Some patches from poi

[antony-liu]

Main changes:
61060 - teach DataFormatter about conditional formatting rules with number formats
Add table style test cases
github-52: add ExcelToHtmlConverter method that works on InputStreams.
github-32: speed up Irr() Excel formula computation by replacing Math.pow() with multiplication.

[Copilot]

Copilot reviewed 29 out of 29 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

main/SS/Util/CellReference.cs:640

• The exception message incorrectly refers to 'Person' instead of the expected 'CellReference'. Please update the message to accurately reflect the object type.

else throw new ArgumentException("Object is not a Person");

main/SS/Formula/Functions/Match.cs:175

• [nitpick] The updated error message now concatenates the eval object's string representation instead of its type name, which might reduce clarity during debugging. Consider including type information.

throw new Exception("Unexpected eval type (" + eval + ")");

[tonyqus]

Can you help solve the conflict?

[antony-liu]

The conflict resolved.