test(app): stabilize offset observer test (#38044)

Co-authored-by: Aiden Cline <rekram1-node@users.noreply.github.com>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

packages/app/src/pages/session/timeline/observe-element-offset.test.ts

@@ -38,17 +38,17 @@ test("reports a divergent native offset once and ignores equal offsets and unrel
     instance.scrollOffset = offset
   })
 
-  document.body.append(unrelated)
-  unrelated.remove()
-  await frames(2)
-  expect(calls).toEqual([])
-
   route.remove()
   document.body.append(route)
   await new Promise((resolve) => setTimeout(resolve, 0))
   await frames(3)
   expect(calls).toEqual([[0, false]])
 
+  document.body.append(unrelated)
+  unrelated.remove()
+  await frames(2)
+  expect(calls).toEqual([[0, false]])
+
   route.remove()
   document.body.append(route)
   await new Promise((resolve) => setTimeout(resolve, 0))