Reset core/viewer/editor/mcp packages and apps/editor from private-editor

Wholesale swap of packages/{core,viewer,editor,mcp} and apps/editor with the
versions from the private editor repo, which is the production source of truth.

Setup changes:
- packages/{core,viewer,editor} versions held at 0.7.0 baseline (matching
  the most recent published release) so a bump=minor publishes 0.8.0
- packages/mcp held at 0.1.1 (never published; first publish will go through
  the new release.yml flow)
- peerDependencies and devDependencies for inter-package @pascal-app/*
  references pinned to ^0.7.0 instead of '*' / 'workspace:*' so they are
  valid for npm consumers
- Root package.json: TypeScript bumped to 6.0.2, added overrides for
  @types/react, @types/react-dom, @types/three to prevent JSX namespace
  fragmentation across the workspace
- release.yml extended to also publish editor and mcp; 'both' option renamed
  to 'all'; added a sync step that updates inter-package peerDeps/devDeps to
  match the new versions on every bump (so viewer/editor/mcp tarballs always
  reference the version of core they were built against)
- Root scripts gained release:editor and release:mcp shortcuts

Verification:
- bun install --frozen-lockfile is consistent
- packages/{core,viewer,mcp} build cleanly, dist/index.d.ts emitted
- packages/editor check-types reports 21 pre-existing errors, identical to
  what private-editor currently reports

Open PRs against editor-v2 will need rebasing/conflict resolution.

apps/editor/app/api/scenes/[id]/route.ts

@@ -173,7 +173,7 @@ function parseIfMatch(raw: string | null): number | undefined {
   const inner = match ? match[1] : trimmed
   if (!inner) return undefined
   const n = Number(inner)
-  if (!Number.isFinite(n) || !Number.isInteger(n) || n < 0) return undefined
+  if (!(Number.isFinite(n) && Number.isInteger(n)) || n < 0) return undefined
   return n
 }
 

apps/editor/app/globals.css

@@ -1,5 +1,6 @@
 @import "tailwindcss";
 @import "tw-animate-css";
+@import "../../../styles/elevation.css";
 @source "../../../packages/editor/src";
 
 @custom-variant dark (&:is(.dark *));

apps/editor/app/page.tsx

@@ -1,13 +1,36 @@
 'use client'
 
-import { Editor, type SidebarTab, ViewerToolbarLeft, ViewerToolbarRight } from '@pascal-app/editor'
+import {
+  Editor,
+  ItemsPanel,
+  type SidebarTab,
+  ViewerToolbarLeft,
+  ViewerToolbarRight,
+} from '@pascal-app/editor'
+import { Layers, Package, Settings } from 'lucide-react'
 import Link from 'next/link'
 
-const SIDEBAR_TABS: (SidebarTab & { component: React.ComponentType })[] = [
+const SIDEBAR_TABS = [
   {
     id: 'site',
     label: 'Scene',
-    component: () => null, // Built-in SitePanel handles this
+    component: () => null,
+    mobileDefaultSnap: 0.5,
+    mobileIcon: <Layers className="h-5 w-5" />,
+  },
+  {
+    id: 'items',
+    label: 'Items',
+    component: ItemsPanel,
+    mobileDefaultSnap: 0.5,
+    mobileIcon: <Package className="h-5 w-5" />,
+  },
+  {
+    id: 'settings',
+    label: 'Settings',
+    component: () => null,
+    mobileDefaultSnap: 0.5,
+    mobileIcon: <Settings className="h-5 w-5" />,
   },
 ]