The /lab profile card and /stats Top Mappers were overflowing off the right
edge: Tailwind `grid md:grid-cols-2` (no base column) renders one implicit
`auto` track on mobile that can exceed the container when a name is long, so the
whole card got pushed off-screen. Added the base `grid-cols-1` repo-wide (plus
`min-w-0` on truncating flex/grid children).
/stats also gained a "Top Shops — most shops added" leaderboard (kind 30017)
beside Top Mappers (spots): `topShops` in useGrowthStats, a generalized
MapperRow (count + unit), and EN/ES copy. PERSIST_BUSTER → v6 (new persisted
field).
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