The Helpdesk onboarding tour has clearer guidance and additional steps that introduce the chatter area. This helps new users better understand key collaboration features while removing an unnecessary priority-setting step.

Added a few steps, removed the ticket priority step and revised some steps on
the helpdesk app existing tour.

Task-ID: 2527334

Accounting chart setup has been streamlined so company account structures can be generated faster from templates. This reduces implementation time for localized accounting configurations, with benchmarked installation time improving by about 25%.

Add a generic optimized way to create records from templates.
It reduces the number of lines of code and speedup the COA installation.

Performance Analysis:
Benchmark: l10n_es full COA
730 accounts
24 fiscal positions
91 taxes
930 account groups

Before commit: 3.43s in average
After commit: 2.63s in average
Speed up: +-25%

task: 2379123

The Gantt view was optimized to load and update planning rows more efficiently, improving responsiveness for users working with schedules. It also adds an option to disable drag-and-drop changes, giving businesses more control over how plans are edited.

https://github.com/odoo/odoo/pull/70840
https://github.com/odoo/documentation/pull/976

Payment-related automated tests were adjusted so they no longer depend on sample demo data. This helps keep company configuration consistent during testing, reducing false failures and improving confidence in payment functionality.

- This makes tests independent of any demo data and ensures the company configuration is always consistent.

The spreadsheet pivot autofill logic has been separated from the pivot structure logic, making the code easier to understand and maintain. This internal cleanup should reduce future development complexity without changing how users interact with spreadsheets.

Currently, the `PivotStructure` plugin is 1.2k LoC in which it's not easy
to navigate.

One can see that the plugin has two responsabilities:
- pivot structure
- pivot autofill

Those responsabilities are independent, no attribute nor method are shared.
This commit moves all autofill logic in a separate plugin.
This makes two smaller plugins which are more focused and easier to hold in
one's head.

Forward-Port-Of: odoo/enterprise#18304 Forward-Port-Of: odoo/enterprise#18138

Forward-Port-Of: odoo/enterprise#18304
Forward-Port-Of: odoo/enterprise#18138

The dependency on `l10n_generic_coa` is useless and have the side effect to set the Genric CoA on company 1, which cause problems while upgrading this test module in future versions. Forward-Port-Of: odoo/enterprise#18350

The dependency on `l10n_generic_coa` is useless and have the side
effect to set the Genric CoA on company 1, which cause problems while
upgrading this test module in future versions.

Forward-Port-Of: odoo/enterprise#18350

Forward-Port-Of: odoo/enterprise#18251 Forward-Port-Of: odoo/enterprise#18102

Forward-Port-Of: odoo/enterprise#18251
Forward-Port-Of: odoo/enterprise#18102

- Use a company using USD as currency - In Accounting, activate "Multi-Currencies" - Configure currency rates as followed: * EUR - 01/01/2021 - 1.0 * USD - 01/01/2021 - 1.2834 * USD - 01/05/2021 - 1.38 - Create an invoice in EUR with an invoice line of 100€ and an invoice date between 01/01/2021 and 01/05/2021 (i.e. 01/03/2021) - Create a payment for 99€ and keep the remaining 1€ open with payment date set at current date (i.e. 06/05/2021) - Go to Accounting > Reporting > Age

- Use a company using USD as currency
- In Accounting, activate "Multi-Currencies"
- Configure currency rates as followed:
  * EUR - 01/01/2021 - 1.0
  * USD - 01/01/2021 - 1.2834
  * USD - 01/05/2021 - 1.38
- Create an invoice in EUR with an invoice line of 100€ and an invoice date
  between 01/01/2021 and 01/05/2021 (i.e. 01/03/2021)
- Create a payment for 99€ and keep the remaining 1€ open with payment date
  set at current date (i.e. 06/05/2021)
- Go to Accounting > Reporting > Aged Receivable
The invoice with the remaining unpaid 1€ does not appear in the report.
The payment is displayed instead with a negative value.

This is due to the difference of currencies rates between the invoice date
and the payment date.
Even though the amount of the payment (99€) is lower than the amount of the
invoice (100€), the converted amount in USD is greater.
As the report only takes into account converted values, it cannot handle
these cases with different currency rates.

To handle these cases, the report will use the currency amount (in the
original currency) when all account move lines use the same currency that
is different from the company currency.

opw-2514319

Forward-Port-Of: odoo/enterprise#18357
Forward-Port-Of: odoo/enterprise#18173

Following the recent reorganisation of the documentation in 12.0+, the majority of the documents have been moved and their old links are no longer valid. Some redirection rules will soon be deployed, but those rules might be dropped in some years and we want the links to still work, which is why we still replace the links to the new ones. FW-port of #18270 (13.0) Forward-Port-Of: odoo/enterprise#18354 Forward-Port-Of: odoo/enterprise#18281

Following the recent reorganisation of the documentation in 12.0+, the majority
of the documents have been moved and their old links are no longer valid.

Some redirection rules will soon be deployed, but those rules might be dropped in some
years and we want the links to still work, which is why we still replace the links to the
new ones.

FW-port of #18270 (13.0)

Forward-Port-Of: odoo/enterprise#18354
Forward-Port-Of: odoo/enterprise#18281