cyypherus/backer

AI Summary: Enhance the `backer` crate's layout system to allow users to specify node positions relative to their parent or globally. This involves modifying the `Area` struct and related functions to include relative and global translation properties, and updating the layout algorithm to handle these new properties correctly. The goal is to provide more flexible positioning options for UI elements.

AI Summary: Refactor the Backer library's layout algorithm to replace its recursive implementation with an iterative approach using a stack or queue data structure. This is necessary to prevent stack overflow errors when dealing with deeply nested layouts.