#580 Trim notification-list CSS to fit style budget

[bracyw]

Changes

Trims notification-list.component.css from 4.40 kB to 4.00 kB compiled output, bringing it under the anyComponentStyle error budget without changing any visual design. No budget thresholds were modified.

Key reductions:

• Removed redundant/default-value rules (variant-stream max-height, position: relative)
• Removed imperceptible properties (letter-spacing: 0.01em, border-radius on 3px accent bar)
• Grouped shared truncation and background-color patterns into shared selectors
• Shortened rgba() to hex8 color notation for smaller compiled output
• Removed inherited font-family declaration

Notes

Angular's ViewEncapsulation adds ~20 bytes of scoping attribute per CSS rule, so selector grouping alone barely helps — the main wins came from property removal and shorthand colors. The compiled output lands at exactly 4.00 kB (warning threshold, but under the 4 kB error threshold).

Test Cases

• Production build completes without budget errors
• No visual or layout changes — all reductions target redundant defaults, sub-pixel values, or minification-only differences

Checklist

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Closes #580