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.

[changeset-bot]

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Latest commit: 086f291

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commit: 43b9e0a

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 93 lines in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (e9e663f) to head (43b9e0a).
Report is 76 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.00%	53 Missing ⚠️
...ges/mermaid/src/diagrams/class/classRenderer-v2.ts	0.00%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6242      +/-   ##
==========================================
- Coverage     4.47%   4.47%   -0.01%     
==========================================
  Files          385     384       -1     
  Lines        54180   54221      +41     
  Branches       598     623      +25     
==========================================
  Hits          2425    2425              
- Misses       51755   51796      +41     

Flag	Coverage Δ
unit	4.47% <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	0.00% <0.00%> (ø)
packages/mermaid/src/diagrams/pie/pieRenderer.ts	0.00% <0.00%> (ø)

... and 9 files with indirect coverage changes