Allow task completion even if signatories are still empty, put an indicator for completed tasks with incomplete details.

test/tasks_provider_test.dart

@@ -1,5 +1,6 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:tasq/providers/tasks_provider.dart';
+import 'package:tasq/models/task.dart';
 
 // Minimal fake supabase client similar to integration test work,
 // only implements the methods used by TasksController.
@@ -101,7 +102,7 @@ void main() {
       );
     });
 
-    test('cannot complete when signatories or action taken missing', () async {
+    test('cannot complete when action taken is missing', () async {
       // insert a task that has the basic request metadata but nothing else
       final row = {
         'id': 'tsk-3',
@@ -111,13 +112,14 @@ void main() {
       };
       fake.tables['tasks']!.add(row);
 
-      // still missing signatories/actionTaken
+      // missing actionTaken should still prevent completion even though
+      // signatories are not required.
       expect(
         () => controller.updateTaskStatus(taskId: 'tsk-3', status: 'completed'),
         throwsA(isA<Exception>()),
       );
 
-      // add signatories but actionTaken still missing
+      // add some signatories but no actionTaken yet
       await controller.updateTask(
         taskId: 'tsk-3',
         requestedBy: 'Alice',
@@ -129,7 +131,9 @@ void main() {
         throwsA(isA<Exception>()),
       );
 
-      // add action taken (empty JSON string)
+      // once action taken is provided completion should succeed even if
+      // signatories remain empty (they already have values here, but the
+      // previous checks show they aren't required).
       await controller.updateTask(taskId: 'tsk-3', actionTaken: '{}');
       await controller.updateTaskStatus(taskId: 'tsk-3', status: 'completed');
       expect(
@@ -143,11 +147,12 @@ void main() {
       final row = {'id': 'tsk-2', 'status': 'queued'};
       fake.tables['tasks']!.add(row);
 
-      // update metadata via updateTask
+      // update metadata via updateTask including actionTaken
       await controller.updateTask(
         taskId: 'tsk-2',
         requestType: 'Repair',
         requestCategory: 'Hardware',
+        actionTaken: '{}',
       );
 
       await controller.updateTaskStatus(taskId: 'tsk-2', status: 'completed');
@@ -156,5 +161,49 @@ void main() {
         'completed',
       );
     });
+
+    test('Task.hasIncompleteDetails flag works correctly', () {
+      final now = DateTime.now();
+      final base = Task(
+        id: 'x',
+        ticketId: null,
+        taskNumber: null,
+        title: 't',
+        description: '',
+        officeId: null,
+        status: 'completed',
+        priority: 1,
+        queueOrder: null,
+        createdAt: now,
+        creatorId: null,
+        startedAt: null,
+        completedAt: now,
+        // leave all optional metadata null
+      );
+      expect(base.hasIncompleteDetails, isTrue);
+
+      final full = Task(
+        id: 'x',
+        ticketId: null,
+        taskNumber: null,
+        title: 't',
+        description: '',
+        officeId: null,
+        status: 'completed',
+        priority: 1,
+        queueOrder: null,
+        createdAt: now,
+        creatorId: null,
+        startedAt: null,
+        completedAt: now,
+        requestedBy: 'A',
+        notedBy: 'B',
+        receivedBy: 'C',
+        requestType: 'foo',
+        requestCategory: 'bar',
+        actionTaken: '{}',
+      );
+      expect(full.hasIncompleteDetails, isFalse);
+    });
   });
 }