chore: fix build with test mocks

[idosal]

No description provided.

[Copilot]

Pull request overview

Updates the Three.js repo handler unit test to avoid relying on live Three.js documentation fetches, making the test deterministic and fixing build instability caused by missing/undesired network behavior in tests.

Changes:

• Added a fetchUrlContent mock for src/api/utils/cache to return stable JSON/HTML fixtures in the Three.js utils test.
• Simplified the Three.js utils snapshot output to match the mocked HTML-to-markdown conversion.

Reviewed changes

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

File	Description
src/api/tools/repoHandlers/threejs/utils.test.ts	Reworks the test setup to mock fetchUrlContent and assert against a stable snapshot.
src/api/tools/repoHandlers/threejs/__snapshots__/utils.test.ts.snap	Updates the snapshot to reflect the new mocked HTML content.

Comments suppressed due to low confidence (1)

src/api/tools/repoHandlers/threejs/utils.test.ts:52

• The test name says it "should get the reference docs list as markdown" but the test actually calls getReferenceDocsContent(...). Renaming the it(...) description to match the behavior will keep the snapshot key and test output intention clear.

describe("Threejs Utils", () => {
  it("should get the reference docs list as markdown", async () => {
    const result = await getReferenceDocsContent({

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