* 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
This was done by using an array of representation types instead of a single type for a panel.
The first element of the array is the primary type of the panel, and the rest are secondary types
that can also be displayed in the panel.
PR feedback:
- added test to check number of segments in side panel for 3D only view
- fixed jumping to segment in 3D only view
- fixed exception when adding contour segment in 3D only view
