sync: update core and viewer from monorepo (#143)

Major changes:
- Roof system rewrite with roof-segment support
- Scene store refactor
- Spatial grid improvements
- Item light system
- Post-processing and selection manager updates
- Perf monitor component

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/viewer/src/store/use-item-light-pool.ts

@@ -0,0 +1,53 @@
+import type { AnyNodeId, Interactive, LightEffect, SliderControl } from '@pascal-app/core'
+import { create } from 'zustand'
+
+export type LightRegistration = {
+  nodeId: AnyNodeId
+  effect: LightEffect
+  toggleIndex: number
+  sliderIndex: number
+  sliderMin: number
+  sliderMax: number
+  hasSlider: boolean
+}
+
+type ItemLightPoolStore = {
+  registrations: Map<string, LightRegistration>
+  register: (key: string, nodeId: AnyNodeId, effect: LightEffect, interactive: Interactive) => void
+  unregister: (key: string) => void
+}
+
+export const useItemLightPool = create<ItemLightPoolStore>((set) => ({
+  registrations: new Map(),
+
+  register: (key, nodeId, effect, interactive) => {
+    const toggleIndex = interactive.controls.findIndex((c) => c.kind === 'toggle')
+    const sliderIndex = interactive.controls.findIndex((c) => c.kind === 'slider')
+    const sliderControl =
+      sliderIndex >= 0 ? (interactive.controls[sliderIndex] as SliderControl) : null
+
+    const registration: LightRegistration = {
+      nodeId,
+      effect,
+      toggleIndex,
+      sliderIndex,
+      hasSlider: sliderControl !== null,
+      sliderMin: sliderControl?.min ?? 0,
+      sliderMax: sliderControl?.max ?? 1,
+    }
+
+    set((s) => {
+      const next = new Map(s.registrations)
+      next.set(key, registration)
+      return { registrations: next }
+    })
+  },
+
+  unregister: (key) => {
+    set((s) => {
+      const next = new Map(s.registrations)
+      next.delete(key)
+      return { registrations: next }
+    })
+  },
+}))

packages/viewer/src/store/use-viewer.ts

@@ -61,6 +61,9 @@ type ViewerState = {
   exportScene: (() => Promise<void>) | null
   setExportScene: (fn: (() => Promise<void>) | null) => void
 
+  debugColors: boolean
+  setDebugColors: (enabled: boolean) => void
+
   cameraDragging: boolean
   setCameraDragging: (dragging: boolean) => void
 }
@@ -173,6 +176,9 @@ const useViewer = create<ViewerState>()(
       exportScene: null,
       setExportScene: (fn) => set({ exportScene: fn }),
 
+      debugColors: false,
+      setDebugColors: (enabled) => set({ debugColors: enabled }),
+
       cameraDragging: false,
       setCameraDragging: (dragging) => set({ cameraDragging: dragging }),
     }),