[ENH]: fix adorn functions to preserve numeric values in first column (#1676)

[SumanGouda]

[ENH]: fix adorn functions to preserve numeric values in first column

PR Description

Please describe the changes proposed in the pull request:

• Updated adorn_pct_formatting, adorn_ns, and adorn_rounding to exclude the first column (index 0) from numeric column processing so non-category identifiers (e.g., cyl) remain untouched.
• Ensured string assignment in adorn_ns safely handles data column types by casting targeted columns to object.
• Added unit test test_adorn_functions_preserve_numeric_first_column in tests/functions/test_tabyl.py to verify behavior with numeric first columns.

This PR resolves #1676.

PR Checklist

Please ensure that you have done the following:

1. PR in from a fork off your branch. Do not PR from sumangouda:dev, but rather from sumangouda:fix/adorn-numeric-first-column.
2. Add a line to CHANGELOG.md under the latest version header (i.e. the one that is "on deck") describing the contribution.

Automatic checks

There will be automatic checks run on the PR. These include:

• Building a preview of the docs on Netlify
• Automatically linting the code
• Making sure the code is documented
• Making sure that all tests are passed
• Making sure that code coverage doesn't go down.

Relevant Reviewers

Please tag maintainers to review.

• @ericmjl

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.98%. Comparing base (901f4b3) to head (c00cf7a).
⚠️ Report is 218 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1696      +/-   ##
==========================================
- Coverage   87.56%   85.98%   -1.58%     
==========================================
  Files          95      125      +30     
  Lines        6819     9962    +3143     
==========================================
+ Hits         5971     8566    +2595     
- Misses        848     1396     +548     

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[SumanGouda]

The doc build failed with a 403 permission error on github-actions[bot] deploying to gh-pages (PR preview deployment from fork).

[samukweku]

@ericmjl may i get your review on this