Migrated-names count for an Account (Portal/Manager migration progress)

[shrugs]

Sub-issue of #2035.

Context

The apps/manager migration flow (PR ensdomains/apps-monorepo#593) needs a count of "names this Account has successfully migrated from V1 → V2" to drive the dashboard's MigrationProgressBanner.

Why this matters

Without it, manager has to:

• keep hitting the V1 subgraph (a path PR Fix/changesets 21 #593 is trying to remove), or
• fan out per-name lookups across both V1 and V2 to compute the intersection client-side, or
• skip the progress banner entirely.

Related

• ensdomains/apps-monorepo#593 (consumer)
• apps/manager/src/features/migration/service/getMigratedNamesCount.ts (current legacy-subgraph implementation)

[coderabbitai]

🔗 Related PRs

#1654 - feat: implement canonical filter for findDomains [merged]
#1658 - ENSv2 API: Introduce Domain.subdomains [merged]
#1733 - ENSv2: Index ENSv1 Manager and Surface via API [merged]

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