test(ui): cover createQueryFn against a live server

[sysadmind]

createQueryFn in ui/mantine-ui/src/data/api.ts builds every API request the Mantine
UI makes — URL construction, query parameter encoding, envelope unwrapping, and error
translation — and has no test coverage today.

This exports it and adds 17 tests that run against an ephemeral node:http server
rather than a mocked fetch. Per @SoloJacobs's feedback on #5128, avoiding fetch
mocks keeps the assertions honest about real status codes and real JSON parse failures.

No production behavior changes; the only non-test edit is the export.
This is the "test api.ts first" half of #5128. The silences datasource tests will be
rebased onto this harness separately.

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Which user-facing changes does this PR introduce?

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📝 Walkthrough

Walkthrough

The PR exports createQueryFn from api.ts and adds live HTTP tests for its response parsing, error handling, abort behavior, URL construction, query parameters, and timing callback.

Changes

Query Factory API

Layer / File(s)	Summary
Query factory contract and HTTP behavior validation ui/mantine-ui/src/data/api.ts, ui/mantine-ui/src/data/api.test.ts	createQueryFn is now exported. Tests cover successful and error responses, malformed JSON, unreachable and aborted requests, query-string construction, API path placement, and response-time callbacks.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

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Merge Risk: ⚪ Minimal · up to 8ba14

This change adds the query factory export and HTTP tests without an established user-facing regression. The configured test runtime supports the teardown API, so no specific issue remains to block merging.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly identifies the UI test change and the createQueryFn target. It is concise and follows the repository's area: short description format.
Description check		The description clearly explains the export, test coverage, test approach, issue context, lack of production behavior changes, and absence of user-facing changes. It includes the required release-note…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@ui/mantine-ui/src/data/api.test.tsx`:
- Line 123: Update the unreachable endpoint used by createQueryFn in the test to
use http://127.0.0.1:0 instead of port 1, preserving the test’s expected
network-error behavior.

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[SoloJacobs]

Thanks 👍 Pretty solid. Should we change the file name to .ts?