Initial commit: Arcanum TD — medieval fantasy tower defense

Vite + React + PixiJS + TypeScript. Features:
- 4-level campaign (King's Road → Obsidian Keep)
- Isometric 2.5D grid with ley-line mechanics
- ECS architecture (entities, components, systems)
- 4 tower types, hero spellcaster, 10+ enemy types
- Lich King boss with 3-phase AI
- Meta-progression: essence, rune unlocks
- Full UI redesign with fantasy design system

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main.tsx

@@ -0,0 +1,15 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import '@/styles/globals.css'
+import { App } from '@/App'
+import { useMetaStore } from '@/state/metaStore'
+import { useSettingsStore } from '@/state/settingsStore'
+
+useMetaStore.getState().load()
+useSettingsStore.getState().load()
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)