Fix unit tests

new file:   src/components/PickItemRow.narrow.test.tsx
	new file:   src/components/ProductRow.additional.test.tsx
	new file:   src/platform/web.test.ts
	modified:   src/screens/ManageProductsScreen.test.tsx
	new file:   src/services/importExportService.additional.test.ts

src/platform/web.test.ts

@@ -0,0 +1,67 @@
+// src/platform/web.test.ts
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { isOnline, triggerDownload } from './web';
+
+describe('platform web utilities', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('isOnline uses navigator.onLine when available', () => {
+    const originalNavigator = (globalThis as any).navigator;
+    try {
+      vi.stubGlobal('navigator', { onLine: false } as any);
+      expect(isOnline()).toBe(false);
+
+      vi.stubGlobal('navigator', { onLine: true } as any);
+      expect(isOnline()).toBe(true);
+    } finally {
+      if (originalNavigator !== undefined) {
+        vi.stubGlobal('navigator', originalNavigator);
+      } else {
+        vi.unstubAllGlobals();
+      }
+    }
+  });
+
+  it('isOnline returns true when navigator missing', () => {
+    const originalNavigator = (globalThis as any).navigator;
+    try {
+      vi.stubGlobal('navigator', undefined as any);
+      expect(isOnline()).toBe(true);
+    } finally {
+      if (originalNavigator !== undefined) {
+        vi.stubGlobal('navigator', originalNavigator);
+      } else {
+        vi.unstubAllGlobals();
+      }
+    }
+  });
+
+  it('triggerDownload calls createObjectURL, click and revokeObjectURL', () => {
+    const createObjectURL = vi.fn().mockReturnValue('blob:fake');
+    const revokeObjectURL = vi.fn();
+    vi.stubGlobal('URL', { createObjectURL, revokeObjectURL } as any);
+
+    const clickMock = vi.fn();
+    const anchor: any = { href: '', download: '', click: clickMock };
+
+    const origCreateElement = document.createElement.bind(document);
+    (document as any).createElement = (tag: string) => {
+      if (tag === 'a') return anchor;
+      return origCreateElement(tag);
+    };
+
+    try {
+      const blob = new Blob(['hello'], { type: 'text/plain' });
+      triggerDownload(blob, 'file.txt');
+
+      expect(createObjectURL).toHaveBeenCalled();
+      expect(clickMock).toHaveBeenCalled();
+      expect(revokeObjectURL).toHaveBeenCalled();
+    } finally {
+      (document as any).createElement = origCreateElement;
+      vi.unstubAllGlobals();
+    }
+  });
+});