Add Transmission/NZBGet and per-client paths and much more

Extend multi-download-client support to include Transmission and NZBGet and introduce per-client custom download paths. Adds protocol mapping and new client types, Transmission/NZBGet integration services, API CRUD and validation changes, UI components/modal updates and live path previews, and manager routing by protocol. Includes DB migrations (download_path on download_history, interactive_search_access on users), schema updates, and related processor/service fixes and tests to ensure backward compatibility and proper path resolution.

tests/components/admin/indexers/IndexerConfigModal.test.tsx

@@ -51,7 +51,7 @@ describe('IndexerConfigModal', () => {
     expect(onClose).toHaveBeenCalledTimes(1);
   });
 
-  it('validates that at least one category is selected', () => {
+  it('shows warning when all audiobook categories are deselected but still allows save', () => {
     const onSave = vi.fn();
 
     render(
@@ -72,11 +72,18 @@ describe('IndexerConfigModal', () => {
     }
 
     fireEvent.click(within(audiobookRow).getByRole('switch'));
+
+    // Warning should be shown instead of blocking save
+    expect(screen.getByText(/will not be searched for audiobooks/i)).toBeInTheDocument();
+
     fireEvent.click(screen.getByRole('button', { name: 'Add Indexer' }));
 
-    // Component now shows specific error for audiobook categories
-    expect(screen.getByText('At least one audiobook category must be selected')).toBeInTheDocument();
-    expect(onSave).not.toHaveBeenCalled();
+    // Save should still be called with empty audiobook categories
+    expect(onSave).toHaveBeenCalledWith(
+      expect.objectContaining({
+        audiobookCategories: [],
+      })
+    );
   });
 
   it('forces RSS to false when the indexer does not support RSS', () => {

tests/components/requests/RequestCard.test.tsx

@@ -34,6 +34,22 @@ vi.mock('next/image', () => ({
   default: (props: any) => <img {...props} />,
 }));
 
+vi.mock('@/contexts/PreferencesContext', () => ({
+  usePreferences: () => ({ squareCovers: false, setSquareCovers: vi.fn(), cardSize: 5, setCardSize: vi.fn() }),
+}));
+
+vi.mock('@/contexts/AuthContext', () => ({
+  useAuth: () => ({
+    user: { id: 'user-1', role: 'user', permissions: { interactiveSearch: true } },
+    accessToken: 'test-token',
+    isLoading: false,
+    login: vi.fn(),
+    logout: vi.fn(),
+    refreshToken: vi.fn(),
+    setAuthData: vi.fn(),
+  }),
+}));
+
 const baseRequest = {
   id: 'req-1',
   status: 'pending',

tests/components/ui/VersionBadge.test.tsx

@@ -30,13 +30,16 @@ describe('VersionBadge', () => {
   it('renders semantic version from build-time env var', async () => {
     process.env.NEXT_PUBLIC_APP_VERSION = '1.0.0';
     process.env.NEXT_PUBLIC_GIT_COMMIT = 'abcdef1234';
-    const fetchMock = vi.fn();
+    const fetchMock = vi.fn().mockResolvedValue({
+      json: async () => ({ version: '1.0.0' }),
+    });
     vi.stubGlobal('fetch', fetchMock);
 
     render(<VersionBadge />);
 
     expect(await screen.findByText('v1.0.0')).toBeInTheDocument();
-    expect(fetchMock).not.toHaveBeenCalled();
+    // Should not call /api/version since build-time version is available
+    expect(fetchMock).not.toHaveBeenCalledWith('/api/version');
   });
 
   it('falls back to API when build-time version is unavailable', async () => {