This update aligns the HR Referral applicant area with improved checks for whether users can access specific fields. It helps ensure the application respects field visibility rules more consistently, reducing the risk of users seeing or interacting with information they should not access.

task-4331116
odoo/odoo#186908

US regular payroll calculations can now include employee bonuses and approved expenses directly in payslips. Bonuses are treated as taxable income before taxes, while expenses are added after taxes, helping payroll teams handle these common payments more accurately.

Add `Bonus` input type to `United States Regular Pay Salary Structure`.
Use `Expenses` and `Bonus` input types in the computation of payslips.

* Expenses:
    * Allows users to include expenses (added automatically from the Expenses app) into the salary calculation when using the Structure Type "United States: Regular Pay". The rule is  placed post taxes in the structure.

* Bonus: 
    * Add an Input type in "hr.payslip.input.type" called `Bonus`.
    * "Bonus" allows users to add an extra source of income for employees that have associated the "United States: Regular Pay" Structure type in their payslip. The rule is placed pre-taxes in the structure, it is a taxable amount.

task-4097635

Spreadsheet cell data is now saved in a simpler format, reducing exported file sizes significantly. This can make spreadsheet dashboards and document-related spreadsheet operations faster and lighter to store or transfer.

Payroll now shows warnings for untrusted employee bank accounts directly in the standard payroll app instead of only in the SEPA payroll extension. This helps all payroll localizations spot potentially unsafe payment details before processing salaries.

This will move the warning for untrusted bank accounts from the sepa module to standard payroll so that it's available for all localisations.

Task: 4023575

The referral module now includes a reward report that helps review rewards earned by employees for successful referrals. This gives businesses clearer visibility into referral program performance and employee incentives.

This PR improves the referral module's report by adding a reward report that evaluates the data of rewards earned by employees for successful referrals.

task-3946561

The Discuss app has been visually softened to reduce harsh contrast, especially in dark mode. This makes conversations easier on the eyes with gentler colors, lighter separators, fewer borders, and more comfortable sidebar spacing.

This update enhances the Gantt chart's usability by introducing a dynamic range toggle and a quarter view option. This allows users to switch between static and dynamic views, providing greater flexibility for managing projects with varying task durations, particularly on longer-term initiatives.

This PR is meant to use the standard dynamic range option in gantt
view and allow one to go from static to dynamic view by ticking only one
button and selecting a date.

This PR adds quarter scale in gantt view to add granularity between
month and year view.

Since year view is very static and based on month-step, the view is not
really useful for tasks with heterogeneous durations on long-term projects.
The quarter view, added to the dynamic toggle option gives a more smooth
experience of the gantt view.

Forward-port of https://github.com/odoo/enterprise/pull/50340