This adds a new forum SEO module to improve how question and answer pages are described for search engines and sharing previews. It also adds smiley assets to make forum content more expressive for users.

<b>Task:</b> https://www.odoo.com/web#id=9107&view_type=form&model=project.task&menu_id=3942&action=327
<b>Pad:</b> https://pad.odoo.com/p/r.aAXbFLdZvu62soZi

<b>New Module:</b> website_forum_seo
<b>VIew Demo:</b> https://www.youtube.com/watch?v=_lYH_GrRqso

Users with access to multiple companies can now switch between their allowed companies directly from the top bar. This makes multi-company work faster and reduces the need to navigate through user settings or menus.

…er has multicompany rights and more than one allowed companies

Task: https://www.odoo.com/web#id=12374&view_type=form&model=project.task&menu_id=3942&action=327

Pad: https://pad.odoo.com/p/r.rXPVFx60UwdLf8R9

New items that can appear on the website, such as payment providers, delivery methods, and partners, are now kept unpublished until someone intentionally publishes them. This reduces the risk of unfinished or inappropriate records becoming visible to customers and makes publication controls easier to find.

…published=False
TASK : https://github.com/odoo/odoo/compare/master...odoo-dev:master-unpublished-default-yti?expand=1
PAD : https://pad.odoo.com/p/r.6g3Z8IkioYVqssJl

The website styling has been adjusted to display better on narrow screens. This helps visitors using smaller browser windows or mobile-like layouts see content more clearly and consistently.

Fix issue #2182:

This update prepares Odoo's messaging area for future Slack-style chat changes by renaming group-related pieces to channels and tidying related mail data. It also removes old employee and group suggestion features and simplifies some unread message handling, with limited direct business impact now but smoother future collaboration improvements.

This PR contains all commits before the slack refactoring itself.