6256 - Allow themeVariables to have additional valid CSS colors

[MikeSQ]

📑 Summary

This is to resolve the recent issue I submitted. Before this PR there are several color options that can't be used without the sanitization stripping them out. After the PR, you should be able to set a themeVariable to:

• var(--some-css-var)
• light-dark(var(--lightColor), var(--darkColor))
• lighten(var(--someColor), 10%)
• oklch(from var(--base-color) calc(1 * 1.15) c h)

For me, this will enable easy theming of the diagrams based on user selection of light mode or dark mode, but in general it should open up a lot of theming possibilities for everybody I think.

This is my first PR on a major project, so apologies if I make any mistakes :)

Resolves #6256

📏 Design Decisions

The only change here was to the regular expression, I tried to do the bare minimum to allow the CSS. Dashes were added which covers most of the features above, I also added the ability to do *, +, /

📋 Tasks

Make sure you

• [✅ ] 📖 have read the contribution guidelines
• [✅ ] 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• 🦋 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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commit: b6c35be

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (8dd0e7a) to head (b6c35be).

Files with missing lines	Patch %	Lines
packages/mermaid/src/utils/sanitizeDirective.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6261   +/-   ##
=======================================
  Coverage     4.47%   4.47%           
=======================================
  Files          385     384    -1     
  Lines        54191   54180   -11     
  Branches       598     623   +25     
=======================================
  Hits          2425    2425           
+ Misses       51766   51755   -11     

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/utils/sanitizeDirective.ts	13.09% <0.00%> (ø)

... and 1 file with indirect coverage changes