PDF slides with only one page no longer show unnecessary navigation buttons. This makes embedded course content cleaner and avoids confusing learners with controls that do not apply.

task: https://www.odoo.com/web#id=12790&view_type=form&model=project.task&menu_id=3942&action=327
pad: https://pad.odoo.com/p/r.0IdACyLDfChHINKW

Fixed a navigation menu issue where submenu arrows could point the wrong way after reloading a page. Parent menu items also keep the correct selected state when users expand or collapse sections, making navigation clearer and less confusing.

[FIX] web : Menu arrow show the wrong direction when you are into sub-menu and reload the page.
[FIX] web : `active` class is removed when you click on parent menu item for collapsing/Expanding menu.

TASK : https://www.odoo.com/web#id=12619&view_type=form&model=project.task&menu_id=3942&action=327
PAD : https://pad.odoo.com/p/r.7htDjDXPWv9HYLXV

The Aged Partner Balance screen was adjusted to remove an unnecessary list-style view option. This reduces confusion and keeps the accounting report focused on the intended way users should access it.

The view Aged Partner Balance does not need a tree view.

opw:633116

This change migrates Odoo's mail-related functionality to a newer internal API across several business apps. It helps keep communication features maintainable and consistent in areas such as CRM, HR, accounting, recruitment, calendars, and expenses, with limited direct impact on day-to-day users.