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/lib/test-files.ts

@@ -0,0 +1,114 @@
+export interface TestFile {
+  name: string
+  label: string
+  detail: string
+  description: string
+  /**
+   * Served from `examplesBaseUrl` instead of the repo's `public/` folder.
+   * The large IFC samples (tens of MB each) aren't committed to keep the
+   * open-source repo lean; they're hosted externally and fetched at
+   * runtime. Marked entries only appear once a base URL is configured.
+   */
+  remote?: boolean
+  /** Shown as a caution on the example card (e.g. heavy models that can
+   * tax the browser when rendered). */
+  warning?: string
+}
+
+// Host serving the large (remote) example IFCs by filename. The big
+// samples (tens of MB) aren't committed to keep the repo lean — they
+// live in a public, read-only Supabase Storage bucket. Overridable via
+// env (NEXT_PUBLIC_ is inlined at build time by Next.js); set it to ''
+// to hide the remote examples entirely.
+const DEFAULT_EXAMPLES_BASE_URL =
+  'https://byrpxoiotywskoojsrzd.supabase.co/storage/v1/object/public/ifc_examples'
+
+export const examplesBaseUrl = (
+  process.env.NEXT_PUBLIC_IFC_EXAMPLES_BASE_URL ?? DEFAULT_EXAMPLES_BASE_URL
+).replace(/\/$/, '')
+
+export const testFiles: TestFile[] = [
+  {
+    name: '01-duplex.ifc',
+    label: 'Duplex Apartment',
+    detail: '1.2 MB',
+    description: 'Multi-level apartment from IFC Tools Project',
+  },
+  {
+    name: '02-schependomlaan.ifc',
+    label: 'Schependomlaan',
+    detail: '47 MB',
+    description: 'Dutch apartment complex (buildingSMART)',
+    remote: true,
+    warning: 'Very large — may slow down or crash the browser when rendered.',
+  },
+  {
+    name: '03-rac-sample-project.ifc',
+    label: 'RAC Sample Project',
+    detail: '43 MB',
+    description: 'Revit commercial office building',
+    remote: true,
+  },
+  {
+    name: '04-ifc-open-house.ifc',
+    label: 'IFC Open House',
+    detail: '111 KB',
+    description: 'Small residential house (IFC4)',
+  },
+  {
+    name: '05-paris-ground-floor.ifc',
+    label: 'Paris Building',
+    detail: '3.9 MB',
+    description: '19 rue Marc Antoine Petit, Paris',
+  },
+  {
+    name: '06-sample-castle.ifc',
+    label: 'Sample Castle',
+    detail: '47 MB',
+    description: 'Historic architecture demo model',
+    remote: true,
+    warning: 'Very large — may slow down or crash the browser when rendered.',
+  },
+  {
+    name: '07-revit-architectural.ifc',
+    label: 'Revit Architectural',
+    detail: '13 MB',
+    description: 'Autodesk Revit Architecture model',
+    remote: true,
+  },
+  {
+    name: '08-revit-mep.ifc',
+    label: 'Revit MEP',
+    detail: '28 MB',
+    description: 'Building systems from Revit MEP',
+    remote: true,
+  },
+  {
+    name: '09-revit-structural.ifc',
+    label: 'Revit Structural',
+    detail: '11 MB',
+    description: 'Structural engineering from Revit',
+    remote: true,
+  },
+  {
+    name: '10-sample-house.ifc',
+    label: 'Sample House',
+    detail: '2.2 MB',
+    description: 'Complete residential house model',
+  },
+]
+
+/** Resolve where to fetch a given example from. */
+export function exampleFileUrl(file: TestFile): string {
+  return file.remote ? `${examplesBaseUrl}/${file.name}` : `/test-ifc-files/${file.name}`
+}
+
+/**
+ * Examples to show in the picker: the committed local ones always, plus
+ * the remote ones once a base URL is configured (so a fresh clone with
+ * no env doesn't surface examples that would 404).
+ */
+export function availableTestFiles(): TestFile[] {
+  if (examplesBaseUrl) return testFiles
+  return testFiles.filter((f) => !f.remote)
+}