Stop storing the openURL action to fix a retain cycle.

Uses the existing timeline action instead.

ElementX/Sources/Screens/Timeline/TimelineViewModel.swift

@@ -202,8 +202,6 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
             Task { state.timelineState.isSwitchingTimelines = false }
         case let .hasScrolled(direction):
             actionsSubject.send(.hasScrolled(direction: direction))
-        case .setOpenURLAction(let action):
-            state.openURL = action
         case .displayPredecessorRoom:
             guard let predecessorID = roomProxy.predecessorRoom?.roomId else {
                 fatalError("Predecessor room should exist if this action is triggered.")
@@ -656,15 +654,15 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
         return nil
     }
 
-    private func handleJoinCommand(message: String) {
+    private func handleJoinCommand(message: String) async {
         guard let alias = String(message.dropFirst(SlashCommand.join.rawValue.count))
             .components(separatedBy: .whitespacesAndNewlines)
             .first,
-            let urlString = try? matrixToRoomAliasPermalink(roomAlias: alias),
-            let url = URL(string: urlString) else {
+            case let .success(resolvedAlias) = await userSession.clientProxy.resolveRoomAlias(alias) else {
             return
         }
-        state.openURL?(url)
+        
+        actionsSubject.send(.displayRoom(roomID: resolvedAlias.roomId, via: resolvedAlias.servers))
     }
     
     private func sendCurrentMessage(_ message: String, html: String?, mode: ComposerMode, intentionalMentions: IntentionalMentions) async {
@@ -694,7 +692,7 @@ class TimelineViewModel: TimelineViewModelType, TimelineViewModelProtocol {
         case .default:
             switch slashCommand(message: message) {
             case .join:
-                handleJoinCommand(message: message)
+                await handleJoinCommand(message: message)
             case .none:
                 await timelineController.sendMessage(message,
                                                      html: html,