🏔️ Snow Slab Avalanche Stability Index, Slope Angle and Runout Lab — 2D Stability and Runout Chart

2D side-view companion of the snow-slab avalanche lab: slope profile with slab and weak layer, stability index against slope angle, critical thickness, Voellmy-Salm block speed and alpha-beta runout from the same physics module as the 3D page.