feat(board): show upcoming deadline tasks

TaskTracker.Api/Pages/Board.cshtml.cs

@@ -19,6 +19,7 @@ public class BoardModel : PageModel
     }
 
     public List<ColumnViewModel> Columns { get; set; } = new();
+    public List<WorkTask> UpcomingTasks { get; private set; } = new();
     public string? ActiveCategory { get; set; }
     public bool HasSubtasksFilter { get; set; }
     public List<string> AllCategories { get; set; } = new();
@@ -277,6 +278,43 @@ public class BoardModel : PageModel
         return Partial("Partials/_SearchResults", results);
     }
 
+    public static List<WorkTask> SelectUpcomingTasks(
+        IEnumerable<WorkTask> allTasks,
+        string? category,
+        bool hasSubtasks) =>
+        SelectUpcomingTasks(FilterVisibleTasks(allTasks, category, hasSubtasks));
+
+    private static IEnumerable<WorkTask> FilterVisibleTasks(
+        IEnumerable<WorkTask> allTasks,
+        string? category,
+        bool hasSubtasks)
+    {
+        var visibleTasks = allTasks;
+
+        if (!string.IsNullOrEmpty(category))
+        {
+            visibleTasks = visibleTasks.Where(task =>
+                string.Equals(task.Category, category, StringComparison.OrdinalIgnoreCase));
+        }
+
+        if (hasSubtasks)
+        {
+            visibleTasks = visibleTasks.Where(task => task.SubTasks.Count > 0);
+        }
+
+        return visibleTasks;
+    }
+
+    private static List<WorkTask> SelectUpcomingTasks(IEnumerable<WorkTask> visibleTasks)
+    {
+        return visibleTasks
+            .Where(task => task.DueAt.HasValue &&
+                           task.Status is not WorkTaskStatus.Completed and not WorkTaskStatus.Abandoned)
+            .OrderBy(task => task.DueAt)
+            .Take(8)
+            .ToList();
+    }
+
     private async Task<IActionResult> ReturnBoardContentAsync()
     {
         await LoadBoardDataAsync();
@@ -296,21 +334,11 @@ public class BoardModel : PageModel
             .OrderBy(c => c)
             .ToList();
 
-        // Filter to top-level only
-        var tasks = allTasks.Where(t => t.ParentTaskId == null).ToList();
+        var visibleTasks = FilterVisibleTasks(allTasks, ActiveCategory, HasSubtasksFilter).ToList();
+        UpcomingTasks = SelectUpcomingTasks(visibleTasks);
 
-        // Apply category filter
-        if (!string.IsNullOrEmpty(ActiveCategory))
-        {
-            tasks = tasks.Where(t =>
-                string.Equals(t.Category, ActiveCategory, StringComparison.OrdinalIgnoreCase)).ToList();
-        }
-
-        // Apply hasSubtasks filter
-        if (HasSubtasksFilter)
-        {
-            tasks = tasks.Where(t => t.SubTasks.Count > 0).ToList();
-        }
+        // Keep the Kanban collection top-level only after filters apply across all tasks.
+        var tasks = visibleTasks.Where(task => task.ParentTaskId == null).ToList();
 
         // Group by status into columns
         var tasksByStatus = tasks.ToLookup(t => t.Status);