fix: resolve HTML entity handling inconsistency across diagram types

[zishan9450]

🐛 Description

Fixes inconsistent HTML entity handling where titles containing # characters were truncated in some diagram types but not others.

Issue: Titles like "Book #2: sous-titre" worked in flowcharts but were truncated to "Book" in journey and sequence diagrams.

🔍 Root Cause

Jison lexer rules in multiple parsers excluded # characters from title parsing patterns using [^#\n;]+, causing text after # to be treated as comments and ignored.

✅ Solution

• Removed # from exclusion patterns in title, acc_title, and acc_descr lexer rules
• Applied fix consistently across all affected diagram parsers
• Added comprehensive test suite to validate the fix and prevent regression

Changed Pattern Examples:

- <acc_title>(?!\n|;|#)*[^\n]*     
+ <acc_title>(?!\n|;)*[^\n]*       

- "title"\s[^#\n;]+                
+ "title"\s[^\n;]+                 

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commit: 91baaa2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.55%. Comparing base (fed8a52) to head (91baaa2).

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7110      +/-   ##
==========================================
- Coverage     3.55%   3.55%   -0.01%     
==========================================
  Files          473     474       +1     
  Lines        47480   47491      +11     
  Branches       730     730              
==========================================
  Hits          1687    1687              
- Misses       45793   45804      +11     

Flag	Coverage Δ
unit	3.55% <ø> (-0.01%)	⬇️

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Oct 27, 2025, 6:10 PM