Add Projects feature; sync Note/Task models with backend additions

## New: Projects
- Project model, API, repository, Riverpod provider
- ProjectListScreen: active/archived sections, create dialog, long-press status/delete
- ProjectSelector widget: DropdownButtonFormField for note + task editors
- Projects tab added to shell (bottom nav + navigation rail, 4th position)
- /projects route registered in GoRouter ShellRoute

## Updated: Note model
- Added tags: List<String>, projectId: int?, milestoneId: int?
- NotesApi.create/update pass tags and project_id
- NotesRepository and NotesNotifier signatures updated
- NoteEditScreen: chip-based tag input + ProjectSelector

## Updated: Task model
- Added projectId: int?, milestoneId: int?, parentId: int?
- TasksApi.create passes project_id; update payload includes project_id
- TasksRepository and TasksNotifier signatures updated
- TaskEditScreen: ProjectSelector added; project_id sent on save

## Provider fix
- ProjectsNotifier.update renamed to updateProject to avoid conflict
  with AsyncNotifier.update(FutureOr<State> Function(State)) base method

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/app.dart

@@ -17,6 +17,7 @@ import 'screens/chat/conversations_list_screen.dart';
 import 'screens/notes/note_detail_screen.dart';
 import 'screens/notes/note_edit_screen.dart';
 import 'screens/notes/notes_list_screen.dart';
+import 'screens/projects/project_list_screen.dart';
 import 'screens/settings/settings_screen.dart';
 import 'screens/setup/setup_screen.dart';
 import 'screens/splash/splash_screen.dart';
@@ -118,6 +119,10 @@ final routerProvider = Provider<GoRouter>((ref) {
             path: Routes.tasks,
             builder: (_, _) => const TasksListScreen(),
           ),
+          GoRoute(
+            path: Routes.projects,
+            builder: (_, _) => const ProjectListScreen(),
+          ),
           GoRoute(
             path: Routes.conversations,
             builder: (_, _) => const ConversationsListScreen(),
@@ -137,7 +142,7 @@ class _Shell extends ConsumerStatefulWidget {
 }
 
 class _ShellState extends ConsumerState<_Shell> {
-  static const _tabs = [Routes.notes, Routes.tasks, Routes.conversations];
+  static const _tabs = [Routes.notes, Routes.tasks, Routes.projects, Routes.conversations];
 
   @override
   void initState() {
@@ -253,6 +258,11 @@ class _ShellState extends ConsumerState<_Shell> {
                           selectedIcon: Icon(Icons.check_box),
                           label: Text('Tasks'),
                         ),
+                        NavigationRailDestination(
+                          icon: Icon(Icons.folder_outlined),
+                          selectedIcon: Icon(Icons.folder),
+                          label: Text('Projects'),
+                        ),
                         NavigationRailDestination(
                           icon: Icon(Icons.chat_bubble_outline),
                           selectedIcon: Icon(Icons.chat_bubble),
@@ -284,6 +294,7 @@ class _ShellState extends ConsumerState<_Shell> {
         destinations: const [
           NavigationDestination(icon: Icon(Icons.note), label: 'Notes'),
           NavigationDestination(icon: Icon(Icons.check_box), label: 'Tasks'),
+          NavigationDestination(icon: Icon(Icons.folder), label: 'Projects'),
           NavigationDestination(
               icon: Icon(Icons.chat_bubble), label: 'Chat'),
         ],

lib/core/constants.dart

@@ -9,6 +9,7 @@ abstract class Routes {
   static const tasks = '/tasks';
   static const taskNew = '/tasks/new';
   static const taskEdit = '/tasks/:id/edit';
+  static const projects = '/projects';
   static const conversations = '/chat';
   static const chat = '/chat/:id';
   static const quickCapture = '/quick-capture';

lib/data/api/notes_api.dart

@@ -27,11 +27,18 @@ class NotesApi {
     }
   }
 
-  Future<Note> create(String title, String body) async {
+  Future<Note> create(
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+  }) async {
     try {
       final response = await _dio.post('/api/notes', data: {
         'title': title,
         'body': body,
+        'tags': tags,
+        if (projectId != null) 'project_id': projectId,
       });
       return Note.fromJson(response.data as Map<String, dynamic>);
     } on DioException catch (e) {
@@ -39,11 +46,20 @@ class NotesApi {
     }
   }
 
