Adds a breadcrumb in full-screen chat so users can quickly return to the related document without losing their place. This makes navigation smoother when reviewing or discussing business records from chat.

Description of the issue/feature this PR addresses:

Task : https://www.odoo.com/web#id=31767&view_type=form&model=project.task&action=327&menu_id=4720
Pad : https://pad.odoo.com/p/r.a6b7946f0a9109c51f5752a834bd0d12

Current behavior before PR:

Desired behavior after PR is merged:


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UPS delivery methods can now offer Collect on Delivery and Saturday Delivery where the selected UPS service supports them. This gives businesses more checkout and fulfillment flexibility, including COD payment instrument choices without allowing cash.

Task: https://www.odoo.com/web#id=23012&view_type=form&model=project.task&action=333&active_id=131&menu_id=4720
Pad: https://pad.odoo.com/p/r.6fb51931d72c2a0dbc6895c1929cc80d

The project planning Gantt view now displays approved employee leave directly on the schedule, helping managers spot availability conflicts when planning work. The underlying Gantt view was also refactored to make future planning extensions easier and more reliable.

task: https://www.odoo.com/web#id=21441&view_type=form&model=project.task&action=327&menu_id=
pad: https://pad.odoo.com/p/r.625b2a0ff2bbfa5cd4a6fc07a64c6f05

This change adds a new project forecast leaves module so planned employee absences can appear directly in Gantt planning views. It also restructures the Gantt view internals to make future extensions easier and adds task tooltips, improving planning visibility for project managers.

Task: https://www.odoo.com/web#id=21441&view_type=form&model=project.task&action=333&active_id=131&menu_id=4720
pad: https://pad.odoo.com/p/r.625b2a0ff2bbfa5cd4a6fc07a64c6f05