Implements a Zustand store with hydration and persistence patterns. The store manages documents, settings, and UI state, with selective subscriptions to avoid unnecessary re-renders. It uses localStorage for persistence with a 2-second debounce and a hydration mechanism via StoreProvider to ensure client-side state is loaded before rendering. This pattern is self-contained and can be extracted into any React project requiring client-side state persistence.

Provides the core Markdown rendering pipeline using markdown-it with 11 plugins (including KaTeX, syntax highlighting, footnotes, task lists, and emoji). The renderer is dynamically imported to avoid SSR issues, and output is sanitized with DOMPurify. The plugin chain is configurable and demonstrates a clean, extensible pattern for building a secure Markdown renderer. This module can be extracted and reused in any Node.js or browser Markdown processing context.

A context-based toast notification system with a provider and useToast hook. It supports multiple toast types (success, error, info), auto-dismiss, and dynamic creation. The component is fully self-contained, uses React context for state management, and can be dropped into any React application without external dependencies. It demonstrates a clean, reusable pattern for global UI notifications.