Disable imageSmoothingEnabled for SpritePhysicsEditor

[nighca]

Related: #2214, #2255.

[qiniu-prow]

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[Copilot]

Pull Request Overview

This PR disables image smoothing for the SpritePhysicsEditor component to ensure pixel-perfect rendering of sprite images without anti-aliasing effects.

• Adds imageSmoothingEnabled: false to the layer configuration object

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[niupilot]

Code Review Summary

This is a clean, targeted optimization that improves visual quality for sprite physics editing. The change disables image smoothing to maintain crisp pixel art rendering, which is essential for accurate collision shape visualization.

Key findings:

• ✅ Performance positive - eliminates unnecessary GPU interpolation
• ✅ Consistent with codebase patterns - same approach used in MapViewer and StageViewer
• ✅ No security concerns - purely a visual rendering optimization
• 📝 Minor documentation gap - addressed with inline comment suggestion

The implementation follows Vue.js best practices and enhances user experience without introducing any technical debt.

[qiniu-ci]

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