fix: xychart to support accented chars (7157)

[estulpz202]

📑 Summary

Allow xychart to parse accented Latin characters in axis labels and titles.

Previously, the lexer only treated ASCII letters (A–Z, a–z) as valid ALPHA tokens. As a result, common accented characters like é or è caused “Unrecognized text” errors in x-axis categories and y-axis titles.

This PR expands the ALPHA token to include accented Latin characters and adds a parser spec to ensure xychart accepts them correctly.

Resolves #7157

📏 Design Decisions

• Updated the ALPHA rule in xychart.jison from:
  • [A-Za-z]+
    to:
  • [A-Za-zÀ-ÖØ-öø-ÿ]+
    so that common accented Latin characters are recognized as part of words, while preserving existing behavior for ASCII labels.
• Kept the change narrowly scoped to the lexer token definition and its tests to minimize the risk of regressions in other xychart parsing behavior.

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  • @relturu submitted documentation pr [docs] Documentation addition for fix to gitGraph failings on rotateCommitLabel, showBranches, and parallelCommits (Issue #7126, PR #7223) #7226
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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.56%. Comparing base (a3a5040) to head (2c70098).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #7224   +/-   ##
=======================================
  Coverage     3.56%   3.56%           
=======================================
  Files          474     474           
  Lines        47577   47577           
  Branches       734     734           
=======================================
  Hits          1696    1696           
  Misses       45881   45881           

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Dec 7, 2025, 1:59 AM