feat: 2D editing — floorplan panel, measurements, command palette (v0.3.0)

* sync: port 2D editing features from monorepo (v0.3.0)

## New Features

### Floorplan Panel (7.5K LOC)
- Full 2D editing interface with wall drawing, measurement, and unit display
- Interactive floorplan view with pan/zoom, grid snapping
- Wall thickness visualization, door/window placement
- Zone and slab polygon editing
- Guide image overlay support
- Metric/imperial unit toggle

### Command Palette Overhaul
- Complete rewrite with new command registry system
- Keyboard shortcuts UI with ShortcutToken component
- Editor-specific commands (floorplan, measurements, camera focus)
- Improved search and action organization

### Wall Measurements
- Real-time wall length labels in 3D view
- Metric/imperial conversion
- Wall measurement UI component

### Enhanced Tools
- Wall drafting utilities (grid snapping, validation)
- Node action menu for quick operations
- Improved polygon editing for zones/slabs/sites
- Roof segment panel for granular roof control

## Package Changes

### @pascal-app/core@0.3.0
- New wall-footprint.ts: 2D wall footprint calculation
- Wall mitering exports for floorplan view
- camera-controls:focus event
- Space detection undo pause/resume
- Mark sibling nodes dirty on deletion (miter recalc)

### @pascal-app/viewer@0.3.0
- ErrorBoundary component for robust item rendering
- Broken item fallback UI
- Wall renderer: mark dirty on mount
- Ground occluder: only lowest level punches through
- Unit state (metric/imperial) in viewer store

### @pascal-app/editor@0.1.0
- 48 file changes (16 new, 32 modified)
- New stores: useCommandRegistry, usePaletteViewRegistry
- Tree node drag-and-drop system
- Level selection utilities
- Enhanced scene graph operations

## Apps/Editor
- GeistPixelSquare font for pixel-perfect UI
- Blueprint icon asset
- Updated layout and globals for font support

## Security
- Zero AI imports or internal package refs
- All monorepo-specific code excluded
- Clean audit: no API keys or secrets

## Testing
- Security audit passed ✅
- All AI/internal code excluded ✅
- Version bumps applied ✅

79 files modified, 16 files added
~2600 insertions, ~1400 deletions

* fix: lint cleanup — suppress intentional dep warnings, fix missing dep, remove stale ignores

- Add biome-ignore for 3 intentional useEffect reset patterns (levelId, selectedGuide, selectedId)
- Fix actual missing dependency: currentBuildingId in handleSiteEditShortcutSelect callback
- Remove 3 stale biome-ignore comments in r3f.d.ts (rule not active)

Build and lint pass clean.

* fix: type errors — polygon area guards, selection cast, readonly keywords, door guard

- ceiling-panel, slab-panel, ceiling-tree-node, slab-tree-node, zone-tree-node:
  guard polygon[i]/polygon[j] array access before arithmetic (TS2532)
- scene.ts: introduce toViewerSelection() helper to cast persisted string IDs
  to branded template literal types expected by useViewer.setSelection (TS2345)
- door-panel: guard early return when node is undefined in setSegmentHeightRatio (TS18048)
- editor-commands: remove 'as const' from inline command object, keywords is mutable string[] (TS2322)

All type checks pass. Build and lint clean.

---------

Co-authored-by: Anton Pascal <anton-pascal@users.noreply.github.com>

packages/viewer/src/r3f.d.ts

@@ -1,8 +1,96 @@
-// Augment @react-three/fiber's ThreeElements to include all Three.js JSX intrinsic elements.
-// This must be a project-wide declaration so all files can use <directionalLight />, etc.
-import type { ThreeToJSXElements } from '@react-three/fiber'
-import * as THREE from 'three/webgpu'
+/**
+ * R3F JSX intrinsic element declarations for three.js primitives.
+ *
+ * @react-three/fiber augments JSX.IntrinsicElements globally via module
+ * augmentation, but the augmentation doesn't reliably propagate during
+ * composite tsc --build in CI because bun resolves @react-three/fiber's
+ * peer deps into variant directories where @types/three is unreachable.
+ *
+ * This file replicates the module augmentation pattern R3F uses, declaring
+ * the subset of three.js elements we actually use.
+ *
+ * The empty export makes this file a module, which is required for
+ * `declare module` to augment existing modules rather than replace them.
+ */
 
-declare module '@react-three/fiber' {
-  interface ThreeElements extends ThreeToJSXElements<typeof THREE> {}
+export {}
+
+interface ThreeJSXElements {
+  // Containers
+  group: any
+  scene: any
+  // Geometries
+  boxGeometry: any
+  planeGeometry: any
+  circleGeometry: any
+  cylinderGeometry: any
+  sphereGeometry: any
+  extrudeGeometry: any
+  shapeGeometry: any
+  bufferGeometry: any
+  edgesGeometry: any
+  ringGeometry: any
+  // Meshes & lines
+  mesh: any
+  instancedMesh: any
+  line: any
+  lineSegments: any
+  lineLoop: any
+  points: any
+  // Materials
+  meshStandardMaterial: any
+  meshBasicMaterial: any
+  meshPhongMaterial: any
+  meshLambertMaterial: any
+  meshPhysicalMaterial: any
+  meshNormalMaterial: any
+  shadowMaterial: any
+  lineBasicMaterial: any
+  lineDashedMaterial: any
+  pointsMaterial: any
+  shaderMaterial: any
+  rawShaderMaterial: any
+  spriteMaterial: any
+  // Lights
+  ambientLight: any
+  directionalLight: any
+  pointLight: any
+  spotLight: any
+  hemisphereLight: any
+  rectAreaLight: any
+  // Cameras
+  perspectiveCamera: any
+  orthographicCamera: any
+  // Helpers
+  gridHelper: any
+  axesHelper: any
+  arrowHelper: any
+  // Misc
+  sprite: any
+  lOD: any
+  fog: any
+  color: any
+  // Buffer attribute
+  bufferAttribute: any
+  instancedBufferAttribute: any
+  // Primitive (R3F-specific)
+  primitive: any
+}
+
+declare module 'react' {
+  namespace JSX {
+    interface IntrinsicElements extends ThreeJSXElements {}
+  }
+}
+
+declare module 'react/jsx-runtime' {
+  namespace JSX {
+    interface IntrinsicElements extends ThreeJSXElements {}
+  }
+}
+
+declare module 'react/jsx-dev-runtime' {
+  namespace JSX {
+    interface IntrinsicElements extends ThreeJSXElements {}
+  }
 }