V70 CORNER PINCH ANGLE SLIDER

What changed
- Adds a new Petal-tab slider: Corner pinch angle.
- This tilts the top/bottom end petals toward the side leaf so the corner where they meet is more acute instead of nearly orthogonal.

How to use
- Open Settings -> Petal.
- Keep your existing size sliders as desired.
- Increase Corner pinch angle until the meeting corner becomes narrow enough.
- Press Regenerate secondary now (or G) after adjusting.

Notes
- 0° keeps the old shape.
- Around 15°-35° should noticeably sharpen the corner.
- Higher values create a stronger pinched / acute junction.
