fix(pie):longestTextWidth can be -Infinity

[Zane0816]

📑 Summary

fix pie longestTextWidth can be -Infinity

Resolves #

📏 Design Decisions

let it min with 0

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Latest commit: f94d74d

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commit: f94d74d

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.55%. Comparing base (d7eb94d) to head (f94d74d).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7177      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          474     474              
  Lines        47511   47512       +1     
  Branches       731     731              
==========================================
  Hits          1687    1687              
- Misses       45824   45825       +1     

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

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Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.71% <0.00%> (-0.01%)	⬇️

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Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	1 changed	Nov 25, 2025, 7:21 AM