[http-server-csharp] Import JsonNodes for record arrays

[nightcityblade]

Fixes #11733.

Summary

• unwrap array element types before checking whether a model property maps to JsonObject
• keep the existing Record<unknown>-only behavior, including for nested arrays
• add focused coverage for nested Record<unknown> arrays and typed record arrays

This ensures generated models using Record<unknown>[] import System.Text.Json.Nodes, while Record<string>[] continues to use dictionary types without that import.

Verification

• pnpm --filter @typespec/http-server-csharp exec vitest run src/components/models/models.test.tsx (6 passed)
• pnpm --filter @typespec/http-server-csharp lint
• pnpm --filter @typespec/http-server-csharp build
• pnpm exec prettier --check packages/http-server-csharp/src/components/models/model-helpers.ts packages/http-server-csharp/src/components/models/models.test.tsx

AI-assisted; I reviewed the change and verified the commands above locally.

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[Copilot]

Pull request overview

Fixes a bug in the @typespec/http-server-csharp emitter where models containing Record<unknown>[] (including nested arrays) could emit JsonObject[] without adding the required System.Text.Json.Nodes using, causing generated C# to fail compilation.

Changes:

• Update modelNeedsJsonNodes to unwrap array element types before checking for Record<unknown>.
• Add a focused unit test ensuring Record<unknown> nested in array properties is detected (and Record<string>[] is not).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/http-server-csharp/src/components/models/model-helpers.ts	Unwrap nested array types in modelNeedsJsonNodes so Record<unknown>[] triggers System.Text.Json.Nodes imports.
packages/http-server-csharp/src/components/models/models.test.tsx	Adds test coverage for Record<unknown> nested in arrays and ensures typed record arrays don’t trigger JsonNodes.

---

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npm i https://pkg.pr.new/@typespec/http-server-csharp@11796

commit: ecc93a0

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All changed packages have been documented.

• ✅ @typespec/http-server-csharp

Show changes

@typespec/http-server-csharp - fix ✏️

Import JsonNode collection types when generating models containing record arrays.

[nightcityblade]

Added the required Chronus change description in the latest commit. pnpm exec prettier --check and pnpm chronus verify both pass.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.