Show jump-to-unread when read marker is outside the loaded window

When the m.fully_read marker event is older than the loaded timeline
window, no virtual ReadMarker item is inserted and the chevron-up FAB
silently no-ops. Surfaces the SDK's new fully_read_event_id on RoomInfo
and routes the tap through the existing FocusOnEvent flow so the FAB
appears in catch-up scenarios and lands the user on the marker.

Bumps matrix-rust-components-kotlin to 26.05.20 to pick up the FFI
field; absorbs the ClientBuildException.InvalidRawKey and suspend
SpaceRoomList.rooms / subscribeToRoomUpdate API breaks.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomInfo.kt

@@ -70,6 +70,11 @@ data class RoomInfo(
      * notification settings.
      */
     val numUnreadMentions: Long,
+    /**
+     * Event ID of the user's `m.fully_read` marker for this room, if any.
+     * Can be set even when the event is older than the loaded timeline window.
+     */
+    val fullyReadEventId: EventId?,
     val heroes: ImmutableList<MatrixUser>,
     val pinnedEventIds: ImmutableList<EventId>,
     val creators: ImmutableList<UserId>,