test(beta): stabilize Design drag and culling baselines (#5458)

Author: steve8708

e2e/beta/specs/apps/design-culling.spec.ts

@@ -190,6 +190,12 @@ test("Design culling preserves a bounded preview pool during physical pan and zo
     );
     const surfaceBox = await surface.boundingBox();
     if (!surfaceBox) throw new Error("missing overview canvas surface");
+    await Promise.all(
+      page
+        .frames()
+        .filter((frame) => frame !== page.mainFrame())
+        .map((frame) => frame.waitForLoadState("load")),
+    );
     await resetChurn(page);
     await page.mouse.move(
       surfaceBox.x + surfaceBox.width / 2,

e2e/beta/specs/apps/design-interactions.spec.ts

@@ -1055,9 +1055,11 @@ test.describe("authenticated beta Design interactions", () => {
         NESTED_FRAME_ID,
       );
 
-      await page.mouse.move(sourceBox.x + 18, sourceBox.y + 11);
+      const grabX = sourceBox.x + sourceBox.width / 2;
+      const grabY = sourceBox.y + sourceBox.height / 2;
+      await page.mouse.move(grabX, grabY);
       await page.mouse.down();
-      await page.mouse.move(sourceBox.x + 6, sourceBox.y + 11, { steps: 4 });
+      await page.mouse.move(grabX - 12, grabY, { steps: 4 });
       await page.mouse.move(
         targetBox.x + targetBox.width / 2,
         targetBox.y + targetBox.height / 2,