-  Future<Note> update(int id, String title, String body) async {
+  Future<Note> update(
+    int id,
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+    bool clearProject = false,
+  }) async {
     try {
       final response = await _dio.put('/api/notes/$id', data: {
         'title': title,
         'body': body,
+        'tags': tags,
+        if (clearProject) 'project_id': null else if (projectId != null) 'project_id': projectId,
       });
       return Note.fromJson(response.data as Map<String, dynamic>);
     } on DioException catch (e) {

lib/data/api/projects_api.dart

@@ -0,0 +1,71 @@
+import 'package:dio/dio.dart';
+
+import '../models/project.dart';
+import 'api_client.dart';
+
+class ProjectsApi {
+  final Dio _dio;
+  const ProjectsApi(this._dio);
+
+  Future<List<Project>> getAll({String? status}) async {
+    try {
+      final response = await _dio.get(
+        '/api/projects',
+        queryParameters: status != null ? {'status': status} : null,
+      );
+      final data = response.data as Map<String, dynamic>;
+      final list = data['projects'] as List<dynamic>;
+      return list
+          .map((e) => Project.fromJson(e as Map<String, dynamic>))
+          .toList();
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+
+  Future<Project> getOne(int id) async {
+    try {
+      final response = await _dio.get('/api/projects/$id');
+      return Project.fromJson(response.data as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+
+  Future<Project> create({
+    required String title,
+    String? description,
+    String? goal,
+    String? color,
+  }) async {
+    try {
+      final response = await _dio.post('/api/projects', data: {
+        'title': title,
+        if (description != null && description.isNotEmpty)
+          'description': description,
+        if (goal != null && goal.isNotEmpty) 'goal': goal,
+        if (color != null) 'color': color,
+      });
+      return Project.fromJson(response.data as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+
+  Future<Project> update(int id, Map<String, dynamic> fields) async {
+    try {
+      final response = await _dio.patch('/api/projects/$id', data: fields);
+      return Project.fromJson(response.data as Map<String, dynamic>);
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+
+  Future<void> delete(int id) async {
+    try {
+      await _dio.delete('/api/projects/$id');
+    } on DioException catch (e) {
+      throw dioToApp(e);
+    }
+  }
+}

lib/data/api/tasks_api.dart

@@ -33,6 +33,7 @@ class TasksApi {
     required TaskStatus status,
     required TaskPriority priority,
     DateTime? dueDate,
+    int? projectId,
   }) async {
     try {
       final response = await _dio.post('/api/tasks', data: {
@@ -41,6 +42,7 @@ class TasksApi {
         'status': status.value,
         'priority': priority.value,
         'due_date': dueDate?.toIso8601String(),
+        if (projectId != null) 'project_id': projectId,
       });
       return Task.fromJson(response.data as Map<String, dynamic>);
     } on DioException catch (e) {

lib/data/models/note.dart

@@ -2,6 +2,9 @@ class Note {
   final int id;
   final String title;
   final String body;
+  final List<String> tags;
+  final int? projectId;
+  final int? milestoneId;
   final DateTime createdAt;
   final DateTime updatedAt;
 
@@ -9,6 +12,9 @@ class Note {
     required this.id,
     required this.title,
     required this.body,
+    required this.tags,
+    this.projectId,
+    this.milestoneId,
     required this.createdAt,
     required this.updatedAt,
   });
@@ -17,6 +23,12 @@ class Note {
         id: json['id'] as int,
         title: json['title'] as String? ?? '',
         body: json['body'] as String? ?? '',
+        tags: (json['tags'] as List<dynamic>?)
+                ?.map((e) => e as String)
+                .toList() ??
+            [],
+        projectId: json['project_id'] as int?,
+        milestoneId: json['milestone_id'] as int?,
         createdAt: DateTime.parse(json['created_at'] as String),
         updatedAt: DateTime.parse(json['updated_at'] as String),
       );
@@ -24,13 +36,32 @@ class Note {
   Map<String, dynamic> toJson() => {
         'title': title,
         'body': body,
+        'tags': tags,
+        'project_id': projectId,
+        'milestone_id': milestoneId,
       };
 
-  Note copyWith({String? title, String? body}) => Note(
+  Note copyWith({
+    String? title,
+    String? body,
+    List<String>? tags,
+    Object? projectId = _undefined,
+    Object? milestoneId = _undefined,
+  }) =>
+      Note(
         id: id,
         title: title ?? this.title,
         body: body ?? this.body,
+        tags: tags ?? this.tags,
+        projectId: identical(projectId, _undefined)
+            ? this.projectId
+            : projectId as int?,
+        milestoneId: identical(milestoneId, _undefined)
+            ? this.milestoneId
+            : milestoneId as int?,
         createdAt: createdAt,
         updatedAt: updatedAt,
       );
+
+  static const _undefined = Object();
 }

