fix(common): support multiple CSS classes in cell style updates

[ghiscoding]

replicate SlickGrid PR 1298

Summary

• Split space-separated CSS class names before applying them to rendered cells.
• Prevent InvalidCharacterError from classList.add() and classList.remove().
• Added regression coverage for adding and removing multiple classes.

Testing

• Focused SlickGrid unit tests: 458 passed
• Prettier check passed
• git diff --check passed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (277fa5c) to head (488eaab).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2794   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         199      199           
  Lines       25867    25867           
  Branches     9176     9176           
=======================================
  Hits        25867    25867           

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: 488eaab