show upload progress from toolbar popover

test/upload_progress_test.dart

@@ -0,0 +1,34 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:guangya_flutter/providers/file_provider.dart';
+
+void main() {
+  test('UploadProgress reports byte-based progress when bytes are known', () {
+    const progress = UploadProgress(
+      totalFiles: 3,
+      completedFiles: 1,
+      failedFiles: 0,
+      totalBytes: 400,
+      transferredBytes: 100,
+      currentFileName: 'movie.mkv',
+      isActive: true,
+    );
+
+    expect(progress.processedFiles, 1);
+    expect(progress.fraction, 0.25);
+  });
+
+  test('UploadProgress falls back to processed files for empty files', () {
+    const progress = UploadProgress(
+      totalFiles: 2,
+      completedFiles: 1,
+      failedFiles: 1,
+      totalBytes: 0,
+      transferredBytes: 0,
+      currentFileName: '',
+      isActive: false,
+    );
+
+    expect(progress.processedFiles, 2);
+    expect(progress.fraction, 1);
+  });
+}