FS.com changed their HTML structure; compound class names are gone.
Current layout (verified 2026-05-06):
<div class="no_tax">5,10 € ohne MwSt.</div> ← B2B net price (preferred)
<div class="price">6,07 €</div> ← gross fallback
<div class="standard_price">6,07 €</div> ← gross fallback
Old selectors ([class*='price-value'] etc.) matched nothing → all prices
stored as €? null. New .no_tax first gives us the correct net/B2B price.
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