Assignment checkbox having incorrect style

## Description

When checked, the assignment checkbox should have:
- White text color
- A white background
- A checkmark with FccColors `gray90` (FccTheme `primaryColorDark`)

<details>
  <summary>Screenshots</summary>

  | Mobile | Web |
  | --- | --- |
  | <img width="411" alt="Image" src="https://github.com/user-attachments/assets/1c241842-1979-4546-8076-66010fbe6446" /> | <img width="772" alt="Image" src="https://github.com/user-attachments/assets/d83150e2-7458-408e-92de-ddc04ceee9df" /> |
</details>

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Assignment checkbox having incorrect style #1503

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Uh oh!

Assignment checkbox having incorrect style #1503

Description

Description

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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