[Python] How to add a custom view button next to Kanban/List/Calendar in Odoo 18 CRM module?

I'm working with Odoo 18, in the CRM module, and I want to add a custom button in the top-right view switcher (next to Kanban, List, Calendar, etc.), as shown in this screenshot:



What I want:

Add a button with a custom icon (e.g. fa-puzzle-piece)

When clicked, it should open a completely custom view (even a simple "Hello World" div is fine as a start)

I want to implement this properly using a custom Odoo module (not via JavaScript hacks or monkey-patching)


What I’ve tried:

I created a module that inherits the Kanban view and added a button to the view switcher, but it doesn't show up

I tried defining an ir.actions.client with a custom JS tag, but the view doesn’t load

I reviewed various tutorials and even used code generators, but nothing resulted in a working view button


All I need is a working minimal example that:

Adds a button to the view switcher

Opens a blank view (where I can later build my own logic)


I’ve read the Odoo documentation and inspected existing modules, but couldn't find a reliable reference.

Thanks in advance to anyone who can help clarify how this is done the “Odoo way”!

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