This update fixes a potential issue where the system was sending approval reminders even when no timesheets needed validation. The change ensures reminders are only sent when there are actual timesheets awaiting approval, streamlining the workflow and reducing unnecessary notifications for users.

prevent cron from sending approver reminder if no timesheet assigned to approver

Send the reminder email if:
- there are timesheets to validate
- AND if the user is set as either the manager or timesheet approver of an employee with timesheets left to be validated
- OR if the said employee has no manager or timesheet approver set


Task-3624610

Forward-Port-Of: odoo/enterprise#103587
Forward-Port-Of: odoo/enterprise#52355

This update fixes an issue where DHL labels were always delivered in PDF format, regardless of the user's selection. It also ensures that DHL error messages, such as 'Invalid Credentials,' are now properly displayed to the user, improving delivery troubleshooting. This enhancement provides a more reliable and informative DHL delivery experience.

This PR contains fixes for 2 issues:

1. Changing the label format in the Delivery Method has no effect, labels are always received in PDF format.
2. Some DHL errors (eg "Invalid Credentials") do not get propagated to the user, they get a "Validation Error" prompt with an empty message body.

opw-5423897

Forward-Port-Of: odoo/enterprise#103660

This update resolves an issue where non-administrator users were unable to validate direct debit mandates. The fix restricts access to the payment provider model during validation, aligning with the permissions granted to users who can create new mandates. This ensures all users with the necessary role can complete the validation process.

## Versions
saas-18.3+

## Issue
Non admin users get an access error when trying to validate a direct debit mandate.

## Steps to reproduce
As admin user:
- Navigate to "Users":
  - Select Marc Demo:
    - Under "Access Rights", in the "Accounting" section, set his "Accounting" role to "Invoicing & Banks";

As Marc Demo:
- Navigate to "Direct Debit Mandates":
  - Create a new mandate for Deco Addict and its first IBAN record;
  - Click on the "Validate" button.

## Cause
Issue introduced by the `action_validate_mandate` method override from b63eb2d6b91be28f4837309b5d972cc0b05846e0 Non admin users have no permissions on `payment.provider` while `_read_group` checks read rights on model via https://github.com/odoo/odoo/blob/ac084b1010faf49b63844ecc96284d567e59de2e/odoo/orm/models.py#L1632

## Fix
Allow `payment.provider` access only on mandate validation as only `account.group_validate_bank_account` users can create a new mandate.

opw-5255694

Forward-Port-Of: odoo/enterprise#103673

This update resolves a bug that occurred when generating reports for financial transactions with zero currency amounts (like currency exchange differences). The fix prevents a division-by-zero error, ensuring accurate reporting calculations. This improves the reliability of financial data for German-specific reports.

On move lines with zero `amount_currency` ( ex. currency exchange difference ), `_get_product_base_line_currency_rate` returns 0 currency rate which causes a division by zero error.

Ignore the rate for lines with zero `amount_currency`

opt-5358954

Forward-Port-Of: odoo/enterprise#105432
Forward-Port-Of: odoo/enterprise#105360