v0.61.0

Two features. Free rotation: the rotate button opens a menu (90 right, 90 left, 180, and Free rotate) like the flip button; in Free rotate mode the selection's corner handles turn the layer to any angle, real corners become round grips, and the 90/180 steps still apply in one tap. Image trace, smoother edges: traced contours are interpolated into swung curves instead of the raw pixel staircase so they plot cleanly, with real corners kept crisp and a 'Smooth curves' toggle (on by default); tracing also runs at higher resolution now, which helps most when you crop to a small part of a photo.