This draft update modernizes how form sections are laid out in Odoo Enterprise by replacing older table-based structures with more flexible grid layouts. The change supports the broader interface restyling effort and should make forms easier to maintain and adapt across screen sizes.

This PR replaces the FormView group tables with css grids.
Part of the overall v16 SCSS optimization/restyle, task-2704984

Requires:
- https://github.com/odoo/odoo/pull/98911

task-2918464