validateDomain returns isValid: true for CDN-fronted domains but reuses
the `error` field to carry the provider's informational warning. Both
domain tooltips branched on `error` alone, so the message rendered under
a red "Error:" heading even though the badge correctly showed a green
"Behind Cloudflare" state.
Check the valid+message case first, matching how the badge already
distinguishes the two. Applied to both the table view (columns.tsx) and
the card view (show-domains.tsx), which shares the same tooltip.
Fixes#4910
Co-Authored-By: Claude Opus 5 <[email protected]>
