Fix notification-list component CSS exceeding style budget

[bracyw]

Observed Behavior

The Docker build for angular-client fails on CI because notification-list.component.css (4.40 kB) exceeds the anyComponentStyle error budget of 4.00 kB configured in angular.json. The build exits with:

src/components/notification-list/notification-list.component.css exceeded maximum budget. Budget 4.00 kB was not met by 399 bytes with a total of 4.40 kB.

Introduced by PR #556 (notification log feature).

Expected Behavior

The production Docker build should complete successfully. All component stylesheets should stay within the 4 kB error budget.

Steps to Reproduce

1. Push to develop (or any branch that triggers the client Docker build)
2. The build step npm run build:production fails at the budget check