lib/data/models/project.dart

@@ -0,0 +1,40 @@
+class Project {
+  final int id;
+  final String title;
+  final String? description;
+  final String? goal;
+  final String status; // active | completed | archived
+  final String? color;
+  final DateTime createdAt;
+  final DateTime updatedAt;
+
+  const Project({
+    required this.id,
+    required this.title,
+    this.description,
+    this.goal,
+    required this.status,
+    this.color,
+    required this.createdAt,
+    required this.updatedAt,
+  });
+
+  factory Project.fromJson(Map<String, dynamic> json) => Project(
+        id: json['id'] as int,
+        title: json['title'] as String? ?? '',
+        description: json['description'] as String?,
+        goal: json['goal'] as String?,
+        status: json['status'] as String? ?? 'active',
+        color: json['color'] as String?,
+        createdAt: DateTime.parse(json['created_at'] as String),
+        updatedAt: DateTime.parse(json['updated_at'] as String),
+      );
+
+  Map<String, dynamic> toJson() => {
+        'title': title,
+        'description': description,
+        'goal': goal,
+        'status': status,
+        'color': color,
+      };
+}

lib/data/models/task.dart

@@ -52,6 +52,9 @@ class Task {
   final TaskStatus status;
   final TaskPriority priority;
   final DateTime? dueDate;
+  final int? projectId;
+  final int? milestoneId;
+  final int? parentId;
   final DateTime createdAt;
   final DateTime updatedAt;
 
@@ -62,6 +65,9 @@ class Task {
     required this.status,
     required this.priority,
     this.dueDate,
+    this.projectId,
+    this.milestoneId,
+    this.parentId,
     required this.createdAt,
     required this.updatedAt,
   });
@@ -75,6 +81,9 @@ class Task {
         dueDate: json['due_date'] != null
             ? DateTime.parse(json['due_date'] as String)
             : null,
+        projectId: json['project_id'] as int?,
+        milestoneId: json['milestone_id'] as int?,
+        parentId: json['parent_id'] as int?,
         createdAt: DateTime.parse(json['created_at'] as String),
         updatedAt: DateTime.parse(json['updated_at'] as String),
       );
@@ -85,6 +94,9 @@ class Task {
         'status': status.value,
         'priority': priority.value,
         'due_date': dueDate?.toIso8601String(),
+        'project_id': projectId,
+        'milestone_id': milestoneId,
+        'parent_id': parentId,
       };
 
   Task copyWith({
@@ -93,6 +105,9 @@ class Task {
     TaskStatus? status,
     TaskPriority? priority,
     DateTime? dueDate,
+    Object? projectId = _undefined,
+    Object? milestoneId = _undefined,
+    Object? parentId = _undefined,
   }) =>
       Task(
         id: id,
@@ -101,7 +116,18 @@ class Task {
         status: status ?? this.status,
         priority: priority ?? this.priority,
         dueDate: dueDate ?? this.dueDate,
+        projectId: identical(projectId, _undefined)
+            ? this.projectId
+            : projectId as int?,
+        milestoneId: identical(milestoneId, _undefined)
+            ? this.milestoneId
+            : milestoneId as int?,
+        parentId: identical(parentId, _undefined)
+            ? this.parentId
+            : parentId as int?,
         createdAt: createdAt,
         updatedAt: updatedAt,
       );
+
+  static const _undefined = Object();
 }

lib/data/repositories/notes_repository.dart

@@ -7,9 +7,25 @@ class NotesRepository {
 
   Future<List<Note>> getAll() => _api.getAll();
   Future<Note> getOne(int id) => _api.getOne(id);
-  Future<Note> create(String title, String body) =>
-      _api.create(title, body);
-  Future<Note> update(int id, String title, String body) =>
-      _api.update(id, title, body);
+
+  Future<Note> create(
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+  }) =>
+      _api.create(title, body, tags: tags, projectId: projectId);
+
+  Future<Note> update(
+    int id,
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+    bool clearProject = false,
+  }) =>
+      _api.update(id, title, body,
+          tags: tags, projectId: projectId, clearProject: clearProject);
+
   Future<void> delete(int id) => _api.delete(id);
 }

lib/data/repositories/projects_repository.dart

@@ -0,0 +1,21 @@
+import '../api/projects_api.dart';
+import '../models/project.dart';
+
+class ProjectsRepository {
+  final ProjectsApi _api;
+  const ProjectsRepository(this._api);
+
+  Future<List<Project>> getAll({String? status}) => _api.getAll(status: status);
+  Future<Project> getOne(int id) => _api.getOne(id);
+  Future<Project> create({
+    required String title,
+    String? description,
+    String? goal,
+    String? color,
+  }) =>
+      _api.create(
+          title: title, description: description, goal: goal, color: color);
+  Future<Project> update(int id, Map<String, dynamic> fields) =>
+      _api.update(id, fields);
+  Future<void> delete(int id) => _api.delete(id);
+}

