This commit improves cards and toggles designs and part of the overall
v16 SCSS optimization/restyle, task-2704984.
The default values of the cards wasn't consistant with the rest of odoo
(ie. default background color value was grey instead of the BS default
which is white) and to avoid these inconsistencies, the card classes
were not used (even though we do have card-like visual elements).
Before this commit, if we wanted to use them, we had to add utility
classes all over the place (ie. the 'bg-white' class) which is not
optimal.
This commit also simplifies toggle's visual rendering by removing
unnecessary graphical elements that were not readable in regular & small
font-size,
In some case the toggle design was even irrelevant with the content and
required unnecessary overrides in css to hide it (ie. it's ok in
Recruitment but not in Payroll).
task-2924487
closesodoo/odoo#98770
Related: odoo/enterprise#29829
Signed-off-by: Pierre Paridans (app) <app@odoo.com>