Allow previews in the timeline to include filtered galleries (#5943)

* remove the usage of the timeline kind override in favour of getting it properly from the timeline view model

* allow the previews to include gallery items filtered by the allowed types when started outside the gallery

sss

asa

* fix for actions not being forwarded to the timeline right

* pr suggestions

ElementX/Sources/Services/Timeline/TimelineController/TimelineControllerProtocol.swift

@@ -26,7 +26,7 @@ enum TimelineControllerAction {
     }
     
     case displayMediaPreview(item: EventBasedMessageTimelineItemProtocol, timelineViewModel: TimelineViewModelKind)
-    case displayGalleryPreview(galleryItem: GalleryRoomTimelineItem, initialIndex: Int)
+    case displayGalleryPreview(galleryItem: GalleryRoomTimelineItem, timelineViewModel: TimelineViewModelKind)
     case displayLocation(StaticLocationData)
     case displayLiveLocation(sender: TimelineItemSender, initialLiveLocationShare: LiveLocationShare)
     case none
@@ -47,6 +47,9 @@ enum TimelineControllerError: Error {
 protocol TimelineControllerProtocol: Sendable {
     var timelineKind: TimelineKind { get }
     
+    /// The gallery attachments this timeline includes, or `nil` when it isn't filtered.
+    var allowedGalleryItemTypes: [TimelineAllowedGalleryItemType]? { get }
+    
     /// The currently known items, use only for setting up the intial state.
     var timelineItems: [RoomTimelineItemProtocol] { get }