PageScene: read camera/freeCamState/focalLengthToFov from CameraController

Phase 1 moved camera, freeCamState, and focalLengthToFov off Editor and
onto CameraController, but two camera-update blocks in PageEditor
(handleSelectCamera and handleAddCamera) still read editorEngine.camera,
editorEngine.focalLengthToFov, and editorEngine.freeCamState. Those
fields are undefined now, so the cam-update guards short-circuited and
the reset/random-camera buttons silently did nothing.

Sweep both blocks to read from editorEngine.cameraController.* and
collapse the chain into a local `cam` const.

frontend/apps/artcraft/app/src/pages/PageScene/PageEditor.tsx

@@ -186,32 +186,30 @@ export const PageEditor = () => {
       }, 1500);
 
       // Update the main camera to match the selected camera's properties
-      if (editorEngine.camera) {
-        // First update position and lookAt
-        editorEngine.camera.position.set(
+      const cam = editorEngine.cameraController.camera;
+      if (cam) {
+        cam.position.set(
           selectedCamera.position.x,
           selectedCamera.position.y,
           selectedCamera.position.z,
         );
-        editorEngine.camera.lookAt(
+        cam.lookAt(
           selectedCamera.lookAt.x,
           selectedCamera.lookAt.y,
           selectedCamera.lookAt.z,
         );
 
-        // Update FOV
-        editorEngine.camera.fov = editorEngine.focalLengthToFov(
+        cam.fov = editorEngine.cameraController.focalLengthToFov(
           selectedCamera.focalLength,
         );
-        editorEngine.camera.updateProjectionMatrix();
+        cam.updateProjectionMatrix();
 
         // Reset free-cam motion so a switch doesn't carry over a
         // half-applied drag from the previous camera.
-        if (editorEngine.freeCamState) {
-          editorEngine.freeCamState.velocity.set(0, 0, 0);
+        if (editorEngine.cameraController.freeCamState) {
+          editorEngine.cameraController.freeCamState.velocity.set(0, 0, 0);
         }
 
-        // Force a render to update the view
         editorEngine.renderScene();
       }
 
@@ -262,19 +260,19 @@ export const PageEditor = () => {
     setSelectedCameraId(newId);
 
     // Update the engine camera to match the new camera's properties
-    if (editorEngine && editorEngine.camera) {
-      editorEngine.camera.position.set(randomX, randomY, randomZ);
-      editorEngine.camera.lookAt(0, 0, 0);
-      editorEngine.camera.fov = editorEngine.focalLengthToFov(24);
-      editorEngine.camera.updateProjectionMatrix();
+    const cam = editorEngine?.cameraController.camera;
+    if (editorEngine && cam) {
+      cam.position.set(randomX, randomY, randomZ);
+      cam.lookAt(0, 0, 0);
+      cam.fov = editorEngine.cameraController.focalLengthToFov(24);
+      cam.updateProjectionMatrix();
 
       // Reset free-cam motion so the camera doesn't drift after
       // teleport.
-      if (editorEngine.freeCamState) {
-        editorEngine.freeCamState.velocity.set(0, 0, 0);
+      if (editorEngine.cameraController.freeCamState) {
+        editorEngine.cameraController.freeCamState.velocity.set(0, 0, 0);
       }
 
-      // Force a render to update the view
       editorEngine.renderScene();
     }
   };