The scene view and the animation preview share one camera, the three form dialogs one base, and keys are found through one set of helpers (#85)

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/core/model/animationPreview.ts

@@ -5,7 +5,7 @@
  */
 import {
   animatableDefs,
-  animatableDefsOf,
+  animatedKindOf,
   frameCount,
   isPositionRow,
   PLACED_ROOT_ID,
@@ -18,9 +18,6 @@ import { instanceChildId, objectRef } from './instance';
 import { findAsset, type ObjectHolder, type Project } from './Project';
 import { resolveSceneObjectProps } from '../properties/resolve';
 
-/** The one object the preview places the root on – what a row aimed at the root itself writes to. */
-export const PREVIEW_ROOT_ID = PLACED_ROOT_ID;
-
 /**
  * The holder the preview draws at `frame`: a copy of the scene for a scene root, otherwise a holder
  * of one object placing the root at the origin, its content resolved from the template like any
@@ -50,7 +47,7 @@ export function previewHolder(
 /** The id the preview draws a row's target under – for a check that wants to look at it. */
 export function previewObjectId(root: Asset | undefined, target: string): string {
   if (root?.type === 'scene') return target;
-  return target === '' ? PREVIEW_ROOT_ID : instanceChildId(PREVIEW_ROOT_ID, target);
+  return target === '' ? PLACED_ROOT_ID : instanceChildId(PLACED_ROOT_ID, target);
 }
 
 /** Deep enough that nothing a row writes – a position, an override, an instance edit – is the document's. */
@@ -68,7 +65,7 @@ function sceneCopy(scene: ObjectHolder): ObjectHolder {
 }
 
 function placedHolder(root: Asset): ObjectHolder {
-  return { id: PREVIEW_ROOT_ID, type: 'container', name: root.name, props: {}, objects: [placedRoot(root)] };
+  return { id: PLACED_ROOT_ID, type: 'container', name: root.name, props: {}, objects: [placedRoot(root)] };
 }
 
 /** A row on the scene itself: its value goes into the copy's own properties. */
@@ -92,7 +89,7 @@ function writeObject(
   if (!ref || !asset) return;
   // Resolved, so a shader worn through an override or an instance edit brings its parameters (#104).
   const props = resolveSceneObjectProps(project, asset, ref.object);
-  const kind = animatableDefsOf(project, asset, props).find((d) => d.key === track.property)?.kind;
+  const kind = animatedKindOf(project, asset, props, track.property);
   if (!kind) return;
   const key = track.property;
   if (isPositionRow(asset.type, key)) {