- fix condition to correctly display company logo placeholder
- use avatar_grey on the "Contacts & Addresses" as white on white is not visible
- use `cover` to avoid excessive zoom on mobile

closes #38001

closes odoo/odoo#38319

X-original-commit: 1210cb70
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>