Steps to reproduce the bug:
- Create and Confirm a purchase order with any product and a description (name) on the order line
- Try to edit the description (name) field

Problem:
The description field was not editable on a confirmed purchase order when the product_id column was visible, but became editable when product_id was hidden.

The `ProductLabelSectionAndNoteField` widget renders both `product_id` and the description (`name`) in a single cell. When `props.readonly` is true (because `product_id` has `readonly="state in ('purchase', 'to approve', 'done', 'cancel')"`) and the order state is not draft (`isProductClickable` is true), the template rendered the description textarea with a hardcoded `readonly="1"` attribute, making it impossible to edit regardless of the actual intended readonly state for the description.

When `product_id` was column-invisible, the `name` field rendered via its own `section_and_note_text` widget, which correctly used `sectionAndNoteIsReadonly` (blocking only `cancel`, `done`, `posted`) hence the inconsistency.

Solution:
Replace `readonly="1"` with `t-att-readonly="sectionAndNoteIsReadonly"` on the description textarea so its editability follows the same logic as the other cases: blocked only for terminal states (`cancel`, `done`, `posted`), not for `purchase` or `to approve`.

opw-5474986

Forward-Port-Of: odoo/odoo#272102

## Issue
In the Timesheets app, the color of the *Time Spent* cell at the end of a row indicates the current status of the timesheets based on the expected number of working hours. The selected color (green/orange/red) is sometimes wrong when an employee has a work schedule with fractional hours.

## Steps to reproduce
1. Install *Timesheets* (`timesheet_grid`)
2. For an employee E, edit the *Standard 40 hours/week* schedule:
    - Change *Monday Afternoon* "Work to" column from 17:00 to 17:20.
3. In Timesheets > All Timesheets, go back one week and fill the timesheet for the employee E. We need 8 hours everyday but on Monday, where we need 8 hours and 20 minutes.
4. __The background of the *Time Spent* cell is orange, even though there's no overtime anywhere, and the value in the cell is precisely 40:20, which is the expected amount of hours worked.__

## Cause
When comparing the amount of hours worked and the expected amount of hours, small rounding errors occur. At this point of the execution:

https://github.com/odoo/enterprise/blob/19b7f5a6961dbce7367c07fcc55eea1925832634/timesheet_grid/static/src/views/timesheet_grid/timesheet_grid_renderer.js#L157

We obtain the following values:

```js
> monday = section.cells[1]

> monday.value
8.333333333333336

> workingHours[monday.column.value]
8.333333333333332

> monday.value - workingHours[monday.column.value]
3.552713678800501e-15
```

This small difference differing from 0, the wrong color is selected by `_getSectionTotalCellBgColor`:

https://github.com/odoo/enterprise/blob/19b7f5a6961dbce7367c07fcc55eea1925832634/timesheet_grid/static/src/views/timesheet_grid/timesheet_grid_renderer.js#L160-L172

## Fix
The same issue was fixed elsewhere by https://github.com/odoo/enterprise/commit/3340c0610ae6d7d3087f20da04309512771cc4b7. The same fix is applied here for consistency.

opw-6193181

Forward-Port-Of: odoo/enterprise#121463