Introduce the RoomThreadListServiceProxy and expose it from the RoomProxy

Also update the sdk and app mocks and add a simple `RoomThreadListServiceProxyMock`

# Conflicts:
#	ElementX.xcodeproj/project.pbxproj
#	ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
#	SDKMocks/Sources/Generated/SDKGeneratedMocks.swift
#	project.yml

ElementX/Sources/Services/Room/RoomThreadListServiceProxyProtocol.swift

@@ -0,0 +1,38 @@
+//
+// 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 Combine
+import Foundation
+
+// sourcery: AutoMockable
+protocol RoomThreadListServiceProxyProtocol {
+    var itemsPublisher: CurrentValuePublisher<[RoomThreadListItem], Never> { get }
+    
+    var paginationStatePublisher: CurrentValuePublisher<RoomThreadListPaginationState, Never> { get }
+    
+    func paginate() async -> Result<Void, RoomProxyError>
+}
+
+struct RoomThreadListItem: Identifiable {
+    struct MessageDetails {
+        let sender: TimelineItemSender
+        let timestamp: Date
+        let message: AttributedString?
+    }
+    
+    let id: String
+    
+    let rootMessageDetails: MessageDetails
+    let latestMessageDetails: MessageDetails?
+    
+    let numberOfReplies: UInt
+}
+
+enum RoomThreadListPaginationState: Equatable {
+    case idle(endReached: Bool)
+    case loading
+}