Refactor asset types and improve UI primitives

Replaces usage of the Asset type with AssetInput across editor components and hooks for consistency with core types. Adds default dimensions fallback for asset placement logic. Refactors UI primitives (button, sidebar, opacity control) to support forwarding refs and asChild prop, and updates imports for primitives. Updates Radix UI dependencies in package.json and bun.lock.

apps/editor/app/viewer/[id]/viewer-overlay.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { type AnyNode, type BuildingNode, type LevelNode, type ZoneNode, useScene } from '@pascal-app/core'
+import { type AnyNode, type AnyNodeId, type BuildingNode, type LevelNode, type ZoneNode, useScene } from '@pascal-app/core'
 import { useViewer } from '@pascal-app/viewer'
 import { Box, ChevronRight, Diamond, Eye, EyeOff, Image, Layers, Layers2 } from 'lucide-react'
 
@@ -28,16 +28,16 @@ export const ViewerOverlay = () => {
 
   // Get the first selected item (if any)
   const selectedNode = selection.selectedIds.length > 0
-    ? (nodes[selection.selectedIds[0]!] as AnyNode | undefined)
+    ? (nodes[selection.selectedIds[0] as AnyNodeId] as AnyNode | undefined)
     : null
 
   // Get all levels for the selected building
   const levels = building?.children
-    .map((id) => nodes[id] as LevelNode | undefined)
+    .map((id) => nodes[id as AnyNodeId] as LevelNode | undefined)
     .filter((n): n is LevelNode => n?.type === 'level')
     .sort((a, b) => a.level - b.level) ?? []
 
-  const handleLevelClick = (levelId: string) => {
+  const handleLevelClick = (levelId: LevelNode['id']) => {
     // When switching levels, deselect zone and items
     useViewer.getState().setSelection({ levelId })
   }

apps/editor/app/viewer/[id]/viewer-zone-system.tsx

@@ -21,7 +21,7 @@ export const ViewerZoneSystem = () => {
       // 2. Zone is not on the selected level
       // 3. A zone is already selected (hide all zones to show zone contents)
       const isOnSelectedLevel = zone.parentId === levelId
-      const shouldShow = levelId && isOnSelectedLevel && !zoneId
+      const shouldShow = !!levelId && isOnSelectedLevel && !zoneId
 
       obj.visible = shouldShow