Fix: Adjust pie chart title to prevent cropping and added example for testing

[nourhenta]

Description

Fixes #6232 - Pie Chart Title Gets Cut Off if Too Long

Solution

• Dynamically adjusts the font size of the pie chart title to fit within the chart's width.
• Updated the example.html to showcase the solution with a long title.

Testing

Tested with different title lengths to ensure proper resizing. Attached a screenshot of the result.

Notes

This solution avoids splitting the title into multiple lines and maintains the design aesthetics by scaling the font size.

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commit: c879a9d

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Codecov Report

Attention: Patch coverage is 0% with 51 lines in your changes missing coverage. Please review.

Project coverage is 3.86%. Comparing base (ceb8d4c) to head (264ada6).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.00%	26 Missing ⚠️
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	0.00%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6242      +/-   ##
==========================================
- Coverage     3.86%   3.86%   -0.01%     
==========================================
  Files          411     412       +1     
  Lines        43178   43214      +36     
  Branches       664     664              
==========================================
  Hits          1670    1670              
- Misses       41508   41544      +36     

Flag	Coverage Δ
unit	3.86% <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
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	0.34% <0.00%> (-0.03%)	⬇️
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.67% <0.00%> (-0.04%)	⬇️

... and 1 file with indirect coverage changes

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[sidharthv96]

Hi @nourhenta, thanks for the PR, love the dynamic sizing!
We need to make a few changes for it to be merged.

• Please revert all the prettier related changes, these can be added in a separate PR
• Remove changes from unrelated files like classRenderer

Although not a hard requirement, It would be good to split the title into lines, if it's overflowing, even after the min font size is reached.

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[sidharthv96]

Please add a rendering test that showcases titles with varying lengths.

[sidharthv96]

Was these changes supposed to be part of a different PR?
I'm not sure why we need class Renderer changes in a Pie diagram PR.

[sidharthv96]

Remove this file from the PR?