feat(knowledge): add ProjectsScreen and ProjectEditScreen, sort projects by updated_at

lib/data/api/projects_api.dart

@@ -7,13 +7,17 @@ class ProjectsApi {
   final Dio _dio;
   const ProjectsApi(this._dio);
 
-  Future<List<Project>> getAll({String? status}) async {
+  Future<List<Project>> getAll({
+    String? status,
+    String sort = 'updated_at',
+    String order = 'desc',
+  }) async {
     try {
       final response = await _dio.get(
         '/api/projects',
         queryParameters: {
-          'sort': 'updated_at',
-          'order': 'desc',
+          'sort': sort,
+          'order': order,
           if (status != null) 'status': status,
         },
       );

lib/data/repositories/projects_repository.dart

@@ -5,7 +5,12 @@ class ProjectsRepository {
   final ProjectsApi _api;
   const ProjectsRepository(this._api);
 
-  Future<List<Project>> getAll({String? status}) => _api.getAll(status: status);
+  Future<List<Project>> getAll({
+    String? status,
+    String sort = 'updated_at',
+    String order = 'desc',
+  }) =>
+      _api.getAll(status: status, sort: sort, order: order);
   Future<Project> getOne(int id) => _api.getOne(id);
   Future<Project> create({
     required String title,

lib/providers/projects_provider.dart

@@ -10,7 +10,9 @@ final projectsProvider =
 class ProjectsNotifier extends AsyncNotifier<List<Project>> {
   @override
   Future<List<Project>> build() async {
-    return ref.watch(projectsRepositoryProvider).getAll();
+    return ref
+        .watch(projectsRepositoryProvider)
+        .getAll(sort: 'updated_at', order: 'desc');
   }
 
   Future<Project> create({

lib/screens/projects/project_edit_screen.dart

@@ -0,0 +1,164 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../core/exceptions.dart';
+import '../../providers/projects_provider.dart';
+
+class ProjectEditScreen extends ConsumerStatefulWidget {
+  final int? projectId;
+  const ProjectEditScreen({super.key, this.projectId});
+
+  @override
+  ConsumerState<ProjectEditScreen> createState() => _ProjectEditScreenState();
+}
+
+class _ProjectEditScreenState extends ConsumerState<ProjectEditScreen> {
+  final _titleController = TextEditingController();
+  final _descController = TextEditingController();
+  final _goalController = TextEditingController();
+  String _status = 'active';
+  bool _saving = false;
+  late final Future<void> _initFuture;
+
+  @override
+  void initState() {
+    super.initState();
+    _initFuture =
+        widget.projectId != null ? _loadExisting() : Future.value();
+  }
+
+  @override
+  void dispose() {
+    _titleController.dispose();
+    _descController.dispose();
+    _goalController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _loadExisting() async {
+    final projects = ref.read(projectsProvider).value ?? [];
+    final project =
+        projects.where((p) => p.id == widget.projectId).firstOrNull;
+    if (project != null) {
+      _titleController.text = project.title;
+      _descController.text = project.description ?? '';
+      _goalController.text = project.goal ?? '';
+      _status = project.status;
+    }
+  }
+
+  Future<void> _save() async {
+    final title = _titleController.text.trim();
+    if (title.isEmpty) {
+      ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(content: Text('Title is required.')));
+      return;
+    }
+    setState(() => _saving = true);
+    try {
+      if (widget.projectId == null) {
+        await ref.read(projectsProvider.notifier).create(
+              title: title,
+              description: _descController.text.trim().isEmpty
+                  ? null
+                  : _descController.text.trim(),
+              goal: _goalController.text.trim().isEmpty
+                  ? null
+                  : _goalController.text.trim(),
+            );
+      } else {
+        await ref.read(projectsProvider.notifier).updateProject(
+              widget.projectId!,
+              {
+                'title': title,
+                'description': _descController.text.trim(),
+                'goal': _goalController.text.trim(),
+                'status': _status,
+              },
+            );
+      }
+      if (mounted) context.pop();
+    } on AppException catch (e) {
+      if (mounted) {
+        ScaffoldMessenger.of(context)
+            .showSnackBar(SnackBar(content: Text(e.message)));
+      }
+    } finally {
+      if (mounted) setState(() => _saving = false);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+      future: _initFuture,
+      builder: (context, snapshot) => Scaffold(
+        appBar: AppBar(
+          title: Text(
+              widget.projectId == null ? 'New Project' : 'Edit Project'),
+          actions: [
+            IconButton(
+              icon: _saving
+                  ? const SizedBox(
+                      width: 20,
+                      height: 20,
+                      child: CircularProgressIndicator(strokeWidth: 2),
+                    )
+                  : const Icon(Icons.check),
+              onPressed: _saving ? null : _save,
+            ),
+          ],
+        ),
+        body: snapshot.connectionState == ConnectionState.waiting
+            ? const Center(child: CircularProgressIndicator())
+            : ListView(
+                padding: const EdgeInsets.all(16),
+                children: [
+                  TextField(
+                    controller: _titleController,
+                    decoration: const InputDecoration(
+                        labelText: 'Title *', border: OutlineInputBorder()),
+                    textInputAction: TextInputAction.next,
+                  ),
+                  const SizedBox(height: 12),
+                  TextField(
+                    controller: _descController,
+                    decoration: const InputDecoration(
+                        labelText: 'Description',
+                        border: OutlineInputBorder()),
+                    maxLines: 3,
+                    textInputAction: TextInputAction.next,
+                  ),
+                  const SizedBox(height: 12),
+                  TextField(
+                    controller: _goalController,
+                    decoration: const InputDecoration(
+                        labelText: 'Goal', border: OutlineInputBorder()),
+                    maxLines: 2,
+                    textInputAction: TextInputAction.done,
+                  ),
+                  if (widget.projectId != null) ...[
+                    const SizedBox(height: 12),
+                    DropdownButtonFormField<String>(
+                      initialValue: _status,
+                      decoration: const InputDecoration(
+                          labelText: 'Status',
+                          border: OutlineInputBorder()),
+                      items: const [
+                        DropdownMenuItem(
+                            value: 'active', child: Text('Active')),
+                        DropdownMenuItem(
+                            value: 'completed', child: Text('Completed')),
+                        DropdownMenuItem(
+                            value: 'archived', child: Text('Archived')),
+                      ],
+                      onChanged: (v) => setState(() => _status = v!),
+                    ),
+                  ],
+                ],
+              ),
+      ),
+    );
+  }
+}

