Quote: Custom distributor not displayed in right sidebar after selection

When a custom distributor is set as the selected distributor on a quote, the right sidebar continues to show "No distributor selected" instead of reflecting the chosen custom distributor. Standard (non-custom) distributors display correctly.

Steps to reproduce:

1. Open a quote

2. Select a custom distributor

3. Check the right sidebar V

4. click the product and see that there is a distributor selected

Expected behavior:

The right sidebar shows the name of the selected custom distributor.

Actual behavior:

The right sidebar shows "No distributor selected" even though a custom distributor has been chosen.

Impact:

Medium — users cannot confirm their distributor selection via the sidebar, which may lead to errors or repeated attempts to set it.