Preserve typing events in iOS FFI

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSCore/ViewModels.swift

@@ -6,6 +6,7 @@ public final class SessionStore: ObservableObject {
     @Published public private(set) var account: Account
     @Published public private(set) var authState: AuthState = .waitTdlibParameters
     @Published public private(set) var networkState: NetworkState = .ready
+    @Published public private(set) var typingState: TypingState = .idle
     @Published public private(set) var errorMessage: String?
 
     public let bridge: SessionBridge
@@ -40,6 +41,8 @@ public final class SessionStore: ObservableObject {
                 authState = state
             case let .networkChanged(state):
                 networkState = state
+            case let .typingChanged(state):
+                typingState = state
             default:
                 break
             }