This commit introduces a full rewrite of the website builder to leverage
the OWL framework and the new HTML editor. The goal is to modernize the
codebase, improve maintainability, and provide a more reactive and
modular architecture.

A major part of this refactoring is the complete rethinking of how
options are defined. They are now implemented as OWL components or simple
template-driven views, and registered as plugins. The system introduces
two distinct concepts: *options*, which handle the user interface, and
*actions*, which encapsulate the actual DOM or HTML updates.

The builder code is now split into two addons:
- `html_builder`: contains a shared foundation for building HTML UIs,
  designed to be reusable across apps, including mass mailing.
- `website`: contains all website-specific logic and components.

The legacy builder code has not been removed yet, as parts of it are
still in use, most notably in the mass mailing application. It will be
removed in the near future.

Many thanks to everyone who contributed to this project, whether through
code, testing, reviews, design, or support — your efforts made this major
milestone possible. Also, this sentence was totally not generated by a AI
language model.

Co-authored-by: aans-odoo <[email protected]>
Co-authored-by: Alessandro Lupo <[email protected]>
Co-authored-by: Alice Gaudon <[email protected]>
Co-authored-by: Antoine Guenet <[email protected]>
Co-authored-by: Augustin (duau) <[email protected]>
Co-authored-by: Benoit Socias <[email protected]>
Co-authored-by: chdh-odoo <[email protected]>
Co-authored-by: Davide Bonetto <[email protected]>
Co-authored-by: Denis Rygaert <[email protected]>
Co-authored-by: divy-odoo <[email protected]>
Co-authored-by: emge-odoo <[email protected]>
Co-authored-by: fdardenne <[email protected]>
Co-authored-by: FrancoisGe <[email protected]>
Co-authored-by: Géry Debongnie <[email protected]>
Co-authored-by: Guillaume Jacquet <[email protected]>
Co-authored-by: Jinjiu Liu <[email protected]>
Co-authored-by: ksbh-odoo <[email protected]>
Co-authored-by: Louis (loco) <[email protected]>
Co-authored-by: Mohammed Shekha <[email protected]>
Co-authored-by: Nicolas Bayet <[email protected]>
Co-authored-by: panv-odoo <[email protected]>
Co-authored-by: paru-odoo <[email protected]>
Co-authored-by: Rahil Ghanchi <[email protected]>
Co-authored-by: Robin Lejeune (role) <[email protected]>
Co-authored-by: Rodolpho Lima <[email protected]>
Co-authored-by: Sanjay Sharma <[email protected]>
Co-authored-by: Sébastien Blondiau <[email protected]>
Co-authored-by: Sébastien Geelen <[email protected]>
Co-authored-by: Serhii Rubanskyi - seru <[email protected]>
Co-authored-by: Soukéina Bojabza <[email protected]>
Co-authored-by: Subhadeep <[email protected]>
Co-authored-by: visp-odoo <[email protected]>

…iles

Because when we change the link element in the popover and apply, we
always close the current one and open a new one, the loading at the apply
is redundant. We do the reopening to let the overlay plugin reposition popover,
and let browser handle the relative/root-relative url to add the domain.

Logo can have two views: image and a text one, and so
we pass the view of the one that's displayed right now.
Or, if the logo is hidden, we pass the image logo.

Before: In edit mode, creating an alert snippet would create an empty
new line at the begining of the snippet.