Sales order lines for down payments now include the related invoice reference and date instead of only showing a generic “Down payment” label. This makes it easier for users to distinguish multiple down payments on the same sales order and reduces confusion during review or follow-up.

When a SO has several down payment, they all have the exact same description "Down payment" which does not provide much information.

This commit adds the invoice reference and the date.

task-3299805

Project milestones now always show the tasks button, even when no tasks exist yet, making it easier for users to create tasks right away. Completed or cancelled tasks also no longer make milestone dates appear overdue, reducing confusion in project tracking.

Purpose of the commit is to do the generic improvements for project.

So in this commit did the following changes:
- display 'tasks' stat button even if there are no records
- the milestone should not be displayed in red if the task has been completed/cancelled

task:3251634

Employee records now keep a clearer history when an employee's department changes. This makes it easier for HR teams and managers to understand organizational movement over time and audit past updates.

task-3373484

Project configuration now automatically uses the Project analytic plan by default, making project-related reporting setup more consistent. The setting label was also clarified so users can better understand which analytic plan applies to projects.

In this commit we change following points:
  - move the analytic plan project from demo to data.
  - changed string of analytic_plan_id field in res setting.
  - project set as default in the analytic plan of the project setting

task-3251642

When users open budget positions from the Project app, the view no longer groups entries by analytic account by default. This makes the budget screen less cluttered and easier to scan for project-related work.

In this commit,
  when we opening the budget position from the project app, we have
  removed the default analytic account group.

task-3251642