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Implement Excel-style row and column highlighting when clicking TableView cells #7

@yhy949

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@yhy949

Currently, JavaFX's TableView only highlights the clicked cell itself. I'd like to achieve Excel-like intersection highlighting:

When clicking a cell, automatically highlight its ‌entire row‌ and ‌column‌
Highlight colors should differ from default selection (e.g. light blue for row, light yellow for column)
Support dynamic toggling

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