UX-25: Notification type differentiation, grouping, and batch actions

backend/src/Taskdeck.Api/Controllers/NotificationsController.cs

@@ -49,6 +49,18 @@ public async Task<IActionResult> MarkAsRead(Guid id, CancellationToken cancellat
         return result.IsSuccess ? Ok(result.Value) : result.ToErrorActionResult();
     }
 
+    [HttpPost("mark-all-read")]
+    public async Task<IActionResult> MarkAllAsRead(
+        [FromQuery] Guid? boardId = null,
+        CancellationToken cancellationToken = default)
+    {
+        if (!TryGetCurrentUserId(out var userId, out var errorResult))
+            return errorResult!;
+
+        var result = await _notificationService.MarkAllAsReadAsync(userId, boardId, cancellationToken);
+        return result.IsSuccess ? Ok(new { markedCount = result.Value }) : result.ToErrorActionResult();
+    }
+
     [HttpGet("preferences")]
     public async Task<IActionResult> GetPreferences(CancellationToken cancellationToken = default)
     {

backend/src/Taskdeck.Application/Interfaces/INotificationRepository.cs

@@ -16,4 +16,9 @@ Task<IEnumerable<Notification>> GetByUserIdAsync(
         Guid userId,
         string deduplicationKey,
         CancellationToken cancellationToken = default);
+
+    Task<IEnumerable<Notification>> GetUnreadByUserIdAsync(
+        Guid userId,
+        Guid? boardId = null,
+        CancellationToken cancellationToken = default);
 }

backend/src/Taskdeck.Application/Services/INotificationService.cs

@@ -15,6 +15,11 @@ Task<Result<NotificationDto>> MarkAsReadAsync(
         Guid notificationId,
         CancellationToken cancellationToken = default);
 
+    Task<Result<int>> MarkAllAsReadAsync(
+        Guid userId,
+        Guid? boardId = null,
+        CancellationToken cancellationToken = default);
+
     Task<Result<NotificationPreferenceDto>> GetPreferencesAsync(
         Guid userId,
         CancellationToken cancellationToken = default);

backend/src/Taskdeck.Application/Services/NoOpNotificationService.cs

@@ -28,6 +28,14 @@ public Task<Result<NotificationDto>> MarkAsReadAsync(
         return Task.FromResult(Result.Failure<NotificationDto>(ErrorCodes.NotFound, "Notification not found"));
     }
 
+    public Task<Result<int>> MarkAllAsReadAsync(
+        Guid userId,
+        Guid? boardId = null,
+        CancellationToken cancellationToken = default)
+    {
+        return Task.FromResult(Result.Success(0));
+    }
+
     public Task<Result<NotificationPreferenceDto>> GetPreferencesAsync(
         Guid userId,
         CancellationToken cancellationToken = default)

backend/src/Taskdeck.Application/Services/NotificationService.cs

@@ -84,6 +84,43 @@ public async Task<Result<NotificationDto>> MarkAsReadAsync(
         return Result.Success(MapToDto(notification));
     }
 
+    public async Task<Result<int>> MarkAllAsReadAsync(
+        Guid userId,
+        Guid? boardId = null,
+        CancellationToken cancellationToken = default)
+    {
+        if (userId == Guid.Empty)
+            return Result.Failure<int>(ErrorCodes.ValidationError, "User ID cannot be empty");
+
+        if (boardId.HasValue && _authorizationService is not null)
+        {
+            var boardPermission = await _authorizationService.CanReadBoardAsync(userId, boardId.Value);
+            if (!boardPermission.IsSuccess || !boardPermission.Value)
+            {
+                return Result.Failure<int>(
+                    ErrorCodes.Forbidden,
+                    "You do not have access to notifications for this board");
+            }
+        }
+
+        var unreadNotifications = await _unitOfWork.Notifications.GetUnreadByUserIdAsync(
+            userId, boardId, cancellationToken);
+
+        var count = 0;
+        foreach (var notification in unreadNotifications)
+        {
+            notification.MarkAsRead();
+            count++;
+        }
+
+        if (count > 0)
+        {
+            await _unitOfWork.SaveChangesAsync(cancellationToken);
+        }
+
+        return Result.Success(count);
+    }
+
     public async Task<Result<NotificationPreferenceDto>> GetPreferencesAsync(
         Guid userId,
         CancellationToken cancellationToken = default)
@@ -218,6 +255,8 @@ private static bool TryResolveCadence(
             NotificationType.Mention => preference.MentionImmediateEnabled,
             NotificationType.Assignment => preference.AssignmentImmediateEnabled,
             NotificationType.ProposalOutcome => preference.ProposalOutcomeImmediateEnabled,
+            NotificationType.BoardChange => true,
+            NotificationType.System => true,
             _ => false
         };
 
