Editor offset, global On click, Coin container in the jump-and-run seed

- SceneObject.editorOffset (x/y): shifts only where an object is drawn in
  the Scene tab, cascades to children, undo-able with a reset action.
  Never written into container templates.
- On click without an owner now fires for any click inside the camera
  frame instead of hit-testing the (editor-only) behavior symbol.
- seed-jumprun: coins are a "Coin" container (sprite + trigger), nested
  containers are expanded recursively, Destroy targets the coin's parent,
  and the clock uses a Ceil node instead of ToText.

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

src/runtime/systems/BehaviorSystem.ts

@@ -84,8 +84,11 @@ export class BehaviorSystem implements System {
           }
         }
         this.fireCollisions(instance, i, ctx);
+        // With an owner the click has to land on it; a behavior without one has no shape to
+        // be hit, so it listens to the whole game view (anywhere inside the camera frame).
         const pointer = world.pointer;
-        if (pointer.pressed && world.hitTest(instance.entity.parent ?? instance.entity, pointer.x, pointer.y)) {
+        const owner = instance.entity.parent;
+        if (pointer.pressed && (owner ? world.hitTest(owner, pointer.x, pointer.y) : pointer.inside)) {
           i.fire('OnClick', ctx, { x: pointer.x, y: pointer.y });
         }
         i.fire('OnUpdate', ctx, { dt });