Refactor delegates and improve context menu opening

This unifies the context menu opening and makes sure that clicking *anywhere* on the delegate opens the context menu, not just on the content

imports/NeoChat/Component/Timeline/ImageDelegate.qml

@@ -18,6 +18,8 @@ TimelineContainer {
     onReplyClicked: ListView.view.goToEvent(eventID)
     hoverComponent: hoverActions
 
+    onOpenContextMenu: openFileContext(model, imageDelegate)
+
     property var content: model.content
     readonly property bool isAnimated: contentType === "image/gif"
 
@@ -83,11 +85,6 @@ TimelineContainer {
             }
         }
 
-        TapHandler {
-            acceptedButtons: Qt.RightButton
-            onTapped: openFileContext(model, parent)
-        }
-
         TapHandler {
             acceptedButtons: Qt.LeftButton
             onLongPressed: openFileContext(model, parent)