Vendor bills no longer let users create a new purchase order from the “Add Purchase Order” field, reducing accidental purchase order creation during billing. The purchase order status and action wording are also clarified by renaming “Done” to “Locked” and “Set to Done” to “Lock Bills,” making it clearer that future bills are blocked for that order.

On the field 'Add Purchase Order' on vendor bills, don't allow the
user to create a new purchase order.

The button 'Set to Done' is not clear. This button will prevent the
creation of new invoices for this purchase order. Done is not a 'final'
state and the naming is not clear. Fp proposes to rename the state
'Locked' and the button 'Lock Bills'.

Installing or upgrading apps now takes users directly back to the App Switcher instead of showing many setup reminder screens. This streamlines the post-install experience and removes obsolete setup prompts across several apps and localizations.

After installing or upgrading apps, users are now taken back to the main App Switcher automatically instead of being sent through setup checklist actions. This streamlines the post-install experience and removes redundant setup prompts across several apps.

And jump to the App Switcher automatically on module install/upgrade.
That way, we can remove a lot of ir.actions.todo in the code.

The inventory-related code was reorganized into smaller, clearer files, with some dead or suspicious code removed along the way. This should make the stock and manufacturing-sales areas easier to maintain without introducing major business-facing changes.