scott 21c842acdc Add animated package along trajectory with Kepler propagation
- Trajectory sampling: propagate Lambert transfer orbits using universal
  variable Kepler propagation, sample 60 points per leg
- Smooth curved trajectory lines on 2D canvas (real orbital arcs, not
  straight lines)
- Animated green package dot with radial glow traveling along trajectory
- Route progress slider (0-100%) with play/pause animation toggle
- Auto-animating ~20-second cycle through the full route
- WASM API: sample_route_trajectory() with per-leg NaN separators

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-08 12:21:58 -07:00
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