chore: add test for number with underscore parsing

[matthew-dean]

Rebased version of #4374 by @Krinkle. Resolves conflicts with current master.

The original PR targeted the old test file locations (packages/test-data/css/_main/variables.css and packages/test-data/less/_main/variables.less), which were reorganized in #4378. This rebased version applies the same test additions to the new locations (packages/test-data/tests-unit/variables/).

Original PR: #4374

Credit: @Krinkle

Summary by CodeRabbit

• Style
  • Added new icon styling configurations including support for large icon variants and dynamic icon type-based styling in test data.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 28cc1344-3b41-4d4b-a823-525adca1241b

📥 Commits

Reviewing files that changed from the base of the PR and between 774f188 and b328e05.

📒 Files selected for processing (2)

• packages/test-data/tests-unit/variables/variables.css
• packages/test-data/tests-unit/variables/variables.less

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📝 Walkthrough

Walkthrough

Two test data files receive additive styling rules for a new icon type. A CSS class and its Less variable counterpart are introduced to define styling for a "5_large" icon variant, with no modifications to existing rules.

Changes

Cohort / File(s)	Summary
Icon Styling Rules packages/test-data/tests-unit/variables/variables.css, packages/test-data/tests-unit/variables/variables.less	Adds new .icon-5_large CSS class and corresponding Less variable definition with background-image references to /img/icon/5_large.svg. Both additions follow existing styling patterns with no modifications to existing rules.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit hops with glee so bright,
New icons added, oh what delight!
Five-size-large now has its place,
With CSS and Less to embrace! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title mentions 'number with underscore parsing' but the changes actually add CSS/Less test rules for a 5_large icon variant, not number parsing tests.	Update the title to accurately reflect the actual changes, such as 'chore: add test for icon-5_large styling' or similar, matching the actual CSS/Less additions.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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