Merge PR #1536 into 2.0.0-beta.2

# Conflicts:
#	ui/flutter/test/widget_test.dart

ui/flutter/lib/features/tasks/domain/task_record.dart

@@ -76,6 +76,7 @@ class TaskRecord {
     this.remaining,
     this.downloadDuration,
     this.createdAt,
+    this.doneAt,
     this.progress,
     this.error,
     this.completedLabel,
@@ -97,6 +98,7 @@ class TaskRecord {
   final String? remaining;
   final Duration? downloadDuration;
   final DateTime? createdAt;
+  final DateTime? doneAt;
   final double? progress;
   final String url;
   final String storagePath;
@@ -145,6 +147,7 @@ class TaskRecord {
       remainingSeconds: _remainingSeconds(task, totalBytes, downloadedBytes),
       downloadDuration: task.progress.used > 0 ? Duration(microseconds: (task.progress.used + 999) ~/ 1000) : null,
       createdAt: task.createdAt,
+      doneAt: task.doneAt,
       waiting: task.status == api_task.Status.wait,
       progress: progress,
       url: displayUrl,

ui/flutter/lib/features/tasks/presentation/widgets/task_drawer.dart

@@ -319,6 +319,14 @@ class _TaskInfoTab extends StatelessWidget {
           _InfoBlock(label: context.l10n.remaining, value: remaining),
         if (task.createdAt case final createdAt?)
           _InfoBlock(label: context.l10n.createdAt, value: _formatTaskDateTime(createdAt)),
+        if (task.status == TaskStatus.completed)
+          _InfoBlock(
+            label: context.l10n.doneAt,
+            value: switch (task.doneAt) {
+              final doneAt? => _formatTaskDateTime(doneAt),
+              _ => '—',
+            },
+          ),
         Container(
           key: const ValueKey('task-details-info-divider'),
           height: 1,