fix: ThemedTable2 header overflow detection by including the sort icon width in the available text width, ensuring tooltips appear correctly

[ManuelRomeroA]

This pull request addresses an issue with header overflow detection in the ThemedTable2 widget. The main improvement ensures that tooltips appear correctly by accounting for the width of the sort icon when calculating the available text width in table headers.

Table Header Overflow Fixes

• Updated the calculation of available text width in ThemedTable2 headers to subtract the sort icon width when present, ensuring accurate overflow detection and proper tooltip display.

Documentation and Versioning

• Updated the CHANGELOG.md to document the header overflow fix in version 7.5.20.
• Bumped the package version to 7.5.20 in pubspec.yaml.

[github-actions]

📋 Changelog Summary

This PR includes the following changes:

🐛 Bug Fixes

• ThemedTable2 header overflow detection by including the sort icon width in the available text width, ensuring tooltips appear correctly f (09d789e by Manuel romero)

📊 Diff Stats

Metric	Count
📄 Files changed	3
🟢 Insertions	$\color{green}\textsf{+8}$
🔴 Deletions	$\color{red}\textsf{-2}$

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[github-actions]

📊 Test Coverage Report

🎯 Dart/Flutter

Metric	Value
Coverage	11.1%
Lines covered	10811 / 127
Lines missing	-10684

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