Wrong icon color in app overview (light-mode)

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Steps to reproduce

1. Install Paperless

Expected behaviour

The app icon color is visible on white background.

Actual behaviour

The app icon is NOT visible because it is white on white background.

Server configuration

Web server: Nginx

Database: PostgreSQL

PHP version: 8.2

Nextcloud version: 31.0.13

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Browser

Browser name: Firefox

Browser version: 147.0.3

Operating system: Fedora Linux

Insert your browser log here, this could for example include:
a) The javascript console log
b) The network log
c) ...

Reproduce the issue by opening the Paperless app overview in Firefox with light mode enabled and inspect the icon asset or styling used there. Confirm the icon is visible against a white background while preserving its appearance in other modes; no source file or test is identified in the issue.