fix(app): display study not found message for all modes (#5752)

* fix(app): move study validation to ModeRoute component

- Moved validation from defaultRouteInit.ts to Mode.tsx
- Added dedicated useEffect hook for study validation

* test: add Playwright test for study not found error page across multiple modes

extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx

@@ -122,11 +122,6 @@ function PanelStudyBrowser({
         studyInstanceUid: StudyInstanceUID,
       });
 
-      if (!qidoForStudyUID?.length) {
-        navigate('/notfoundstudy', '_self');
-        throw new Error('Invalid study URL');
-      }
-
       let qidoStudiesForPatient = qidoForStudyUID;
 
       // try to fetch the prior studies based on the patientID if the