Description

Closes CON-3524.

Fixes fallback theme to work properly.
Add a utility function to turn theme names to kebab case.

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Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

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Tests

core/utils/text.vitest.ts

Summary by cubic

Fixes theme fallback so unsupported themes now use dark-plus, keeping code rendering consistent. Also adds a theme name normalizer for safer lookups. Addresses CON-3524.

• Bug Fixes

  • CodeRenderer now falls back to dark-plus when a theme is missing or unsupported, and always initializes the highlighter after choosing the theme.
  • Normalizes theme names with kebabOfThemeStr and maps “Default Dark Modern” to dark-plus.

• New Features

  • Added kebabOfThemeStr to normalize theme names (spaces/underscores to hyphens, remove parentheses).
  • Added unit tests for kebabOfThemeStr (core/util/text.vitest.ts).