Use Zustand store; modularize API & routes

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.

src/lib/xbvrImporter.ts

@@ -1,7 +1,7 @@
 const BASE_URL = import.meta.env.VITE_API_URL;
 
-// Import the source mapping
-import { SOURCE_CATEGORY_MAPPING } from '@/types';
+// Import the source mapping and types
+import { SOURCE_CATEGORY_MAPPING, Media, Staff } from '@/types';
 
 export interface XBVRConfig {
   url: string;
@@ -83,7 +83,7 @@ export async function importFromXBVR(
     const existingMediaResponse = await fetch(`${BASE_URL}/api/media?limit=1000`);
     const existingMediaData = await existingMediaResponse.json();
     const existingTitles = new Set(
-      existingMediaData.data?.items?.map((m: any) => m.title) || []
+      existingMediaData.data?.items?.map((m: Media) => m.title) || []
     );
     logCallback(`Found ${existingTitles.size} existing videos in database`);
 
@@ -91,7 +91,7 @@ export async function importFromXBVR(
     const existingCastResponse = await fetch(`${BASE_URL}/api/cast?limit=1000`);
     const existingCastData = await existingCastResponse.json();
     const existingActors = new Map(
-      (existingCastData.data?.items || []).map((c: any) => [c.name, c])
+      (existingCastData.data?.items || []).map((c: Staff) => [c.name, c])
     );
     logCallback(`Found ${existingActors.size} existing actors in database`);