7000: Fix mindmap rendering issue when Level 2 nodes exceed 11

[darshanr0107]

📑 Summary

This PR fixes an issue where mindmap Level 2 nodes beyond the 11th rendered incorrectly.
Affected nodes appeared in black and were disconnected from the graph
Resolves #7000

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Latest commit: 03e8589

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commit: 03e8589

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.55%. Comparing base (fed8a52) to head (03e8589).
⚠️ Report is 97 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/mindmap/mindmapDb.ts	0.00%	2 Missing ⚠️
packages/mermaid/src/diagrams/mindmap/svgDraw.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7099      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          473     473              
  Lines        47480   47497      +17     
  Branches       730     731       +1     
==========================================
  Hits          1687    1687              
- Misses       45793   45810      +17     

Flag	Coverage Δ
unit	3.55% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/mindmap/svgDraw.ts	0.00% <0.00%> (ø)
packages/mermaid/src/diagrams/mindmap/mindmapDb.ts	0.00% <0.00%> (ø)

... and 6 files with indirect coverage changes

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	1 added	Nov 14, 2025, 5:56 AM