ItemView component: refactor to have separate components for each section

ItemView component is quite a big one (1994 lines of code) so it is hard to read it and maintain. This ticket aims to break it down into separate child components for each page section (accordion content), so the final structure should look like this:

• Follow the Single Responsibility Principle (SRP): Each component should handle only one responsibility.

• Extract subcomponents: If a JSX block inside return grows too large, move it into a separate component.

• Lift state up if multiple components need access to it.

• Use useMemo and useCallback if needed to prevent unnecessary recalculations and re-renders.

• Use useQuery for requests.

• Write unit tests with Jest + React Testing Library for new logic.

• Check for accessibility issues.