[ADD] crm: use company/contact name for fill partner_info in chatter

Sometimes, when you send an email in the chatter, a pop-up is displayed to fill the partner details
This case happens when the email address you send the email is not associated to an existing partner
In such cases, in lead, we use the company name and contact name to fill the partner name
[FIX] web: css tweaks
[IMP]model: imporved method add_default_value, if context has default value for selection field then check that context value is exist in selection if not then set None.