Date transformers not generated for collection endpoints using `$ref`

[ploca14]

Description

Description

Date transformers are not generated for collection endpoints, when:

1. Collection items use $ref to reference component schemas (not inline schemas)
2. The same schema component IS transformed correctly when used directly

Expected Behavior

The same schema component (UserMatch.jsonld-match.collection.read) IS transformed correctly when used directly:

• Single-item endpoint (/api/admin/{company}/matches/{id}/{kind}) → transformer generated
• Collection endpoint (/api/admin/{company}/matches) → transformer NOT generated

Generated code:

export function getAdminCompanyMatchesIdKind(...) {
  return client.get({
    responseTransformer: apiAdminCompanymatchesIdKindGetResponseTransformer,
    url: '/api/admin/{company}/matches/{id}/{kind}',
  })
}

export function listAdminCompanyMatches(...) {
  return client.get({
    // responseTransformer: MISSING
    url: '/api/admin/{company}/matches',
  })
}

Actual Behavior

1. TypeScript types claim dates are Date: lastMessageSentAt?: Date | null
2. Runtime data has dates as strings (JSON doesn't have Date types)
3. Code expecting Date objects fails at runtime (e.g., calling .getTime() on a string)

Reproducible example or configuration

https://stackblitz.com/edit/hey-api-client-fetch-example-a95akxjr?file=repro-client%2Fsdk.gen.ts

OpenAPI specification (optional)

No response

System information (optional)

No response

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• hey-api-client-fetch-example-a95akxjr (Open reproduction)