Move timeline item tap gestures to the items themselves instead of the bubbled styler (#3553)

* Stop observing the timeline context where not necessary.
* Rename the timeline `itemTapped` action to `mediaTapped`

ElementX/Sources/Screens/Timeline/View/TimelineItemViews/StickerRoomTimelineView.swift

@@ -9,7 +9,7 @@ import Foundation
 import SwiftUI
 
 struct StickerRoomTimelineView: View {
-    @EnvironmentObject private var context: TimelineViewModel.Context
+    @Environment(\.timelineContext) private var context
     let timelineItem: StickerRoomTimelineItem
     
     var body: some View {
@@ -18,12 +18,15 @@ struct StickerRoomTimelineView: View {
                           mediaType: .timelineItem(uniqueID: timelineItem.id.uniqueID.id),
                           blurhash: timelineItem.blurhash,
                           size: timelineItem.imageInfo.size,
-                          mediaProvider: context.mediaProvider) {
+                          mediaProvider: context?.mediaProvider) {
                 placeholder
             }
             .timelineMediaFrame(imageInfo: timelineItem.imageInfo)
             .accessibilityElement(children: .ignore)
             .accessibilityLabel("\(L10n.commonSticker), \(timelineItem.body)")
+            .onTapGesture {
+                context?.send(viewAction: .mediaTapped(itemID: timelineItem.id))
+            }
         }
     }
     
@@ -38,7 +41,9 @@ struct StickerRoomTimelineView_Previews: PreviewProvider, TestablePreview {
     static let viewModel = TimelineViewModel.mock
     
     static var previews: some View {
-        body.environmentObject(viewModel.context)
+        body
+            .environmentObject(viewModel.context)
+            .environment(\.timelineContext, viewModel.context)
     }
     
     static var body: some View {