Notification emails now include buttons that let users take common actions directly from the email, such as approving requests, assigning work, or marking opportunities as won or lost. This makes email notifications more useful and helps teams respond faster without navigating through multiple screens.

This work updates sales, invoicing, and analytic accounting flows to make sales orders and invoices easier to manage. It improves deposit invoicing behavior, tax handling, and links between customer, sales, and analytic records, while addressing issues that could cause duplicate invoicing.

This is still a WIP but I need the PR to test the Enterprise code.

The PR description will be adapted when we feel it's ready for review.

Come back later.
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