This adds a new Snailmail service that lets users send physical letters through Odoo using IAP credits. It also connects the feature to accounting workflows so invoices and related communications can be printed and mailed more easily, while fixing the credit purchase link used by the service.

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Odoo adds recurring email digests that summarize key business indicators and helpful tips for users. This gives teams a regular overview of activity across sales, CRM, invoicing, recruitment, projects, point of sale, and ecommerce, with links to act on the information directly.

Task: https://www.odoo.com/web?#id=30655&view_type=form&model=project.task&action=333&active_id=131&menu_id=4720
PAD: https://pad.odoo.com/p/r.3722b4787d88a30a9c3154e20ceabedd

- [x] New module: KPIs digest engine
- [x] Usable with Studio & custom fields
- [x] Implemented with 2 basic KPIs
- [x] Implementation for various apps

The dashboard documentation now explains the clickable attribute for aggregate values. This helps teams understand how dashboard metrics can link users to more detailed information when configured.

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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Accounting reports are now more flexible, with support for richer layouts and multiple action options in report lines. The update also adds a dynamic Sales/Purchase Journal report and strengthens report access checks so users only see company data they are allowed to access.

https://www.odoo.com/web#id=36590&view_type=form&model=project.task&action=333&active_id=967&menu_id=