Various tweaks (#381)

* Add the message delivery status to the plain timeline styler and display it outside of the main content

* Fix glitchy timeline scroll to bottom button

* Fixed bubbled reactions padding

* Simplified the emoji picker, double tapping a timeline item directly opens it now and added a context menu option. Linked it to rust side reaction sending

* Fix the sliding sync cold cache: treat invalidated rooms as filled

* Make splash screen view full screen

* Fix the offline indicator popping up when first setting up the network monitor

* Expose presentationDetents on the NavigationStackCoordinator and start using them for the EmojiPicker

* Fix link tint color

* Linked TimelineReactionsView reaction sending

* Remove now unused/unnecessary classes

* Add changelog

* Fix formatting issue

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -102,20 +102,14 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
             MXLog.warning("Link clicked: \(url)")
         case .sendMessage:
             await sendCurrentMessage()
-        case .sendReaction(let key, _):
-            #warning("Reaction implementation awaiting SDK support.")
-            MXLog.warning("React with \(key) failed. Not implemented.")
+        case .sendReaction(let emoji, let itemId):
+            await timelineController.sendReaction(emoji, for: itemId)
         case .displayEmojiPicker(let itemId):
             callback?(.displayEmojiPicker(itemId: itemId))
-        case .displayReactionsMenuForItemId(let itemId):
-            state.displayReactionsMenuForItemId = itemId
         case .cancelReply:
             state.composerMode = .default
         case .cancelEdit:
             state.composerMode = .default
-        case .emojiTapped(let emoji, let itemId):
-            await timelineController.sendReaction(emoji, for: itemId)
-            state.displayReactionsMenuForItemId = ""
         }
     }
 
@@ -128,8 +122,10 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
     
     private func paginateBackwards() async {
         switch await timelineController.paginateBackwards(Constants.backPaginationPageSize) {
+        case .failure:
+            displayError(.alert(ElementL10n.roomTimelineBackpaginationFailure))
         default:
-            #warning("Treat errors")
+            break
         }
     }
 
@@ -201,7 +197,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         }
         
         var actions: [TimelineItemContextMenuAction] = [
-            .copy, .quote, .copyPermalink, .reply
+            .react, .copy, .quote, .copyPermalink, .reply
         ]
 
         if item.isEditable {
@@ -215,6 +211,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         return .init(actions: actions)
     }
     
+    // swiftlint:disable:next cyclomatic_complexity
     private func processContentMenuAction(_ action: TimelineItemContextMenuAction, itemId: String) {
         guard let timelineItem = timelineController.timelineItems.first(where: { $0.id == itemId }),
               let item = timelineItem as? EventBasedTimelineItemProtocol else {
@@ -222,6 +219,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         }
         
         switch action {
+        case .react:
+            callback?(.displayEmojiPicker(itemId: item.id))
         case .copy:
             UIPasteboard.general.string = item.text
         case .edit: