- Introduce unified View hierarchy (VIEW_TREE) with parent/child relationships
- Add useViewRouter for navigate(), goBack(), openArticle(), and dynamic child navigation
- Replace legacy boolean-based view flags with single ui.view state
- Implement dynamic component rendering via VIEW_COMPONENTS map
- Add HomeView wrapper and integrate dynamic navigation props
- Update ArticleView to use open_editor and new ArticleViewProps
- Adjust ArticleEditor props type to accept null article
- Normalize navigation prop naming (open_* passed as onBack/onEdit via router)
- Enforce validation: prevent article updates without logged-in user
- Remove old conditional rendering/switch blocks and simplify Blog.tsx
- Version bump: 0.2.3 → 0.2.4
