Initial project setup: Rust/WASM solar system simulator with SvelteKit frontend

- Rust workspace with 4 crates: orbital-mechanics, mass-driver-core, mass-driver-wasm, mass-driver-backend
- Keplerian orbital mechanics engine with JPL elements for 14 bodies (Sun, 8 planets, Pluto, Ceres, Europa, Titan, Ganymede)
- Kepler equation solver and orbital position computation compiled to WASM
- SvelteKit frontend with Tailwind CSS, Canvas2D renderer showing animated solar system
- Orbit ellipses, planet dots with labels, Sun glow, grid, scale bar, pan/zoom controls
- Time controls (play/pause, 5 speed levels, date picker) driving live simulation
- 2D/3D view toggle (3D placeholder for Threlte integration)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/app.css

@@ -0,0 +1,22 @@
+@import 'tailwindcss';
+
+:root {
+	--bg-primary: #0a0a0f;
+	--bg-secondary: #12121a;
+	--bg-panel: #1a1a2e;
+	--text-primary: #e0e0e8;
+	--text-secondary: #8888a0;
+	--accent-blue: #4a9eff;
+	--accent-orange: #ff6a33;
+	--accent-green: #33ff88;
+}
+
+html, body {
+	margin: 0;
+	padding: 0;
+	height: 100%;
+	overflow: hidden;
+	background-color: var(--bg-primary);
+	color: var(--text-primary);
+	font-family: 'Inter', system-ui, -apple-system, sans-serif;
+}