fix: pie: Don't sort, keep order. Keep color order constant.

[daym]

📑 Summary

This keeps the order of the pie slices in the order their values were ordered in the input. Since we still filter out small slices, make sure this doesn't shift colors either.

Resolves #5899

📏 Design Decisions

• Keep order of the pie slices in the order their values were ordered in the input.
• Keep using up colors even if the slice is filtered out as < 1%. That way all following colors dont shift just because something dropped below 1%

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commit: d31993f

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Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.57%. Comparing base (d5bc07d) to head (d31993f).
⚠️ Report is 263 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7295      +/-   ##
==========================================
- Coverage     3.57%   3.57%   -0.01%     
==========================================
  Files          473     474       +1     
  Lines        47475   47489      +14     
  Branches       734     734              
==========================================
  Hits          1696    1696              
- Misses       45779   45793      +14     

Flag	Coverage Δ
unit	3.57% <0.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.70% <0.00%> (-0.02%)	⬇️

... and 1 file with indirect coverage changes

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	8 changed	Jan 6, 2026, 2:31 PM

[sidharthv96]

This PR updates the rendering to match our documentation, which is great.

It would be good to have a follow-up PR to add a config to set sorting order, so people who need different ordering can enable it via frontmatter.

---
config:
  pie:
    sortBy: 'value' | undefined
---
...

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