lib/data/repositories/tasks_repository.dart

@@ -14,6 +14,7 @@ class TasksRepository {
     required TaskStatus status,
     required TaskPriority priority,
     DateTime? dueDate,
+    int? projectId,
   }) =>
       _api.create(
         title: title,
@@ -21,6 +22,7 @@ class TasksRepository {
         status: status,
         priority: priority,
         dueDate: dueDate,
+        projectId: projectId,
       );
 
   Future<Task> update(int id, Map<String, dynamic> fields) =>

lib/providers/api_client_provider.dart

@@ -6,11 +6,13 @@ import '../data/api/api_client.dart';
 import '../data/api/auth_api.dart';
 import '../data/api/chat_api.dart';
 import '../data/api/notes_api.dart';
+import '../data/api/projects_api.dart';
 import '../data/api/quick_capture_api.dart';
 import '../data/api/tasks_api.dart';
 import '../data/repositories/auth_repository.dart';
 import '../data/repositories/chat_repository.dart';
 import '../data/repositories/notes_repository.dart';
+import '../data/repositories/projects_repository.dart';
 import '../data/repositories/tasks_repository.dart';
 import 'settings_provider.dart';
 
@@ -45,6 +47,10 @@ final quickCaptureApiProvider = Provider<QuickCaptureApi>((ref) {
   return QuickCaptureApi(ref.watch(dioProvider));
 });
 
+final projectsApiProvider = Provider<ProjectsApi>((ref) {
+  return ProjectsApi(ref.watch(dioProvider));
+});
+
 final authRepositoryProvider = Provider<AuthRepository>((ref) {
   return AuthRepository(ref.watch(authApiProvider));
 });
@@ -60,3 +66,7 @@ final tasksRepositoryProvider = Provider<TasksRepository>((ref) {
 final chatRepositoryProvider = Provider<ChatRepository>((ref) {
   return ChatRepository(ref.watch(chatApiProvider));
 });
+
+final projectsRepositoryProvider = Provider<ProjectsRepository>((ref) {
+  return ProjectsRepository(ref.watch(projectsApiProvider));
+});

lib/providers/notes_provider.dart

@@ -12,16 +12,35 @@ class NotesNotifier extends AsyncNotifier<List<Note>> {
     return ref.watch(notesRepositoryProvider).getAll();
   }
 
-  Future<Note> create(String title, String body) async {
-    final note =
-        await ref.read(notesRepositoryProvider).create(title, body);
+  Future<Note> create(
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+  }) async {
+    final note = await ref
+        .read(notesRepositoryProvider)
+        .create(title, body, tags: tags, projectId: projectId);
     state = AsyncData([...state.valueOrNull ?? [], note]);
     return note;
   }
 
-  Future<Note> updateNote(int id, String title, String body) async {
-    final updated =
-        await ref.read(notesRepositoryProvider).update(id, title, body);
+  Future<Note> updateNote(
+    int id,
+    String title,
+    String body, {
+    List<String> tags = const [],
+    int? projectId,
+    bool clearProject = false,
+  }) async {
+    final updated = await ref.read(notesRepositoryProvider).update(
+          id,
+          title,
+          body,
+          tags: tags,
+          projectId: projectId,
+          clearProject: clearProject,
+        );
     state = AsyncData([
       for (final n in state.valueOrNull ?? [])
         if (n.id == id) updated else n,

lib/providers/projects_provider.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../data/models/project.dart';
+import 'api_client_provider.dart';
+
+final projectsProvider =
+    AsyncNotifierProvider<ProjectsNotifier, List<Project>>(
+        ProjectsNotifier.new);
+
+class ProjectsNotifier extends AsyncNotifier<List<Project>> {
+  @override
+  Future<List<Project>> build() async {
+    return ref.watch(projectsRepositoryProvider).getAll();
+  }
+
+  Future<Project> create({
+    required String title,
+    String? description,
+    String? goal,
+    String? color,
+  }) async {
+    final project = await ref.read(projectsRepositoryProvider).create(
+          title: title,
+          description: description,
+          goal: goal,
+          color: color,
+        );
+    state = AsyncData([...state.valueOrNull ?? [], project]);
+    return project;
+  }
+
+  Future<Project> updateProject(int id, Map<String, dynamic> fields) async {
+    final updated =
+        await ref.read(projectsRepositoryProvider).update(id, fields);
+    state = AsyncData([
+      for (final p in state.valueOrNull ?? [])
+        if (p.id == id) updated else p,
+    ]);
+    return updated;
+  }
+
+  Future<void> delete(int id) async {
+    await ref.read(projectsRepositoryProvider).delete(id);
+    state = AsyncData([
+      for (final p in state.valueOrNull ?? [])
+        if (p.id != id) p,
+    ]);
+  }
+}

