Transform: scale, rotation and mirror as properties, world transform as a matrix chain, oriented colliders (#76)

Four new rows on sprite, text, collider and container (block TRANSFORM):
scale, rotation in degrees clockwise, mirrorX, mirrorY. As properties they
get override/reset/apply, loading of old projects, write-back after play and
the Properties node for free; camera and behavior have none.

The hierarchy composes T*R*S per level (composeAlongChain replaces
sumAlongChain), so children rotate and scale with their parent. Reparenting
and grouping keep the look (carriedTransform). Drawing goes through
placeNode, the gizmo is a polygon, cull and objectRect use the AABB, drags
are computed in the parent's system.

Colliders are oriented boxes: SAT for box/box, box-circle in the box frame;
exitDistance replaces axisSeparation/axisCorrection, moveAndSlide moves along
the object's own axes.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/editor/inspector/objectSection.ts

@@ -28,6 +28,7 @@ import type { SceneObject } from '../../core/model/SceneObject';
 import {
   COMMON_PROPS,
   isCommonProp,
+  isTransformProp,
   type PropertyDef,
   schemaFor,
   schemaForObject,
@@ -155,6 +156,11 @@ export function buildObjectSection(host: InspectorHost, holderId: string, object
     });
   }
 
+  // Turn, size and mirror sit with the position: together they are where the object is.
+  const transform = schemaForObject(project, asset, object).filter((def) => isTransformProp(def.key));
+  if (transform.length > 0) addTitle(host, 'TRANSFORM');
+  for (const def of transform) propertyRow(host, holderId, objectId, asset, def, resolved);
+
   // Where the object is *drawn* in the viewport, nothing else – for pulling stacked objects apart.
   addTitle(host, 'EDITOR OFFSET (SCENE VIEW ONLY)');
   for (const axis of OFFSET_AXES) {