fix: resolving path for shared item leaks parent info

when an item is shared, their path should stop at the closest directory
that is shared. eg if file c is in shared dir b which is in private dir
a, its public facing path should be b/c, not a/b/c. internally, the real
path is still a/b/c.

apps/backend/internal/virtualfs/vfs.go

@@ -823,7 +823,7 @@ func (vfs *VirtualFS) RealPath(ctx context.Context, db bun.IDB, node *Node, scop
 	} else if !ok {
 		return nil, ErrAccessDenied
 	}
-	return buildNoteAbsolutePath(ctx, db, node)
+	return buildNodeAbsolutePath(ctx, db, node, scope.RootNodeID)
 }
 
 func (vfs *VirtualFS) PermanentlyDeleteFiles(ctx context.Context, db bun.IDB, nodes []*Node, scope *Scope) error {