feat(webui): migrate stats page to react

- move the stats route onto the React shell with Recharts-based visualizations
- remove the global Chart.js include and add a local stats seed script for easier testing
- keep parity coverage with route, API, and helper tests while preserving the legacy page layout

webui/src/platform/shell/globals.d.ts

@@ -62,6 +62,28 @@ declare global {
       showLoadingOverlay: (message?: string) => void;
       hideLoadingOverlay: () => void;
     };
+    navigateToArtistDetail?: (
+      artistId: string | number,
+      artistName: string,
+      sourceOverride?: string | null,
+      options?: Record<string, unknown>,
+    ) => void;
+    playLibraryTrack?: (
+      track: {
+        id: string | number;
+        title: string;
+        file_path: string;
+        bitrate?: string | number | null;
+        artist_id?: string | number | null;
+        album_id?: string | number | null;
+        _stats_image?: string | null;
+      },
+      albumTitle: string,
+      artistName: string,
+    ) => void | Promise<void>;
+    startStream?: (searchResult: Record<string, unknown>) => void | Promise<void>;
+    showLoadingOverlay?: (message?: string) => void;
+    hideLoadingOverlay?: () => void;
   }
 }