fix: delete reverse-selected rows correctly

[biubiukam]

🤔 This is a ...

• New feature
• Bug fix
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Refactoring
• Update dependency
• Code style optimization
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• Site / documentation update
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🔗 Related issue link

Fixes #5214

💡 Background and solution

VTable Sheet keeps the original drag direction in row selection ranges. When rows are selected from bottom to top, the range has a larger start row than end row.

The context-menu flow previously assumed ascending row ranges in two places:

• Right-clicking inside a reverse-dragged selection was treated as clicking outside it, so the selection could collapse to one row.
• The delete handler iterated directly from the start row to the end row, so a reverse range was not fully deleted.

This change normalizes the row boundaries before checking whether the right-clicked row belongs to the selection and before collecting rows to delete. A regression test covers reverse row selection, right-click preservation, and batch deletion with VTable Sheet's record synchronization mode.

Validation:

• @visactor/vtable-plugins TypeScript compilation
• @visactor/vtable-plugins: 8 suites, 58 tests
• Pre-push package suite:
  • @visactor/vtable-sheet: 76 suites, 442 tests
  • @visactor/vtable: 52 suites, 223 tests
  • Related Gantt and Vue package tests

📝 Changelog

Language	Changelog
🇺🇸 English	Fix deleting rows selected by dragging upward in VTable Sheet.
🇨🇳 Chinese	修复 VTable Sheet 从下向上拖选多行后右键删除不正确的问题。

☑️ Self-Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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🚀 Summary

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🔍 Walkthrough

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