Уведомления в фоне, оптимизация FPS чата, release notes, read receipts паритет с Android

Rosetta/Core/Network/Protocol/ProtocolManager.swift

@@ -105,14 +105,39 @@ final class ProtocolManager: @unchecked Sendable {
     }
 
     /// Verify connection health after returning from background.
-    /// Always force reconnect — after background, the socket is likely dead
-    /// and a 2s ping timeout just delays the inevitable.
+    /// Fast path: if already authenticated, send a WebSocket ping first (< 100ms).
+    /// If pong arrives, connection is alive — no reconnect needed.
+    /// If ping fails or times out (500ms), force full reconnect.
     func reconnectIfNeeded() {
         guard savedPublicKey != nil, savedPrivateHash != nil else { return }
 
         // Don't interrupt active handshake
         if connectionState == .handshaking { return }
 
+        // Fast path: if authenticated, try ping first before tearing down.
+        if connectionState == .authenticated, client.isConnected {
+            Self.logger.info("Foreground — ping check")
+            client.sendPing { [weak self] error in
+                guard let self else { return }
+                if error == nil {
+                    // Pong received — connection alive, send heartbeat to keep it fresh.
+                    Self.logger.info("Foreground ping OK — connection alive")
+                    self.client.sendText("heartbeat")
+                    return
+                }
+                // Ping failed — connection dead, force reconnect.
+                Self.logger.info("Foreground ping failed — force reconnecting")
+                self.handshakeComplete = false
+                self.heartbeatTask?.cancel()
+                Task { @MainActor in
+                    self.connectionState = .connecting
+                }
+                self.client.forceReconnect()
+            }
+            return
+        }
+
+        // Not authenticated — force reconnect immediately.
         Self.logger.info("Foreground reconnect — force reconnecting")
         handshakeComplete = false
         heartbeatTask?.cancel()