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>

apps/editor/app/globals.css

@@ -11,6 +11,9 @@
   --font-mono:
     var(--font-geist-mono), ui-monospace, SFMono-Regular, Menlo, Monaco,
     Consolas, monospace;
+  --font-pixel:
+    var(--font-geist-pixel-square), var(--font-geist-mono), ui-monospace,
+    SFMono-Regular, Menlo, Monaco, Consolas, monospace;
   --font-barlow:
     var(--font-barlow), var(--font-geist-sans), ui-sans-serif, system-ui,
     sans-serif;
@@ -21,6 +24,8 @@
   --color-foreground: var(--foreground);
   --font-sans: var(--font-barlow), sans-serif;
   --font-mono: var(--font-geist-mono), monospace;
+  --font-pixel:
+    var(--font-geist-pixel-square), var(--font-geist-mono), monospace;
   --font-barlow: var(--font-barlow), sans-serif;
   --color-sidebar-border: var(--sidebar-border);
   --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);

apps/editor/app/layout.tsx

@@ -1,4 +1,5 @@
-import type { Metadata } from 'next'
+import { Agentation } from 'agentation'
+import { GeistPixelSquare } from 'geist/font/pixel'
 import { Barlow } from 'next/font/google'
 import localFont from 'next/font/local'
 import Script from 'next/script'
@@ -20,35 +21,29 @@ const barlow = Barlow({
   display: 'swap',
 })
 
-export const metadata: Metadata = {
-  title: 'Pascal Editor',
-  description: 'Standalone building editor',
-}
-
 export default function RootLayout({
   children,
 }: Readonly<{
   children: React.ReactNode
 }>) {
   return (
-    <html className={`${geistSans.variable} ${geistMono.variable} ${barlow.variable}`} lang="en">
+    <html
+      className={`${geistSans.variable} ${geistMono.variable} ${GeistPixelSquare.variable} ${barlow.variable}`}
+      lang="en"
+    >
       <head>
         {process.env.NODE_ENV === 'development' && (
-          <>
-            <Script
-              crossOrigin="anonymous"
-              src="//unpkg.com/react-scan/dist/auto.global.js"
-              strategy="beforeInteractive"
-            />
-            <Script
-              crossOrigin="anonymous"
-              src="//unpkg.com/react-grab/dist/index.global.js"
-              strategy="beforeInteractive"
-            />
-          </>
+          <Script
+            crossOrigin="anonymous"
+            src="//unpkg.com/react-scan/dist/auto.global.js"
+            strategy="beforeInteractive"
+          />
         )}
       </head>
-      <body className="font-sans">{children}</body>
+      <body className="font-sans">
+        {children}
+        {process.env.NODE_ENV === 'development' && <Agentation />}
+      </body>
     </html>
   )
 }

apps/editor/app/page.tsx

@@ -5,7 +5,7 @@ import { Editor } from '@pascal-app/editor'
 export default function Home() {
   return (
     <div className="h-screen w-screen">
-      <Editor />
+      <Editor projectId="local-editor" />
     </div>
   )
 }

apps/editor/package.json

@@ -17,13 +17,14 @@
     "@pascal-app/viewer": "*",
     "@react-three/drei": "^10.7.7",
     "@react-three/fiber": "^9.5.0",
-    "clsx": "^2.1.1",
-    "tailwind-merge": "^3.5.0",
     "@tailwindcss/postcss": "^4.2.1",
-    "next": "16.1.6",
+    "clsx": "^2.1.1",
+    "geist": "^1.7.0",
+    "next": "16.2.1",
     "postcss": "^8.5.6",
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
+    "tailwind-merge": "^3.5.0",
     "tailwindcss": "^4.2.1",
     "three": "^0.183.1"
   },
@@ -33,6 +34,7 @@
     "@types/node": "^22.19.12",
     "@types/react": "19.2.2",
     "@types/react-dom": "19.2.2",
+    "agentation": "^2.3.2",
     "react-grab": "^0.1.25",
     "react-scan": "^0.5.3",
     "tw-animate-css": "^1.4.0",