@@ -226,6 +265,8 @@ private static bool TryResolveCadence(
             NotificationType.Mention => preference.MentionDigestEnabled,
             NotificationType.Assignment => preference.AssignmentDigestEnabled,
             NotificationType.ProposalOutcome => preference.ProposalOutcomeDigestEnabled,
+            NotificationType.BoardChange => false,
+            NotificationType.System => false,
             _ => false
         };
 

backend/src/Taskdeck.Domain/Entities/Notification.cs

@@ -94,7 +94,9 @@ public enum NotificationType
 {
     Mention,
     Assignment,
-    ProposalOutcome
+    ProposalOutcome,
+    BoardChange,
+    System
 }
 
 public enum NotificationCadence

backend/src/Taskdeck.Infrastructure/Repositories/NotificationRepository.cs

@@ -49,4 +49,20 @@ public async Task<IEnumerable<Notification>> GetByUserIdAsync(
             n => n.UserId == userId && n.DeduplicationKey == deduplicationKey,
             cancellationToken);
     }
+
+    public async Task<IEnumerable<Notification>> GetUnreadByUserIdAsync(
+        Guid userId,
+        Guid? boardId = null,
+        CancellationToken cancellationToken = default)
+    {
+        var query = _dbSet
+            .Where(n => n.UserId == userId && !n.IsRead);
+
+        if (boardId.HasValue)
+        {
+            query = query.Where(n => n.BoardId == boardId.Value);
+        }
+
+        return await query.ToListAsync(cancellationToken);
+    }
 }

backend/tests/Taskdeck.Application.Tests/Services/NotificationServiceTests.cs

@@ -164,6 +164,66 @@ public async Task GetNotificationsAsync_ShouldReturnForbidden_WhenBoardLookupFai
         result.ErrorMessage.Should().Be("You do not have access to notifications for this board");
     }
 
+    [Fact]
+    public async Task MarkAllAsReadAsync_ShouldMarkAllUnread_WhenNotificationsExist()
+    {
+        var userId = Guid.NewGuid();
+        var n1 = new Notification(userId, NotificationType.Mention, NotificationCadence.Immediate, "N1", "Message 1");
+        var n2 = new Notification(userId, NotificationType.Assignment, NotificationCadence.Immediate, "N2", "Message 2");
+
+        _notificationRepositoryMock
+            .Setup(r => r.GetUnreadByUserIdAsync(userId, null, default))
+            .ReturnsAsync(new[] { n1, n2 });
+
+        var result = await _service.MarkAllAsReadAsync(userId);
+
+        result.IsSuccess.Should().BeTrue();
+        result.Value.Should().Be(2);
+        n1.IsRead.Should().BeTrue();
+        n2.IsRead.Should().BeTrue();
+        _unitOfWorkMock.Verify(u => u.SaveChangesAsync(default), Times.Once);
+    }
+
+    [Fact]
+    public async Task MarkAllAsReadAsync_ShouldReturnZero_WhenNoUnreadNotifications()
+    {
+        var userId = Guid.NewGuid();
+        _notificationRepositoryMock
+            .Setup(r => r.GetUnreadByUserIdAsync(userId, null, default))
+            .ReturnsAsync(Array.Empty<Notification>());
+
+        var result = await _service.MarkAllAsReadAsync(userId);
+
+        result.IsSuccess.Should().BeTrue();
+        result.Value.Should().Be(0);
+        _unitOfWorkMock.Verify(u => u.SaveChangesAsync(default), Times.Never);
+    }
+
+    [Fact]
+    public async Task MarkAllAsReadAsync_ShouldReturnForbidden_WhenBoardAccessDenied()
+    {
+        var userId = Guid.NewGuid();
+        var boardId = Guid.NewGuid();
+
+        _authorizationServiceMock
+            .Setup(s => s.CanReadBoardAsync(userId, boardId))
+            .ReturnsAsync(Result.Success(false));
+
+        var result = await _service.MarkAllAsReadAsync(userId, boardId);
+
+        result.IsSuccess.Should().BeFalse();
+        result.ErrorCode.Should().Be(ErrorCodes.Forbidden);
+    }
+
+    [Fact]
+    public async Task MarkAllAsReadAsync_ShouldReturnValidationError_WhenUserIdEmpty()
+    {
+        var result = await _service.MarkAllAsReadAsync(Guid.Empty);
+
+        result.IsSuccess.Should().BeFalse();
+        result.ErrorCode.Should().Be(ErrorCodes.ValidationError);
+    }
+
     [Fact]
     public async Task PublishAsync_ShouldAvoidDuplicatesWithinSameUnitOfWork_WhenPreferenceIsNotPersistedYet()
     {

frontend/taskdeck-web/src/api/notificationsApi.ts

@@ -1,6 +1,7 @@
 import http from './http'
 import { buildQueryString } from '../utils/queryBuilder'
 import type {
+  MarkAllReadResponse,
   NotificationItem,
   NotificationPreference,
   NotificationQuery,
@@ -18,6 +19,12 @@ export const notificationsApi = {
     return data
   },
 
+  async markAllRead(boardId?: string): Promise<MarkAllReadResponse> {
+    const qs = boardId ? `?boardId=${encodeURIComponent(boardId)}` : ''
+    const { data } = await http.post<MarkAllReadResponse>(`/notifications/mark-all-read${qs}`)
+    return data
+  },
+
   async getPreferences(): Promise<NotificationPreference> {
     const { data } = await http.get<NotificationPreference>('/notifications/preferences')
     return data