Add Table row mapping helpers and update test expectations

[satyendhran]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

AI?

• AI was used to generate this PR

AI generated PRs may be accepted, but only if @willmcgugan has responded on an issue or discussion.

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate (see note about typos above).
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Please describe your changes here.

Important: Link to an issue or discussion regarding these changes.

• Added Table.add_row_dict for header-mapped row insertion with auto column creation.
• Added Table.iadd support for single renderables, sequences, and row batches.
• Fixed log output expectations to tolerate line-number and hyperlink variance.
• Guarded markdown and attrs tests with dependency checks to prevent false failures.
• Updated tests to cover the new table additions via existing table test patterns and console capture checks.