Adding a built-in popular catalog (e.g. Project Gutenberg) to My Catalogs
left it still rendering in the Popular Catalogs section, so it looked like a
duplicate. Only the card's Add button was hidden; the card itself stayed.
Filter added (and disabled) entries out of the Popular list entirely via a
new pure helper getUnaddedPopularCatalogs, which matches by normalized URL
(trim + lowercase) to mirror the store's findByUrl dedup. The section already
auto-hides when the list is empty, so it disappears once all are added.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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