DateTime.now())) {
+            if (status.isInvisible) delta = 1;
+          }
+          // Update count based on online status
+          state.whenData((currentCount) {
+            final newCount = currentCount + delta;
+            state = AsyncData(
+              newCount.clamp(0, double.infinity).toInt(),
+            ); // Ensure non-negative
+          });
+        }
+      }
+    });
+
+    ref.onDispose(() {
+      subscription.cancel();
+    });
+
+    return initialCount;
+  }
+}