LIG-10251 Test grouped sample-tag counts hook

[ikondrat]

Summary

• test complete grouped-count request construction
• verify ordered sample-tag IDs and all reactive inputs are retained in the query key
• verify the shared annotation-count invalidation prefix
• cover empty-selection and explicit disabled states
• verify SDK execution forwards the request, cancellation signal, and throwOnError

Stack

• Base: LIG-10240 Render grouped sample-tag class distributions #1697 (LIG-10240 grouped distribution integration)
• This PR: LIG-10251
• Follow-up: LIG-10250 covers grouped BarChart options

This coverage is separated to keep each review below the requested 150-line threshold.

Testing instructions

cd lightly_studio_view
make static-checks
npm run test:unit -- --run \
  src/lib/hooks/useImageAnnotationCountsBySampleTags/useImageAnnotationCountsBySampleTags.test.ts

Expected: 5 tests pass.

Validation

• make static-checks: passed
• 5 focused unit tests: passed

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kondrat-lig-10251-coverage-grouped-sample-tag-query-hook

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