feat: IFC → Pascal converter (package + app)

Brings the IFC-to-Pascal converter into the monorepo as a pure-logic
package plus a Next.js app, replacing the standalone repo that consumed
published @pascal-app/* packages (and drifted from their schemas).

packages/ifc-converter — pure conversion. Parses IFC via web-ifc and
maps elements onto @pascal-app/core node schemas (workspace-linked, so
no more version drift). Builds doors/windows, walls, slabs, columns,
roofs, stairs, sites/buildings/levels. Validates each node via the real
Zod schemas at build time (tryParse) and strips undefined metadata.

apps/ifc-converter — the UI: drop zone, example picker, element search,
JSON download, and a 3D preview rendered through the real
@pascal-app/viewer (registry bootstrap + read-only scene) with a custom
toolbar (camera/level/wall/grid/theme), level selector with
camera-focus, auto-fit, and selection bridged to an inspector.

Conversion specifics worth noting:
- Door/window vertical centering (height/2; windows + sill).
- Nearest-wall hosting fallback for files lacking IFCRELFILLSELEMENT,
  preferring walls long enough to contain the opening and clamping the
  along-wall position so cutouts can't overflow and break wall CSG.
- Plain IFCWALL (Brep/mapped geometry) falls back to default
  height/thickness instead of collapsing to zero-height slivers.
- Columns convert as plain structural shafts (no decorative
  base/capital) sized from the IFC profile.
- Beams + items are skipped for now (no Pascal beam type; items need a
  catalog asset) — counted in the conversion summary.

Large example IFCs are fetched from a public bucket at runtime; the four
small ones are committed. web-ifc.wasm is copied into public/ on
install/dev/build. README flags early-alpha + invites contributions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/ifc-converter/next.config.ts

@@ -0,0 +1,33 @@
+import type { NextConfig } from 'next'
+
+const nextConfig: NextConfig = {
+  logging: {
+    browserToTerminal: true,
+  },
+  transpilePackages: [
+    'three',
+    '@pascal-app/core',
+    '@pascal-app/ifc-converter',
+    '@pascal-app/nodes',
+    '@pascal-app/viewer',
+  ],
+  turbopack: {
+    resolveAlias: {
+      react: './node_modules/react',
+      three: './node_modules/three',
+      '@react-three/fiber': './node_modules/@react-three/fiber',
+      '@react-three/drei': './node_modules/@react-three/drei',
+    },
+  },
+  // web-ifc ships a WASM module. Serving it from the same origin as the
+  // app keeps `WebAssembly.instantiateStreaming` happy with strict CSP /
+  // module-MIME-type checks. The standalone repo copied the file into
+  // public/; we do the same on first dev/build via a postinstall step
+  // (see scripts/copy-web-ifc-wasm.mjs).
+  webpack: (config) => {
+    config.experiments = { ...config.experiments, asyncWebAssembly: true }
+    return config
+  },
+}
+
+export default nextConfig