Fix dataset undefined values and selection hover bug#456

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Irozuku wants to merge 3 commits intodevelopfrom

fix/undefined-rows-columns

Commits on Feb 25, 2026

fix: ensure total_rows and total_columns are defined before enriching datasets
Irozuku
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style: update hover background color logic in ItemBox component
Irozuku
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style: format hover background color logic in ItemBox component
Irozuku
committed