Match the existing DomainSection visual pattern. One row at the top:
title "Eigene Filter", inline Web/Mail legend dots, the X/Y count pill
and a small + button — all on the same line. The bar drops below at
5px height (same as DomainSection). The 48×48 floating add button is
gone in favour of a 28×28 inline button next to the count pill so the
overview reads as a single horizontal strip rather than a tall card.
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