Save scroll position and state in right panel #137
Description
Description
The right panel (aside) currently loses its scroll position and state when the user navigates or interacts with different posts. The panel's scroll position and state should be preserved.
Context
The main PostList already implements scroll position saving via sessionStorage (scrollY:{path}). A similar approach should be applied to the right panel so users don't lose their place when switching between posts or navigating.
Acceptance Criteria
- Right panel scroll position is saved when switching active posts
- Scroll position is restored when returning to a previously viewed post's related stacks
- State feels seamless during normal browsing