The user looked at the legend dashboard and saw 4/8 + 0/2 for the web
and mail buckets instead of the agreed 10/10. The hook's client-side
provisional limits were holdovers from an earlier sketch — 8/2 for
legend, 4/1 for free/pro — that never matched plan-features.ts on the
backend (5/5 and 10/10 respectively). Brought them in line so the
header counters read correctly until the API-driven values land via
the new GET /api/custom-domains response shape.
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