test: make Preview3D camera restore deterministic

Set a non-default Load3D camera state through real canvas interaction before queueing so Preview3D receives camera info consistently in CI.

browser_tests/tests/load3d/preview3dExecution.spec.ts

@@ -29,6 +29,34 @@ async function seedLoad3dWithCubeObj(
   await comfyPage.nextFrame()
 }
 
+async function setNonDefaultLoad3dCameraState(
+  pipeline: Preview3DPipelineContext
+): Promise<void> {
+  const { comfyPage, load3d } = pipeline
+  const box = await load3d.canvas.boundingBox()
+  expect(box, 'Load3D canvas bounding box should exist').not.toBeNull()
+
+  const startX = box!.x + box!.width * 0.5
+  const startY = box!.y + box!.height * 0.5
+  await comfyPage.page.mouse.move(startX, startY)
+  await comfyPage.page.mouse.down()
+  await comfyPage.page.mouse.move(startX + 80, startY + 20, {
+    steps: 10
+  })
+  await comfyPage.page.mouse.up()
+  await comfyPage.nextFrame()
+
+  await expect
+    .poll(
+      () =>
+        pipeline.getCameraStateFromProperties(
+          Preview3DPipelineContext.loadNodeId
+        ),
+      { timeout: 10_000 }
+    )
+    .not.toBeNull()
+}
+
 async function alignPreview3dWorkflowUiSettings(
   pipeline: Preview3DPipelineContext
 ): Promise<void> {
@@ -91,6 +119,7 @@ test.describe('Preview3D execution flow', { tag: ['@node', '@slow'] }, () => {
     test.setTimeout(180_000)
 
     await seedLoad3dWithCubeObj(pipeline)
+    await setNonDefaultLoad3dCameraState(pipeline)
 
     await pipeline.comfyPage.command.executeCommand('Comfy.QueuePrompt')