Render canvas image nodes with object-contain

Show the full picture inside image resource nodes instead of cropping
with object-cover; matches the reference product where node frames
adapt to the image and no content is clipped, and fixes existing
nodes created before aspect fitting was added.

components/canvas/LiblibVideoCanvasReplica.tsx

@@ -19512,7 +19512,7 @@ function PresetMediaCanvasNode({
           ) : mediaUrl ? (
             <img
               alt={node.title}
-              className={cn("pointer-events-none h-full w-full", localEditMode || isCharacterThreeViewNode(node) ? "object-contain" : "object-cover")}
+              className="pointer-events-none h-full w-full object-contain"
               draggable={false}
               onDragStart={preventNativeImageDrag}
               src={mediaUrl}