Add a RoomScreenHook.

ElementX/Sources/AppHooks/AppHooks.swift

@@ -9,6 +9,10 @@ import Foundation
 
 class AppHooks: AppHooksProtocol {
     #if IS_MAIN_APP
+    func configure(with userSession: UserSessionProtocol?) async {
+        await roomScreenHook.configure(with: userSession)
+    }
+    
     private(set) var appSettingsHook: AppSettingsHookProtocol = DefaultAppSettingsHook()
     func registerAppSettingsHook(_ hook: AppSettingsHookProtocol) {
         appSettingsHook = hook
@@ -28,6 +32,11 @@ class AppHooks: AppHooksProtocol {
     func registerCertificateValidatorHook(_ hook: CertificateValidatorHookProtocol) {
         certificateValidatorHook = hook
     }
+    
+    private(set) var roomScreenHook: RoomScreenHookProtocol = DefaultRoomScreenHook()
+    func registerRoomScreenHook(_ hook: RoomScreenHookProtocol) {
+        roomScreenHook = hook
+    }
     #endif
     
     private(set) var clientBuilderHook: ClientBuilderHookProtocol = DefaultClientBuilderHook()
@@ -38,6 +47,10 @@ class AppHooks: AppHooksProtocol {
 
 protocol AppHooksProtocol {
     func setUp()
+    
+    #if IS_MAIN_APP
+    func configure(with userSession: UserSessionProtocol?) async
+    #endif
 }
 
 extension AppHooksProtocol {

ElementX/Sources/AppHooks/Hooks/RoomScreenHook.swift

@@ -0,0 +1,18 @@
+//
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+
+protocol RoomScreenHookProtocol {
+    func configure(with userSession: UserSessionProtocol?) async
+    func update(_ viewState: RoomScreenViewState) -> RoomScreenViewState
+}
+
+struct DefaultRoomScreenHook: RoomScreenHookProtocol {
+    func configure(with userSession: UserSessionProtocol?) async { }
+    func update(_ viewState: RoomScreenViewState) -> RoomScreenViewState { viewState }
+}