[Feature] Return to folder view scrolls to and highlights the last viewed asset

I have searched the existing feature requests, both open and closed, to make sure this is not a duplicate request. • Yes The feature Summary When browsing assets in the Folders view, tapping a photo opens the full-screen asset viewer. After swiping through several photos and then going back, the folder list stays at the position where the user originally entered (the asset that was tapped), not where they stopped browsing. It would be nice if the list automatically scrolled to the last viewed asset and highlighted it on return. Proposed behavior • After returning from the asset viewer, the folder list scrolls to the last viewed asset. • The asset tile is visually highlighted (e.g. tinted background) so the user can continue from where they left off. Technical notes (from code) • assetViewerProvider is a global provider and is not reset when the viewer closes, so the last viewed currentAsset is still readable after pop (mobile/lib/providers/asset_vi…