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/MPRThenRTOverlayNoHydration.spec.ts

@@ -25,7 +25,7 @@ test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay me
 
   await checkForScreenshot(
     page,
-    page,
+    viewportPageObject.grid,
     screenShotPaths.mprThenRTOverlayNoHydration.mprPreRTOverlayNoHydration
   );
 
@@ -48,6 +48,7 @@ test('should launch MPR with unhydrated RTSTRUCT chosen from the data overlay me
 
   await checkForScreenshot({
     page,
+    locator: viewportPageObject.grid,
     screenshotPath: screenShotPaths.mprThenRTOverlayNoHydration.mprPostRTOverlayNoHydration,
     normalizedClip: { x: 0, y: 0, width: 1.0, height: 0.75 }, // clip to avoid any popups concerning surface creation and clipping
   });