Improve trackpad pinch-zoom sensitivity in camera controls

Summary

Trackpad pinch-zoom events are sent as wheel events in browsers, but their deltas are significantly smaller than mouse wheel events. This results in unsatisfying pinch-zoom behavior in camera-controls.mjs.

Required Changes

• Detect input type (mouse wheel vs trackpad pinch) from the wheel event rather than relying on arbitrary delta thresholds
• Apply appropriate sensitivity scaling based on the detected input type
• Test across different platforms, devices, and OS scroll speed settings to ensure consistent behavior

Context

This was identified in #7348. The proposed fix there used a magic number threshold (< 25) and a 10x multiplier, which would be inconsistent across devices and OS scroll speed settings. A proper solution should differentiate input types and handle them accordingly.

References

• Original PR: #7348
• File: scripts/esm/camera-controls.mjs