improve Frontend

src/ClaudeDo.Data/Repositories/TaskRepository.cs

@@ -14,6 +14,13 @@ public sealed class TaskRepository
 
     public async Task AddAsync(TaskEntity entity, CancellationToken ct = default)
     {
+        // Append at bottom of the list by default: SortOrder = max(listId) + 1.
+        var maxSort = await _context.Tasks
+            .Where(t => t.ListId == entity.ListId)
+            .Select(t => (int?)t.SortOrder)
+            .MaxAsync(ct);
+        entity.SortOrder = (maxSort ?? -1) + 1;
+
         _context.Tasks.Add(entity);
         await _context.SaveChangesAsync(ct);
     }
@@ -38,10 +45,32 @@ public sealed class TaskRepository
     {
         return await _context.Tasks
             .Where(t => t.ListId == listId)
-            .OrderBy(t => t.CreatedAt)
+            .OrderBy(t => t.SortOrder).ThenBy(t => t.CreatedAt)
             .ToListAsync(ct);
     }
 
+    /// <summary>
+    /// Renumbers tasks in a list to 0..N-1 according to <paramref name="orderedTaskIds"/>.
+    /// Ids not belonging to the list are ignored; ids missing from the list are untouched.
+    /// </summary>
+    public async Task ReorderAsync(string listId, IReadOnlyList<string> orderedTaskIds, CancellationToken ct = default)
+    {
+        if (orderedTaskIds.Count == 0) return;
+
+        var idSet = orderedTaskIds.ToHashSet();
+        var tasks = await _context.Tasks
+            .Where(t => t.ListId == listId && idSet.Contains(t.Id))
+            .ToListAsync(ct);
+
+        for (int i = 0; i < orderedTaskIds.Count; i++)
+        {
+            var task = tasks.FirstOrDefault(t => t.Id == orderedTaskIds[i]);
+            if (task is not null) task.SortOrder = i;
+        }
+
+        await _context.SaveChangesAsync(ct);
+    }
+
     // Kept for backwards-compatibility with callers using the old name.
     public Task<List<TaskEntity>> GetByListAsync(string listId, CancellationToken ct = default)
         => GetByListIdAsync(listId, ct);
@@ -205,7 +234,7 @@ public sealed class TaskRepository
                           WHERE lt.list_id = t.list_id AND tg.name = 'agent'
                       )
                   )
-                ORDER BY t.created_at ASC
+                ORDER BY t.sort_order ASC, t.created_at ASC
                 LIMIT 1
             )
             RETURNING *