Implemented subject suggestions in Task Creation and Edit.

Fix editing redirects

lib/screens/tasks/tasks_list_screen.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_typeahead/flutter_typeahead.dart';
 import 'package:tasq/utils/app_time.dart';
 import 'package:go_router/go_router.dart';
 
@@ -23,6 +24,7 @@ import '../../widgets/tasq_adaptive_list.dart';
 import '../../widgets/typing_dots.dart';
 import '../../theme/app_surfaces.dart';
 import '../../utils/snackbar.dart';
+import '../../utils/subject_suggestions.dart';
 
 // request metadata options used in task creation/editing dialogs
 const List<String> _requestTypeOptions = [
@@ -565,6 +567,14 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen>
   ) async {
     final titleController = TextEditingController();
     final descriptionController = TextEditingController();
+    final existingSubjects = <String>[
+      ...((ref.read(tasksProvider).valueOrNull ?? const <Task>[]).map(
+        (task) => task.title,
+      )),
+      ...((ref.read(ticketsProvider).valueOrNull ?? const <Ticket>[]).map(
+        (ticket) => ticket.subject,
+      )),
+    ];
     String? selectedOfficeId;
     String? selectedRequestType;
     String? requestTypeOther;
@@ -585,12 +595,30 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen>
                 child: Column(
                   mainAxisSize: MainAxisSize.min,
                   children: [
-                    TextField(
-                      controller: titleController,
-                      decoration: const InputDecoration(
-                        labelText: 'Task title',
+                    TypeAheadFormField<String>(
+                      textFieldConfiguration: TextFieldConfiguration(
+                        controller: titleController,
+                        decoration: const InputDecoration(
+                          labelText: 'Task title',
+                        ),
+                        enabled: !saving,
                       ),
-                      enabled: !saving,
+                      suggestionsCallback: (pattern) async {
+                        return SubjectSuggestionEngine.suggest(
+                          existingSubjects: existingSubjects,
+                          query: pattern,
+                          limit: 8,
+                        );
+                      },
+                      itemBuilder: (context, suggestion) =>
+                          ListTile(dense: true, title: Text(suggestion)),
+                      onSuggestionSelected: (suggestion) {
+                        titleController
+                          ..text = suggestion
+                          ..selection = TextSelection.collapsed(
+                            offset: suggestion.length,
+                          );
+                      },
                     ),
                     const SizedBox(height: 12),
                     TextField(
@@ -710,7 +738,10 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen>
                   onPressed: saving
                       ? null
                       : () async {
-                          final title = titleController.text.trim();
+                          final title =
+                              SubjectSuggestionEngine.normalizeDisplay(
+                                titleController.text.trim(),
+                              );
                           final description = descriptionController.text.trim();
                           final officeId = selectedOfficeId;
                           if (title.isEmpty || officeId == null) {