Card - User assignment checkmark not highlighted when user is selected

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Describe the bug
The user assignment checkmark is not highlighted when a user is selected in the dropdown.

To Reproduce
Steps to reproduce the behavior:

1. Go to Deck
2. Click on a board (or create a new one)
3. Click on a card (or create a new one)
4. Click onto user assignment field
5. Assign a user to the card via left mouse click

Expected behavior
When a user is selected via left mouse click, I expect to get immediate feedback that the action was successful. Currently, the checkmark looks the same when the mouse is hovered over a user, no matter if the user is assigned or not assigned.

Potential solution
As a solution, I propose that the checkmark is displayed the same no matter if the mouse is over a user-entry or not. Currently, the checkmark is drawn bright when a user-entry is not selected, and dull, when a user-entry is selected.

Screenshots
User-entry is not selected, thus checkmark is drawn bright:

User-entry is selected, thus checkmark is drawn dull (here I would expect it to be drawn bright when the user is assigned):

Client details:

• OS: Windows 10
• Browser chrome
• Version Version 123.0.6312.59 (Official Build) (64-bit)
• Device: desktop

Start by reproducing the issue in Deck using the listed steps, then trace the frontend component that renders the card's user-assignment dropdown and checkmark. Compare the assigned and unassigned visual states; done means the checkmark provides immediate, consistent feedback when a user is assigned via left click.