lib/providers/tasks_provider.dart

@@ -18,6 +18,7 @@ class TasksNotifier extends AsyncNotifier<List<Task>> {
     required TaskStatus status,
     required TaskPriority priority,
     DateTime? dueDate,
+    int? projectId,
   }) async {
     final task = await ref.read(tasksRepositoryProvider).create(
           title: title,
@@ -25,6 +26,7 @@ class TasksNotifier extends AsyncNotifier<List<Task>> {
           status: status,
           priority: priority,
           dueDate: dueDate,
+          projectId: projectId,
         );
     state = AsyncData([...state.valueOrNull ?? [], task]);
     return task;

lib/screens/notes/note_edit_screen.dart

@@ -7,6 +7,7 @@ import '../../core/exceptions.dart';
 import '../../core/wikilink_syntax.dart';
 import '../../providers/api_client_provider.dart';
 import '../../providers/notes_provider.dart';
+import '../../widgets/project_selector.dart';
 
 class NoteEditScreen extends ConsumerStatefulWidget {
   final int? noteId;
@@ -19,10 +20,12 @@ class NoteEditScreen extends ConsumerStatefulWidget {
 class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
   final _titleController = TextEditingController();
   final _contentController = TextEditingController();
+  final _tagController = TextEditingController();
+  List<String> _tags = [];
+  int? _projectId;
   bool _preview = false;
   bool _saving = false;
 
-  // Future is created once in initState so FutureBuilder never restarts it.
   late final Future<void> _initFuture;
 
   @override
@@ -36,6 +39,7 @@ class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
   void dispose() {
     _titleController.dispose();
     _contentController.dispose();
+    _tagController.dispose();
     super.dispose();
   }
 
@@ -44,6 +48,24 @@ class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
         await ref.read(notesRepositoryProvider).getOne(widget.noteId!);
     _titleController.text = note.title;
     _contentController.text = note.body;
+    _tags = List<String>.from(note.tags);
+    _projectId = note.projectId;
+  }
+
+  void _addTag(String raw) {
+    final tag = raw.trim().replaceAll(',', '').toLowerCase();
+    if (tag.isEmpty || _tags.contains(tag)) {
+      _tagController.clear();
+      return;
+    }
+    setState(() {
+      _tags = [..._tags, tag];
+      _tagController.clear();
+    });
+  }
+
+  void _removeTag(String tag) {
+    setState(() => _tags = _tags.where((t) => t != tag).toList());
   }
 
