test(sankey): add tests for special characters in node names

[cyphercodes]

Summary

This PR adds explicit test cases for special characters in Sankey diagram node names to verify and document support for these characters.

Related Issue

Fixes #7528 - Sankey Diagram Parsing Failure: Special Characters in Node Names Trigger "Syntax error in text"

Changes

• Added two new test cases in sankey.spec.ts:
  • 'handles special characters in node names with sankey-beta syntax'
  • 'handles special characters in node names with sankey syntax'

Test Coverage

The tests verify that the following special characters are correctly parsed in node names:

• Single quotes: Agricultural 'waste'
• Ampersands: Lighting & appliances
• Forward slashes: Over generation / exports
• Hyphens: Heating and cooling - homes

Verification

The tests confirm that the parser already correctly handles these characters. The issue reported in #7528 appears to have been resolved in the current version (v11.13.0).

Checklist

• Tests added for new functionality
• All existing tests pass
• Code follows project style guidelines (linting passed)

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commit: ec32396

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.34%. Comparing base (701020c) to head (ec32396).

Files with missing lines	Patch %	Lines
...d/src/rendering-util/rendering-elements/markers.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7545   +/-   ##
=======================================
  Coverage     3.34%   3.34%           
=======================================
  Files          524     524           
  Lines        55309   55309           
  Branches       795     795           
=======================================
  Hits          1850    1850           
  Misses       53459   53459           

Flag	Coverage Δ
unit	3.34% <0.00%> (ø)

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Files with missing lines	Coverage Δ
...d/src/rendering-util/rendering-elements/markers.js	0.00% <0.00%> (ø)

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	2 changed	Apr 1, 2026, 10:11 AM