When switching companies in a Frontdesk station and opening the kiosk URL, the company logo does not appear.

**Steps to produce:**
- Install the `frontdesk` module.
- Ensure the database has at least two companies, each with a logo configured.
- `Enable multi-company` access (user has access to all companies).
- Open any Frontdesk station configuration and change the company to one different from the currently active company.
- Copy the kiosk URL and open it in an incognito/private window.
- The kiosk opens, but the company logo is missing.

**Issue:**
- Company logo not comes on frontdesk kiosk.

**Root cause:**
- When the kiosk URL is accessed, Odoo logs an `Access Denied by record rules`.
- This happens because the selected company on the station is not included in the `Public User’s companies`.
- As a result, the public user cannot read the company record, so the logo does not load.

**Solution:**
- Added an `onchange` on `company_id` to automatically include the selected
 company in the Public User’s `company_ids` if it is not already present.
- This ensures the kiosk always has access to correct company record and logo.
- Also added an XML-side fix to prevent an access error that occurs when
  a company is not activated and we attempt to select it in the company field.

**Before:**
<img width="500" height="500" alt="frontdesk_image_before" src="https://github.com/user-attachments/assets/b002ac6e-5271-4561-bf03-542a3feeefd1" />

**After:**
<img width="500" height="500" alt="frondesk_image_after" src="https://github.com/user-attachments/assets/7b5bffe4-ccbf-48f5-ad9c-d5e6d2e7678e" />

**opw-5138980**

Forward-Port-Of: odoo/enterprise#100300