Cascade 2.1.0

• ~2.8× faster physics (warm-started solver, sorted grid) on a worker thread; all beads drawn in one call
• Realistic shaking: fused gravity/linear sensors, vertical jolts make beads hop, gyroscope twist swirls the pile
• Richer haptics: hit strength levels, thud/click for hard hits, rattle texture while beads tumble
• Stereo, denser glass sounds; Fresnel rims and tilt-following highlights
• New settings: size, gravity, shake, twist, bounciness, friction, quality, volume, haptic strength, trails, refresh rate, keep screen on, FPS, reset; 8 colours; up to 2,000 beads