Fixed GT main-hand + TiC off-hand combination dropping items twice

[tier940]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a duplication bug occurring when combining GregTech and Tinkers' Construct tools across hands. By adjusting how the mod interacts with vanilla harvest checks and refining the off-hand preference logic, the system now correctly delegates block breaking and item dropping to the game's native handlers, ensuring that items are only dropped once per block break.

Highlights

• Bug Fix: Resolved an issue where using a GregTech main-hand tool with a Tinkers' Construct off-hand tool caused blocks to drop items twice.
• Logic Refactoring: Updated the cross-hand mining logic to rely on vanilla harvest handling, ensuring consistent behavior and preventing duplicate drop events.
• Code Cleanup: Improved documentation and simplified mixin logic for better maintainability and clarity regarding off-hand tool interaction.

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[gemini-code-assist]

Code Review

このプルリクエストは、GregTech (GT) のメインハンドと Tinkers' Construct (TiC) のオフハンドを併用した際にアイテムが二重にドロップする問題を修正します。主な変更として、DualToolHandler での手動ドロップ処理を廃止してバニラの収穫ロジックに統合し、ツール優先度の判定ロジックを MixinDualToolHarvestUtils へ整理しています。レビューの結果、MixinForgeHooks でのメソッド指定の曖昧さと NPE のリスク、ハンドスワップ発生時のツール耐久値減少の不備、およびツールが必須でないブロックに対するスワップ最適化の余地について改善が求められています。