Fix Timeline LongText wrap issue

[nour0205]

📑 Summary

This PR fixes the issue where long text in Timeline diagrams overflows outside the color block instead of wrapping properly. The solution ensures text automatically wraps and stays inside the designated block.

Resolves #6182

📏 Design Decisions

• Implemented automatic text wrapping inside Timeline diagram blocks.
• Used CSS/SVG text-wrapping to prevent text overflow.
• Maintained compatibility with existing Timeline diagrams

📋 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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Latest commit: 892a482

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commit: 892a482

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 32 lines in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (e9e663f) to head (892a482).
Report is 76 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/timeline/svgDraw.js	0.00%	32 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6258      +/-   ##
==========================================
- Coverage     4.47%   4.47%   -0.01%     
==========================================
  Files          385     384       -1     
  Lines        54180   54192      +12     
  Branches       598     623      +25     
==========================================
  Hits          2425    2425              
- Misses       51755   51767      +12     

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
packages/mermaid/src/diagrams/timeline/svgDraw.js	0.00% <0.00%> (ø)

... and 9 files with indirect coverage changes

[sidharthv96]

Hard-coding these values could cause issues if font size is different.