LIG-10249 Test sample-tag distribution integration

[ikondrat]

Summary

• test controlled sample-tag selection and deselection
• verify grouped tag series remain independent while class ranking uses aggregate counts
• verify the grouped chart replaces the misleading combined total with a sample-tag summary
• cover the expanded-dialog comparison summary
• verify comparison data follows the selected annotation-type group

Stack

• Base: LIG-10252 Show groups for a single distribution source #1701 (LIG-10252 single-source group selector fix)
• This PR: LIG-10249
• Follow-up: LIG-10241 adds the focused Playwright flow

Testing instructions

cd lightly_studio_view
make static-checks
npm run test:unit -- --run \
  src/lib/components/DatasetDistributionPanel/TagComparisonSelect.test.ts \
  src/lib/components/DatasetDistributionPanel/DatasetDistributionPanel.test.ts \
  src/lib/components/DatasetDistributionPanel/ExpandDialog/ExpandDialog.test.ts

Expected: 36 tests pass.

Validation

• make static-checks: passed
• 36 focused component tests: passed

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch kondrat-lig-10249-coverage-sample-tag-selector-and-distribution-integration

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