lib/screens/projects/projects_screen.dart

@@ -0,0 +1,89 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../data/models/project.dart';
+import '../../providers/projects_provider.dart';
+
+class ProjectsScreen extends ConsumerWidget {
+  const ProjectsScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final projectsAsync = ref.watch(projectsProvider);
+    return Scaffold(
+      appBar: AppBar(title: const Text('Projects')),
+      body: projectsAsync.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (e, _) => Center(child: Text('Error: $e')),
+        data: (projects) => projects.isEmpty
+            ? const Center(child: Text('No projects yet.'))
+            : RefreshIndicator(
+                onRefresh: () async => ref.invalidate(projectsProvider),
+                child: ListView.separated(
+                  itemCount: projects.length,
+                  separatorBuilder: (_, _) => const Divider(height: 1),
+                  itemBuilder: (_, i) => _ProjectCard(project: projects[i]),
+                ),
+              ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () => context.push('/projects/new'),
+        tooltip: 'New project',
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+}
+
+class _ProjectCard extends StatelessWidget {
+  final Project project;
+  const _ProjectCard({required this.project});
+
+  Color _statusColor(BuildContext context) => switch (project.status) {
+        'completed' => Colors.blue,
+        'archived' => Colors.grey,
+        _ => Theme.of(context).colorScheme.primary,
+      };
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(project.title),
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          if (project.description?.isNotEmpty == true)
+            Text(
+              project.description!,
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+            ),
+          if (project.goal?.isNotEmpty == true)
+            Text(
+              project.goal!,
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+              style: Theme.of(context)
+                  .textTheme
+                  .bodySmall
+                  ?.copyWith(fontStyle: FontStyle.italic),
+            ),
+        ],
+      ),
+      trailing: Chip(
+        label: Text(
+          project.status,
+          style: TextStyle(
+            fontSize: 11,
+            color: _statusColor(context),
+          ),
+        ),
+        padding: EdgeInsets.zero,
+        visualDensity: VisualDensity.compact,
+        materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+      ),
+      onTap: () => context.push('/projects/${project.id}/tasks'),
+    );
+  }
+}