Split software arch desc for easier manintenance. Many fixes related to next video playing and remote playback

src/lib/components/library/TrackList.test.ts

@@ -34,6 +34,19 @@ vi.mock("./DownloadButton.svelte", () => ({
   default: vi.fn(() => ({ $$: {}, $set: vi.fn(), $on: vi.fn(), $destroy: vi.fn() })),
 }));
 
+vi.mock("$lib/stores/library", () => ({
+  library: {
+    loadLibraries: vi.fn(),
+    loadItems: vi.fn(),
+    loadItem: vi.fn(),
+    setCurrentLibrary: vi.fn(),
+  },
+  libraries: { subscribe: vi.fn((fn: any) => { fn([]); return () => {}; }) },
+  libraryItems: { subscribe: vi.fn((fn: any) => { fn([]); return () => {}; }) },
+  currentLibrary: { subscribe: vi.fn((fn: any) => { fn(null); return () => {}; }) },
+  isLibraryLoading: { subscribe: vi.fn((fn: any) => { fn(false); return () => {}; }) },
+}));
+
 // Now import the modules after mocks are set up
 import { render, fireEvent, waitFor } from "@testing-library/svelte";
 import { invoke } from "@tauri-apps/api/core";