feat(downloads): add live limits clipboard capture and byte progress

src/utils/downloadProgress.test.ts

@@ -0,0 +1,23 @@
+import { describe, expect, it } from 'vitest';
+import { formatDownloadBytes, resolveDownloadSizeDisplay } from './downloadProgress';
+
+describe('download progress size display', () => {
+  it('formats byte counts using the binary units used by the download engines', () => {
+    expect(formatDownloadBytes(0)).toBe('0 B');
+    expect(formatDownloadBytes(1.2 * 1024 ** 3)).toBe('1.20 GB');
+  });
+
+  it('keeps estimated totals distinguishable from exact totals', () => {
+    expect(resolveDownloadSizeDisplay({
+      downloadedBytes: 1.2 * 1024 ** 3,
+      totalBytes: 2.4 * 1024 ** 3,
+      totalIsEstimate: true,
+      fallbackSize: 'Unknown'
+    })).toEqual({
+      downloaded: '1.20 GB',
+      total: '2.40 GB',
+      totalIsEstimate: true,
+      fallback: 'Unknown'
+    });
+  });
+});