Allow a final semicolon in style strings

[mwouts]

Fixes #386

[github-actions]

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Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@fix_386

(this requires nodejs, see more at Developing ITables)

[Copilot]

Pull Request Overview

This PR fixes issue #386 by allowing an optional final semicolon in style strings.

• Adds tests to validate the new behavior of allowing a trailing semicolon.
• Updates the get_expanded_style function to filter out empty style segments.
• Updates the changelog to document the feature change.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/test_javascript.py	Adds tests for get_expanded_style covering the final semicolon.
src/itables/javascript.py	Refines style expansion logic to ignore empty segments from trailing semicolon.
docs/changelog.md	Updates the changelog to mention support for an optional final semicolon.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.05%. Comparing base (6da378b) to head (2d157aa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   88.91%   89.05%   +0.13%     
==========================================
  Files          44       44              
  Lines        1832     1837       +5     
==========================================
+ Hits         1629     1636       +7     
+ Misses        203      201       -2     

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