fix: framerate-independent global scale speed

[manaporkun]

From #26 (P2). ScaleGlobal.Interact multiplied the per-frame mouse pixel delta by Time.deltaTime, so uniform-scale speed depended on the frame rate (higher fps → smaller dt → slower scaling for the same drag).

Fix: drop Time.deltaTime so the scale delta depends only on drag distance. MouseSensitivity retuned 2f → 0.0333f to preserve the previous feel at 60 fps (old effective rate was 2 * (1/60) ≈ 0.0333 per pixel).

⚠️ Constant is feel-matched to 60 fps but not play-tested here — quick manual check of the global (center cube) scale drag recommended; the behavior is now correct (framerate-independent) regardless of the exact constant.

fix: → patches to 3.0.3 on merge.

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Note

Low Risk
Small interaction tweak in one scale handle; feel is constant-matched to 60 fps but worth a quick manual drag check.

Overview
Fixes framerate-dependent uniform scaling on the global (center cube) scale handle in ScaleGlobal.Interact.

The drag delta was incorrectly multiplied by Time.deltaTime on top of per-frame mouse pixel movement, so higher FPS made scaling slower for the same drag. Time.deltaTime is removed so scale change tracks drag distance only. MouseSensitivity is retuned from 2f to 0.0333f to approximate the old feel at 60 fps (2 * deltaTime per pixel).

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