Introduce a centralized Zustand store and refactor app state out of App.tsx into src/store/appStore.ts. Modularize API surface by moving media/cast/settings/converters/types into src/lib/api/* and re-exporting from src/api.ts for backward compatibility. Replace inline route helpers with dedicated route components (MediaDetailRoute, CastDetailRoute, CategoryBrowseRoute) and wire CATEGORY_PATHS/PATH_TO_CATEGORY constants. Update AddMediaView UI (icons, layout) and adjust settings/category handling to use DEFAULT_SETTINGS and the store. Add zustand to package.json/package-lock.json and include a new React SKILL.md. Overall changes improve state management, API organization, and route/component separation for better maintainability and code-splitting.
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