fix(runtime-utils): mockNuxtImport sourcemap mapped position

[yamachi4416]

🔗 Linked issue

resolves #1786

📚 Description

reproduction:
https://stackblitz.com/edit/nuxt-test-utils-issues-1786?file=package.json

AssertionError: expected 1 to be 999 // Object.is equality

- Expected
+ Received

- 999
+ 1

 ❯ test/nuxt/repro.test.ts:10:15
      8| describe('non-working example', () => {
      9|   it('source line numbers are incorrect when mockNuxtImport is called', () => {
     10|     expect(1).toBe(999)
       |               ^
     11|   })
     12| })

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@nuxt/test-utils@1787

npm i https://pkg.pr.new/vitest-environment-nuxt@1787

commit: c280f1b

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f6e51939-69de-42a0-a614-b4c23da60065

📥 Commits

Reviewing files that changed from the base of the PR and between debaf18 and c280f1b.

📒 Files selected for processing (2)

• src/module/plugins/mock.ts
• test/unit/mock-transform.spec.ts

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📝 Walkthrough

Walkthrough

The mock plugin now generates high-resolution source maps in its Vite transform hook. Unit tests now resolve transformed code with source maps and verify generated and original positions for import-mocking and component-mocking scenarios.

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

Merge Risk: ⚪ Minimal · up to c280f

This PR corrects the mapped source position for mockNuxtImport with localized implementation and test changes. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the source-map position fix for mockNuxtImport and accurately reflects the main change.
Description check	✅ Passed	The description explains the source-map defect, links issue #1786, and provides a reproduction of the incorrect assertion position.
Linked Issues check	✅ Passed	The change enables high-resolution source maps and adds position checks for mocked imports and components, addressing issue #1786.
Out of Scope Changes check	✅ Passed	All changes support the source-map fix or its tests, with no unrelated code or behavioral changes identified.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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