   Future<void> _delete() async {
@@ -81,12 +103,22 @@ class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
     setState(() => _saving = true);
     try {
       if (widget.noteId == null) {
-        await ref.read(notesProvider.notifier).create(title, body);
+        await ref.read(notesProvider.notifier).create(
+              title,
+              body,
+              tags: _tags,
+              projectId: _projectId,
+            );
         if (mounted) context.pop();
       } else {
-        await ref
-            .read(notesProvider.notifier)
-            .updateNote(widget.noteId!, title, body);
+        await ref.read(notesProvider.notifier).updateNote(
+              widget.noteId!,
+              title,
+              body,
+              tags: _tags,
+              projectId: _projectId,
+              clearProject: _projectId == null,
+            );
         if (mounted) context.pop();
       }
     } on AppException catch (e) {
@@ -147,7 +179,23 @@ class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
                         textInputAction: TextInputAction.next,
                       ),
                     ),
-                    const Divider(),
+                    Padding(
+                      padding: const EdgeInsets.fromLTRB(16, 0, 16, 8),
+                      child: _TagInput(
+                        tags: _tags,
+                        controller: _tagController,
+                        onAdd: _addTag,
+                        onRemove: _removeTag,
+                      ),
+                    ),
+                    Padding(
+                      padding: const EdgeInsets.fromLTRB(16, 0, 16, 8),
+                      child: ProjectSelector(
+                        value: _projectId,
+                        onChanged: (id) => setState(() => _projectId = id),
+                      ),
+                    ),
+                    const Divider(height: 1),
                     Expanded(
                       child: _preview
                           ? Markdown(
@@ -177,3 +225,57 @@ class _NoteEditScreenState extends ConsumerState<NoteEditScreen> {
     );
   }
 }
+
+class _TagInput extends StatelessWidget {
+  final List<String> tags;
+  final TextEditingController controller;
+  final ValueChanged<String> onAdd;
+  final ValueChanged<String> onRemove;
+
+  const _TagInput({
+    required this.tags,
+    required this.controller,
+    required this.onAdd,
+    required this.onRemove,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Wrap(
+      spacing: 6,
+      runSpacing: 4,
+      crossAxisAlignment: WrapCrossAlignment.center,
+      children: [
+        ...tags.map(
+          (tag) => Chip(
+            label: Text('#$tag', style: const TextStyle(fontSize: 12)),
+            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+            padding: const EdgeInsets.symmetric(horizontal: 4),
+            deleteIcon: const Icon(Icons.close, size: 14),
+            onDeleted: () => onRemove(tag),
+          ),
+        ),
+        SizedBox(
+          width: 120,
+          child: TextField(
+            controller: controller,
+            decoration: const InputDecoration(
+              hintText: 'Add tag…',
+              border: InputBorder.none,
+              isDense: true,
+              contentPadding: EdgeInsets.symmetric(vertical: 4),
+            ),
+            style: const TextStyle(fontSize: 13),
+            textInputAction: TextInputAction.done,
+            onSubmitted: onAdd,
+            onChanged: (v) {
+              if (v.endsWith(',') || v.endsWith(' ')) {
+                onAdd(v.replaceAll(RegExp(r'[, ]+$'), ''));
+              }
+            },
+          ),
+        ),
+      ],
+    );
+  }
+}

