Steps to reproduce:

1. Create a maintenance request with these values:

   * Maintenance Type: Preventive
   * Recurrent: enabled
   * Repeat Every: 1 day, forever
   * Scheduled Date: today
2. Confirm that an activity is created for the responsible user.
3. Mark the activity as done.
4. Move the request to `Repaired`, or another done stage.
5. Check the newly generated request in the recurring series.

When a recurrent maintenance request is moved to a done stage, Odoo creates the next request in the series.

The existing activity on the completed request is marked as done and automatically unlinked by `activity_feedback()`.

Previously, `activity_update()` was then called on all requests whose stage changed. Since the completed request no longer had a pending activity, this created a new one on that request.

The newly generated recurring request also received its own activity, resulting in one activity on the completed request and another on the new request.

Only call `activity_update()` for requests that remain in a non-done stage. This prevents a new activity from being created on a completed request while preserving the reminder on the next recurring request.

opw-6409396


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Forward-Port-Of: odoo/odoo#279470

**Description of the issue/feature this PR addresses:**

When using the POS in dark mode, certain form control elements display
black text on a dark background, making them illegible.

This occurred because the POS application lacked the `color-scheme` CSS
property. While the backend web client correctly applied this property,
its absence in the POS meant the browser still assumed a light theme, 
forcing default User Agent styles (black text) onto native form controls 
that escaped standard view helpers.

This commit resolves the issue by applying the `$o-webclient-color-scheme`
variable to the POS application. This signals the browser to render form
controls and UI elements based on the current web client color scheme,
ensuring text remains legible within the POS app.

**Steps to reproduce:**

- POS > Open Restaurant Register
  - Hamburger icon (top right) > Switch to Dark Mode
  - Register > vertical ellipses icon (bottom left) > Quotation/Order > type in the search bar > observe black text on dark grey background


**Current behavior before PR:**

<img width="1911" height="588" alt="Before 1" src="https://github.com/user-attachments/assets/99581745-23eb-45e1-96f7-bca78853369c" />
<img width="1919" height="550" alt="Before 2" src="https://github.com/user-attachments/assets/b7eb9726-e2d2-492b-ad2b-6c0cc6613bb8" />

**Desired behavior after PR is merged:**

<img width="1910" height="433" alt="After 1" src="https://github.com/user-attachments/assets/419b7a2a-234e-47c8-854e-22adf6a7c5c1" />
<img width="1915" height="513" alt="After 2" src="https://github.com/user-attachments/assets/8f1cf5c9-5ad1-4aac-9879-840d6d9d537e" />

opw-6508945

Forward-Port-Of: odoo/odoo#284831