This commit revamps the grouped-kanban implementation for smaller
screens (aka. mobile) by making it more "responsive" and avoiding
mobile-specific variation. It makes the implementation simpler and
closer to what the user expects from the desktop version.
In a nutshell:
- columns are displayed individually ; an horizontal scroll allows to
switch to the other ones, "snapping" to the column (aka. carroussel-like).
- each column takes 90% of the viewport's width to give a hint of its
siblings.
- each column scrolls (vertically) individually to avoid being lost when
switching from one column to another.
- folded columns are "virtually unfolded": they takes the same space as
the other ones, but content is loaded on-demand.
- some configuration modals are fullscreen for ease of use.
Part of the SCSS revamp task-2704984
task-2883057
Part-of: odoo/odoo#94134
Pierre Paridans
2dd37982e6