Add source field, UI filter, and import mapping

Introduce a 'source' property across types and API models, include it in convertApiToMedia, and add a Source input to AddMediaView. Add source-based filtering in BrowseView (dropdown + tag icon) and ensure Clear Filters resets source. Update playnite, stashapp, and xbvr importers to set source conditionally using a new SOURCE_CATEGORY_MAPPING constant (added to types) so sources are only applied for appropriate media categories.

src/lib/xbvrImporter.ts

@@ -1,5 +1,8 @@
 const BASE_URL = import.meta.env.VITE_API_URL;
 
+// Import the source mapping
+import { SOURCE_CATEGORY_MAPPING } from '@/types';
+
 export interface XBVRConfig {
   url: string;
   apiKey?: string;
@@ -308,6 +311,7 @@ export async function importFromXBVR(
           director: null,
           writer: null,
           releaseDate: releaseDate,
+          source: SOURCE_CATEGORY_MAPPING['xbvr']?.includes('Adult') ? 'xbvr' : null,
           genres: categories,
           tags: categories,
           studios: video.paysite?.name ? [video.paysite.name] : [],