This update adjusts how Odoo retrieves related records across several accounting, approvals, data cleaning, and helpdesk features. The change supports ongoing platform compatibility work and should help keep these workflows reliable without changing day-to-day user behavior.

odoo/odoo#185630
task-4139293

The mobile user menu tests were moved to a newer testing approach. This helps maintain confidence in the mobile interface while making future updates easier for the development team.

task-4028335

This update standardizes how session information is accessed, making it behave more like a regular dictionary. It affects appointment-related flows and helps keep future development more predictable while preserving key frequently used shortcuts.

The session must be used like a "classic" dictionnary. Only very frequently used keys will be accessible
via a property.

task-3305304

The PDF viewer used for signing and document previews now hides built-in buttons that were unnecessary or could cause confusion. This creates a more consistent, focused experience when users review or sign documents.

The native viewer of PDF.js adds some buttons that we don't want as useless or problematic.

This commit aims to uniformize add remove these buttons.

task-4286512

This change restores the previous internal model naming approach after a related typing initiative was canceled. It helps keep the system aligned with established Odoo conventions without introducing functional changes for end users.

Following internal discussions, the python typing and inheritance task is canceled. The use of the class name instead of '_name' was done to allow notations such as `partner_id = fields.Many2one[base.ResParter](string='Partner')`. Since this notation is canceled, we put `_name` back (although the class name is sufficient).

Partial revert:
https://github.com/odoo/enterprise/pull/69762
https://github.com/odoo/odoo/pull/178200

**Before this PR:** Dragging and dropping documents from the TRASH to another folder will result in a traceback or user error. Dragging and dropping documents within the TRASH will trigger an unusual notification. **After this PR:** Disable dragging in the TRASH folder and inform the user with a valid reason. Task-4231709 Forward-Port-Of: odoo/enterprise#71633

**Before this PR:**

Dragging and dropping documents from the TRASH to another folder will result in a traceback or user error.
Dragging and dropping documents within the TRASH will trigger an unusual notification.

**After this PR:**

Disable dragging in the TRASH folder and inform the user with a valid reason.

Task-4231709

Forward-Port-Of: odoo/enterprise#71633

We have 2 errors in the generation of report "Certificado de Retencion de la fuente" General setup: - With a CO Company - Open Vendor Journal and disable the "Electronic Invoice: DIAN 2.1" check - Create a Vendor Bill with a VAT 19% Tax and "4% RteFte S L", add bill date and confirm **Error 1** Go to Reports -> Certificado de Retencion de la fuente Error will raise ``` psycopg2.errors.UndefinedFunction: operator does not exist: text ->> unknown LINE 14: ...R || ' ' || "account_mo

We have 2 errors in the generation of report "Certificado de Retencion de la fuente"

General setup:
- With a CO Company
- Open Vendor Journal and disable the "Electronic Invoice: DIAN 2.1" check
- Create a Vendor Bill with a VAT 19% Tax and "4% RteFte S L", add bill date and confirm

**Error 1**
Go to Reports -> Certificado de Retencion de la fuente

Error will raise
```
psycopg2.errors.UndefinedFunction: operator does not exist: text ->> unknown
LINE 14: ...R || ' ' || "account_move_line__account_id"."name"->>'en_US'...
                                                              ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.
```

**Error 2**
Enable and activate language "Spanish (Latin America)"
Go to Reports -> Certificado de Retencion de la fuente
Expand the partner for which the vendor was crated, click on PDF

Error will raise
```
psycopg2.errors.UndefinedTable: missing FROM-clause entry for table "aa"
LINE 21:                 GROUP BY rp.id , aa.id
```

opw-4284787

Forward-Port-Of: odoo/enterprise#72918

Steps to reproduce: - Insert a non-odoo pivot - Add a formula with `=PIVOT.VALUE` or `PIVOT.HEADER` - Try to autofill => Traceback This commit fixes the issue by disabling the autofill for non-odoo pivots, as the autofill is not supported for them. Task: 4277518 Forward-Port-Of: odoo/enterprise#72564

Steps to reproduce:
- Insert a non-odoo pivot
- Add a formula with `=PIVOT.VALUE` or `PIVOT.HEADER`
- Try to autofill

=> Traceback

This commit fixes the issue by disabling the autofill for non-odoo pivots, as the autofill is not supported for them.

Task: 4277518

Forward-Port-Of: odoo/enterprise#72564