Use the ClientFactory pattern everywhere replacing raw ClientBuilders.

# Conflicts:
#	ElementX/Sources/Services/UserSession/UserSessionStore.swift
#	NSE/Sources/NSEUserSession.swift

ElementX/Sources/Mocks/SDK/ClientBuilderSDKMock.swift

@@ -0,0 +1,24 @@
+//
+// Copyright 2026 Element Creations 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
+import MatrixRustSDK
+import MatrixRustSDKMocks
+
+nonisolated extension ClientBuilderSDKMock {
+    struct Configuration {
+        var disableWellKnownLookup = false
+    }
+    
+    enum MockError: Error { case generic }
+    
+    convenience init(_ configuration: Configuration) {
+        self.init()
+        
+        disableWellKnownLookupDisableWellKnownLookupReturnValue = self
+    }
+}

ElementX/Sources/Mocks/SDK/ClientSDKMock.swift

@@ -14,7 +14,7 @@ nonisolated extension ClientSDKMock {
     struct Configuration {
         // MARK: Authentication
         
-        var serverAddress = "matrix.org"
+        var serverName = "matrix.org"
         var homeserverURL = "https://matrix-client.matrix.org"
         var slidingSyncVersion = SlidingSyncVersion.native
         var oAuthLoginURL: String? = "https://account.matrix.org/authorize"
@@ -43,7 +43,7 @@ nonisolated extension ClientSDKMock {
         homeserverLoginDetailsReturnValue = HomeserverLoginDetailsSDKMock(configuration: configuration)
         slidingSyncVersionReturnValue = configuration.slidingSyncVersion
         userIdServerNameThrowableError = MockError.generic
-        serverReturnValue = "https://\(configuration.serverAddress)"
+        serverReturnValue = "https://\(configuration.serverName)"
         homeserverReturnValue = configuration.homeserverURL
         urlForOauthOauthConfigurationPromptLoginHintDeviceIdAdditionalScopesReturnValue = OAuthAuthorizationDataSDKMock(configuration: configuration)
         loginUsernamePasswordInitialDeviceNameDeviceIdClosure = { [weak self] username, password, _, _ in
@@ -54,7 +54,7 @@ nonisolated extension ClientSDKMock {
             if username.hasPrefix("@"), username.contains(":") {
                 self?.userIdReturnValue = username
             } else {
-                self?.userIdReturnValue = "@\(username):\(configuration.serverAddress)"
+                self?.userIdReturnValue = "@\(username):\(configuration.serverName)"
             }
         }