Pure CSS approach: @property --border-angle + conic-gradient on border-box.
No extra elements, no overflow issues, no JS animation.
Smooth rotation via CSS Houdini custom property animation.
Replace framer-motion gradient interpolation (buggy in TG WebView) with
pure CSS conic-gradient + transform:rotate() keyframe animation.
Transform animations are GPU-accelerated and reliable everywhere.
- Use accent CSS vars for gradient (matches app theme dynamically)
- Increase gradient spot size for visible animation
- Darker inner bg (dark-900) for better contrast
- Increase blur to 3px for glow effect
