Light theme forced

**Describe the bug**
-
After updating from 2025.4.4 to 2025.6.4 the application reverted back to the light theme. I have set settings.theme.base to dark in my user attributes. This is documented at https://docs.goauthentik.io/docs/customize/interfaces/user/customization#settingsthemebase.

**To Reproduce**
-
Steps to reproduce the behavior:

1. Install authentik 2025.4.4
2. Add the following to user attributes:
```
settings:
theme:
base: dark
```
3. Upgrade to 2025.6.4
4. The web interface is now displayed in light mode

**Expected behavior**
-
The web interface is displayed in darkmode

**Screenshots**
-

**Version and Deployment (please complete the following information):**
-

- authentik version: 2025.6.4
- Deployment: docker-compose