cardGridLayout's only store dep was three grid-column constants it imported from
authStoreDefaults. Flipped ownership: the constants now live in lib/util/cardGridLayout
(pure layout config) and authStoreDefaults re-exports them (store→lib), so the auth
settings clamp/default and every existing consumer are unchanged. cardGridLayout is now
store-free and homes in lib/util alongside the other pure helpers — consumed cleanly by
ui/VirtualCardGrid + cover/layoutSizes. Resolves the documented store-free-lib block for
the card-grid layout helper. Pure move + constant relocation; tests pass unmodified.
Psychotoxical
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