LIG-10250 Test grouped BarChart options

[ikondrat]

Summary

• cover grouped series on a shared class axis
• verify missing tag/class combinations are zero-filled
• cover both vertical and horizontal grouped layouts
• verify scrollable legend configuration
• verify stable, distinct series colours
• cover tag-aware tooltip labels and counts

Stack

• Base: LIG-10251 Test grouped sample-tag counts hook #1699 (LIG-10251 grouped-query hook coverage)
• This PR: LIG-10250
• Follow-up: LIG-10249 covers selector and distribution-panel integration

Testing instructions

cd lightly_studio_view
make static-checks
npm run test:unit -- --run \
  src/lib/components/BarChart/buildEchartsOption.test.ts \
  src/lib/components/BarChart/BarChart.test.ts

Expected: 15 tests pass.

Validation

• make static-checks: passed
• 15 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-10250-coverage-grouped-barchart-options

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