lib/screens/projects/project_list_screen.dart

@@ -0,0 +1,316 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../core/exceptions.dart';
+import '../../data/models/project.dart';
+import '../../providers/projects_provider.dart';
+
+class ProjectListScreen extends ConsumerWidget {
+  const ProjectListScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final projectsAsync = ref.watch(projectsProvider);
+
+    return Scaffold(
+      appBar: AppBar(title: const Text('Projects')),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () => _showCreateDialog(context, ref),
+        tooltip: 'New project',
+        child: const Icon(Icons.add),
+      ),
+      body: projectsAsync.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (e, _) => Center(child: Text('Error: $e')),
+        data: (projects) {
+          if (projects.isEmpty) {
+            return const Center(
+              child: Text(
+                'No projects yet.\nTap + to create one.',
+                textAlign: TextAlign.center,
+              ),
+            );
+          }
+          final active =
+              projects.where((p) => p.status == 'active').toList();
+          final other =
+              projects.where((p) => p.status != 'active').toList();
+          return ListView(
+            padding: const EdgeInsets.symmetric(vertical: 8),
+            children: [
+              if (active.isNotEmpty) ...[
+                _SectionHeader(title: 'Active (${active.length})'),
+                ...active.map((p) => _ProjectTile(project: p)),
+              ],
+              if (other.isNotEmpty) ...[
+                _SectionHeader(title: 'Other'),
+                ...other.map((p) => _ProjectTile(project: p)),
+              ],
+            ],
+          );
+        },
+      ),
+    );
+  }
+
+  void _showCreateDialog(BuildContext context, WidgetRef ref) {
+    showDialog<void>(
+      context: context,
+      builder: (dialogContext) => _CreateProjectDialog(
+        onCreate: (title, description, goal) async {
+          try {
+            await ref
+                .read(projectsProvider.notifier)
+                .create(title: title, description: description, goal: goal);
+          } on AppException catch (e) {
+            if (context.mounted) {
+              ScaffoldMessenger.of(context).showSnackBar(
+                SnackBar(content: Text(e.message)),
+              );
+            }
+          }
+        },
+      ),
+    );
+  }
+}
+
+class _SectionHeader extends StatelessWidget {
+  final String title;
+  const _SectionHeader({required this.title});
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(16, 16, 16, 4),
+      child: Text(
+        title,
+        style: Theme.of(context)
+            .textTheme
+            .labelMedium
+            ?.copyWith(color: Theme.of(context).colorScheme.primary),
+      ),
+    );
+  }
+}
+
+class _ProjectTile extends ConsumerWidget {
+  final Project project;
+  const _ProjectTile({required this.project});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final statusColor = switch (project.status) {
+      'completed' => Colors.green,
+      'archived' => Colors.grey,
+      _ => Theme.of(context).colorScheme.primary,
+    };
+
+    return ListTile(
+      leading: CircleAvatar(
+        backgroundColor: statusColor.withValues(alpha: 0.15),
+        child: Icon(Icons.folder_outlined, color: statusColor, size: 20),
+      ),
+      title: Text(project.title),
+      subtitle: project.description != null && project.description!.isNotEmpty
+          ? Text(
+              project.description!,
+              maxLines: 1,
+              overflow: TextOverflow.ellipsis,
+            )
+          : null,
+      trailing: _StatusChip(status: project.status),
+      onLongPress: () => _showOptions(context, ref),
+    );
+  }
+
+  void _showOptions(BuildContext context, WidgetRef ref) {
+    showModalBottomSheet<void>(
+      context: context,
+      builder: (_) => SafeArea(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            ListTile(
+              leading: const Icon(Icons.check_circle_outline),
+              title: const Text('Mark completed'),
+              onTap: () async {
+                Navigator.pop(context);
+                await ref.read(projectsProvider.notifier).updateProject(
+                  project.id,
+                  {'status': 'completed'},
+                );
+              },
+            ),
+            ListTile(
+              leading: const Icon(Icons.archive_outlined),
+              title: const Text('Archive'),
+              onTap: () async {
+                Navigator.pop(context);
+                await ref.read(projectsProvider.notifier).updateProject(
+                  project.id,
+                  {'status': 'archived'},
+                );
+              },
+            ),
+            ListTile(
+              leading: Icon(Icons.delete_outline,
+                  color: Theme.of(context).colorScheme.error),
+              title: Text('Delete',
+                  style: TextStyle(
+                      color: Theme.of(context).colorScheme.error)),
+              onTap: () async {
+                Navigator.pop(context);
+                final confirm = await showDialog<bool>(
+                  context: context,
+                  builder: (dialogContext) => AlertDialog(
+                    title: const Text('Delete project?'),
+                    content: Text(
+                        'Notes and tasks will be unlinked, not deleted.'),
+                    actions: [
+                      TextButton(
+                        onPressed: () =>
+                            Navigator.pop(dialogContext, false),
+                        child: const Text('Cancel'),
+                      ),
+                      TextButton(
+                        onPressed: () =>
+                            Navigator.pop(dialogContext, true),
+                        child: const Text('Delete'),
+                      ),
+                    ],
+                  ),
+                );
+                if (confirm == true && context.mounted) {
+                  await ref
+                      .read(projectsProvider.notifier)
+                      .delete(project.id);
+                }
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _StatusChip extends StatelessWidget {
+  final String status;
+  const _StatusChip({required this.status});
+
+  @override
+  Widget build(BuildContext context) {
+    final (label, color) = switch (status) {
+      'completed' => ('Done', Colors.green),
+      'archived' => ('Archived', Colors.grey),
+      _ => ('Active', Theme.of(context).colorScheme.primary),
+    };
+    return Chip(
+      label: Text(label, style: const TextStyle(fontSize: 11)),
+      padding: EdgeInsets.zero,
+      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+      side: BorderSide(color: color.withValues(alpha: 0.4)),
+      backgroundColor: color.withValues(alpha: 0.1),
+      labelStyle: TextStyle(color: color),
+    );
+  }
+}
+
+class _CreateProjectDialog extends StatefulWidget {
+  final Future<void> Function(String title, String? description, String? goal)
+      onCreate;
+
+  const _CreateProjectDialog({required this.onCreate});
+
+  @override
+  State<_CreateProjectDialog> createState() => _CreateProjectDialogState();
+}
+
+class _CreateProjectDialogState extends State<_CreateProjectDialog> {
+  final _titleController = TextEditingController();
+  final _descController = TextEditingController();
+  final _goalController = TextEditingController();
+  bool _saving = false;
+
+  @override
+  void dispose() {
+    _titleController.dispose();
+    _descController.dispose();
+    _goalController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _submit() async {
+    final title = _titleController.text.trim();
+    if (title.isEmpty) return;
+    setState(() => _saving = true);
+    try {
+      await widget.onCreate(
+        title,
+        _descController.text.trim().isEmpty ? null : _descController.text.trim(),
+        _goalController.text.trim().isEmpty ? null : _goalController.text.trim(),
+      );
+      if (mounted) Navigator.pop(context);
+    } finally {
+      if (mounted) setState(() => _saving = false);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: const Text('New Project'),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          TextField(
+            controller: _titleController,
+            decoration: const InputDecoration(
+              labelText: 'Title',
+              border: OutlineInputBorder(),
+            ),
+            autofocus: true,
+            textInputAction: TextInputAction.next,
+          ),
+          const SizedBox(height: 12),
+          TextField(
+            controller: _descController,
+            decoration: const InputDecoration(
+              labelText: 'Description (optional)',
+              border: OutlineInputBorder(),
+            ),
+            maxLines: 2,
+            textInputAction: TextInputAction.next,
+          ),
+          const SizedBox(height: 12),
+          TextField(
+            controller: _goalController,
+            decoration: const InputDecoration(
+              labelText: 'Goal (optional)',
+              border: OutlineInputBorder(),
+            ),
+            textInputAction: TextInputAction.done,
+            onSubmitted: (_) => _submit(),
+          ),
+        ],
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context),
+          child: const Text('Cancel'),
+        ),
+        FilledButton(
+          onPressed: _saving ? null : _submit,
+          child: _saving
+              ? const SizedBox(
+                  width: 16,
+                  height: 16,
+                  child: CircularProgressIndicator(strokeWidth: 2),
+                )
+              : const Text('Create'),
+        ),
+      ],
+    );
+  }
+}

