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/RTDataOverlayNoHydrationThenMPR.spec.ts

@@ -37,7 +37,7 @@ test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay me
 
   await checkForScreenshot(
     page,
-    page,
+    viewportPageObject.grid,
     screenShotPaths.rtDataOverlayNoHydrationThenMPR.rtDataOverlayNoHydrationPreMPR
   );
 
@@ -47,7 +47,7 @@ test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay me
 
   await checkForScreenshot(
     page,
-    page,
+    viewportPageObject.grid,
     screenShotPaths.rtDataOverlayNoHydrationThenMPR.rtDataOverlayNoHydrationPostMPR
   );