- Moved all editor action buttons (copy, format, undo, redo, reset) from `src/components/features/playground/workspace/editor/components/` to new location `src/features/problems/code/components/toolbar/actions/`
- Introduced shared `TooltipButton` component to reduce duplication
- Created centralized `useProblemEditorActions` hook for common editor operations
- Updated imports and exports through new index file
- Maintained all existing functionality while improving code organization
- Simplify ProblemLayout to use children prop and remove ProblemStoreProvider
- Replace PlaygroundHeader with dedicated ProblemHeader component
- Streamline ProblemsetLayout with new ProblemsetHeader
- Remove deprecated BackButton in favor of NavigateBackButton
- Delete unused ProblemStoreProvider and related dependencies
- Remove old parallel route implementations (@Description and @Solutions)
- Add new feature-based components for problem description and solution
- Create content and panel components for both features
- Implement skeleton loading states
- Use cached data fetching
- Update MDX rendering and scroll area implementations