7007: Fix parsing error for backslashes in math formulas within new flowchart shape syntax

[darshanr0107]

📑 Summary

This PR fixes a parsing issue where math formulas containing backslashes (\) were incorrectly handled in the new flowchart shape syntax. The issue caused Mermaid to throw a lexical or syntax error when formulas like \frac{a}{b} or x \to y were used inside shape definitions.

Resolves #7007

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commit: d277426

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.55%. Comparing base (3d768f3) to head (d277426).
⚠️ Report is 68 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7086      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          473     473              
  Lines        47481   47496      +15     
  Branches       730     730              
==========================================
  Hits          1687    1687              
- Misses       45794   45809      +15     

Flag	Coverage Δ
unit	3.55% <ø> (-0.01%)	⬇️

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Nov 5, 2025, 2:11 PM

[sidharthv96]

I don't see any difference between current version and this PR's version, for the diagram shared in the test.

[darshanr0107]

I don't see any difference between current version and this PR's version, for the diagram shared in the test.

resolved in d277426