lib/screens/tasks/task_edit_screen.dart

@@ -6,6 +6,7 @@ import '../../core/exceptions.dart';
 import '../../data/models/task.dart';
 import '../../providers/api_client_provider.dart';
 import '../../providers/tasks_provider.dart';
+import '../../widgets/project_selector.dart';
 
 class TaskEditScreen extends ConsumerStatefulWidget {
   final int? taskId;
@@ -22,6 +23,7 @@ class _TaskEditScreenState extends ConsumerState<TaskEditScreen> {
   TaskStatus _status = TaskStatus.todo;
   TaskPriority _priority = TaskPriority.medium;
   DateTime? _dueDate;
+  int? _projectId;
   bool _saving = false;
 
   // Future is created once in initState so FutureBuilder never restarts it.
@@ -49,6 +51,7 @@ class _TaskEditScreenState extends ConsumerState<TaskEditScreen> {
     _status = task.status;
     _priority = task.priority;
     _dueDate = task.dueDate;
+    _projectId = task.projectId;
   }
 
   Future<void> _save() async {
@@ -64,16 +67,18 @@ class _TaskEditScreenState extends ConsumerState<TaskEditScreen> {
               status: _status,
               priority: _priority,
               dueDate: _dueDate,
+              projectId: _projectId,
             );
       } else {
         await ref.read(tasksProvider.notifier).updateTask(widget.taskId!, {
           'title': _titleController.text.trim(),
-          'description': _descController.text.trim().isEmpty
+          'body': _descController.text.trim().isEmpty
               ? null
               : _descController.text.trim(),
           'status': _status.value,
           'priority': _priority.value,
           'due_date': _dueDate?.toIso8601String(),
+          'project_id': _projectId,
         });
       }
       if (mounted) context.pop();
@@ -216,6 +221,11 @@ class _TaskEditScreenState extends ConsumerState<TaskEditScreen> {
                             : null,
                         onTap: _pickDate,
                       ),
+                      const SizedBox(height: 16),
+                      ProjectSelector(
+                        value: _projectId,
+                        onChanged: (id) => setState(() => _projectId = id),
+                      ),
                     ],
                   ),
                 ),

lib/widgets/project_selector.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../providers/projects_provider.dart';
+
+/// Dropdown for picking a project. Pass [value] as the current project id
+/// (null = no project) and [onChanged] to receive updates.
+class ProjectSelector extends ConsumerWidget {
+  final int? value;
+  final ValueChanged<int?> onChanged;
+  final InputDecoration? decoration;
+
+  const ProjectSelector({
+    super.key,
+    required this.value,
+    required this.onChanged,
+    this.decoration,
+  });
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final projectsAsync = ref.watch(projectsProvider);
+
+    return projectsAsync.when(
+      loading: () => const LinearProgressIndicator(),
+      error: (_, __) => const SizedBox.shrink(),
+      data: (projects) {
+        final active =
+            projects.where((p) => p.status == 'active').toList();
+
+        return DropdownButtonFormField<int?>(
+          value: value,
+          decoration: decoration ??
+              const InputDecoration(
+                labelText: 'Project (optional)',
+                border: OutlineInputBorder(),
+              ),
+          items: [
+            const DropdownMenuItem<int?>(
+              value: null,
+              child: Text('No project'),
+            ),
+            ...active.map(
+              (p) => DropdownMenuItem<int?>(
+                value: p.id,
+                child: Text(p.title, overflow: TextOverflow.ellipsis),
+              ),
+            ),
+          ],
+          onChanged: onChanged,
+        );
+      },
+    );
+  }
+}