Fixed journey diagram box resizing issue

[nour0205]

📑 Summary

This PR fixes the box resizing issue in Journey Diagrams where text overflow was causing the boxes to be cropped instead of expanding properly.

Resolves #6243

📏 Design Decisions

Updated the width calculations to ensure that boxes automatically adjust their size based on the text length.

Modified SVG rendering logic to respect useMaxWidth and dynamically scale elements while maintaining readability.

Updated snapshot tests to align with the expected new behavior of auto-resizing boxes

📋 Tasks

Make sure you

• [x ] 📖 have read the contribution guidelines
• [x ] 💻 have added necessary unit/e2e tests.
• [ x] 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [x ] 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

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commit: 311e046

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 50 lines in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (e9e663f) to head (311e046).
Report is 76 commits behind head on develop.

Files with missing lines	Patch %	Lines
...kages/mermaid/src/diagrams/user-journey/svgDraw.js	0.00%	35 Missing ⚠️
...rmaid/src/diagrams/user-journey/journeyRenderer.ts	0.00%	15 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6248   +/-   ##
=======================================
  Coverage     4.47%   4.47%           
=======================================
  Files          385     385           
  Lines        54180   54156   -24     
  Branches       598     598           
=======================================
  Hits          2425    2425           
+ Misses       51755   51731   -24     

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
...rmaid/src/diagrams/user-journey/journeyRenderer.ts	0.00% <0.00%> (ø)
...kages/mermaid/src/diagrams/user-journey/svgDraw.js	0.00% <0.00%> (ø)

... and 8 files with indirect coverage changes