support non-ascii characters in sankey

[lakca]

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Resolves #6822

📏 Design Decisions

Including all unicode characters except control codes and special codes in sankey diagram grammar.

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commit: 80d6fec

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@@            Coverage Diff            @@
##             develop   #6823   +/-   ##
=========================================
  Coverage           ?   3.71%           
=========================================
  Files              ?     455           
  Lines              ?   44763           
  Branches           ?     708           
=========================================
  Hits               ?    1661           
  Misses             ?   43102           
  Partials           ?       0           

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Aug 5, 2025, 10:48 AM

[lakca]

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