test(e2e): update Playwright screenshots and add better tests and assertions for area calculations (#6022)

* Add (better) assertions for area calculation fixes.
* Add SVG and measurement side panel area for freehand ROI test.
* Add Playwright viewport screenshot scope migration guide.
* Update cornerstonjs dependencies to 4.22.8. Ensure all versions of @babel/preset-env are 7.29.5.

---------

Co-authored-by: Ghadeer Albattarni <165973963+GhadeerAlbattarni@users.noreply.github.com>

tests/CobbAngle.spec.ts

@@ -21,5 +21,10 @@ test('should display the cobb angle tool', async ({
     { x: 625, y: 291 },
   ]);
   await DOMOverlayPageObject.viewport.measurementTracking.confirm.click();
-  await checkForScreenshot(page, page, screenShotPaths.cobbangle.cobbangleDisplayedCorrectly);
+
+  await checkForScreenshot(
+    page,
+    viewportPageObject.grid,
+    screenShotPaths.cobbangle.cobbangleDisplayedCorrectly
+  );
 });