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.

packages/viewer/src/systems/scan/scan-system.tsx

@@ -1,4 +1,4 @@
-import { emitter, sceneRegistry } from '@pascal-app/core'
+import { sceneRegistry } from '@pascal-app/core'
 import { useEffect } from 'react'
 import useViewer from '../../store/use-viewer'
 
@@ -15,29 +15,5 @@ export const ScanSystem = () => {
     })
   }, [showScans])
 
-  useEffect(() => {
-    const hideForCapture = () => {
-      const scans = sceneRegistry.byType.scan || new Set()
-      scans.forEach((scanId) => {
-        const node = sceneRegistry.nodes.get(scanId)
-        if (node) node.visible = false
-      })
-    }
-    const restoreAfterCapture = () => {
-      const showScansNow = useViewer.getState().showScans
-      const scans = sceneRegistry.byType.scan || new Set()
-      scans.forEach((scanId) => {
-        const node = sceneRegistry.nodes.get(scanId)
-        if (node) node.visible = showScansNow
-      })
-    }
-    emitter.on('thumbnail:before-capture', hideForCapture)
-    emitter.on('thumbnail:after-capture', restoreAfterCapture)
-    return () => {
-      emitter.off('thumbnail:before-capture', hideForCapture)
-      emitter.off('thumbnail:after-capture', restoreAfterCapture)
-    }
-  }, [])
-
   return null
 }