This update enhances the synchronization of point-of-sale (POS) transactions with Fiskaly, our payment processing partner. It separates flows for retail and restaurant orders, ensuring more accurate and timely updates are sent, particularly during kitchen synchronization for restaurants. This improves the reliability of financial reporting.

In this commit:
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- Maintain separate Fiskaly transaction flows for retail (short tx) and restaurant (long tx)
  orders as discussed with the Fiskaly team.
- `Initialize order transactions` with an empty payload when the `first product` is added.
- Start `receipt transactions` with an empty payload when the `first payment line` is added.
- For retail flows, no intermediate order updates are sent to Fiskaly before finalization.
- For restaurant flows, create additional transaction updates during kitchen synchronization.
  Ensure already synchronized products are not resent, and only newly added or updated
  quantities are included in the payload.
- `Finalize order and receipt transactions` with complete order lines and payment details
  when we validate the order.

task: 6208963

Reference:
<img width="1863" height="1285" alt="de_tss_flow" src="https://github.com/user-attachments/assets/9140788e-7948-4a08-9f11-27197b22ca8b" />

Forward-Port-Of: odoo/enterprise#119912
Forward-Port-Of: odoo/enterprise#117526

This update enhances the Point of Sale system by allowing more flexible formatting and parsing of order quantities within the decrease quantity popup. This change enables other modules to enforce quantity constraints, like preventing negative values, improving overall order accuracy and data integrity.

We now allow formatting and parsing quantity on an orderline when using the decrease quantity popup.
This allows overriding from other modules to add contraints (e.g. `pos_blackbox_be` prevents from setting negative quantities).

see odoo/enterprise#119702
task-5942777

Forward-Port-Of: odoo/odoo#269487

This update enhances the visual appearance of both customer receipts and preparation tickets within the Point of Sale system. Specifically, font styling has been improved and floor information is now displayed alongside table numbers on preparation tickets, providing clearer details for staff.

In this commit -
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Enhanced font styling for receipt and preparation ticket Added floor information next to table number on preparation ticket

Task - 6125322



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Forward-Port-Of: odoo/odoo#260559

This update enhances the visual appearance of Odoo invoices generated through the account_edi_ubl_cii module. The changes include a refined header and footer, a confirmation message indicating the document was created by Odoo, and a disclaimer stating it's not an official document. These improvements contribute to a more professional and user-friendly experience for our clients.

The previous UI was a little bit raw. To improve the client experience, we made the following changes:

- Modify an inherited internal layout to improve header and footer.
- Add a pill that says "Generated by Odoo".
- Add a sentence mentioning that it is not an official document.

Task-6132980

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Forward-Port-Of: odoo/odoo#260393