improve Frontend

src/ClaudeDo.Data/Migrations/20260422120000_AddTaskSortOrder.cs

@@ -0,0 +1,48 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ClaudeDo.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddTaskSortOrder : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "sort_order",
+                table: "tasks",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+
+            // Backfill existing rows with a per-list dense order (0..N-1) by creation time
+            // so today's UI order is preserved after the migration.
+            migrationBuilder.Sql("""
+                WITH ordered AS (
+                    SELECT id, (row_number() OVER (PARTITION BY list_id ORDER BY created_at) - 1) AS rn
+                    FROM tasks
+                )
+                UPDATE tasks SET sort_order = (SELECT rn FROM ordered WHERE ordered.id = tasks.id);
+                """);
+
+            migrationBuilder.CreateIndex(
+                name: "idx_tasks_list_sort",
+                table: "tasks",
+                columns: new[] { "list_id", "sort_order" });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "idx_tasks_list_sort",
+                table: "tasks");
+
+            migrationBuilder.DropColumn(
+                name: "sort_order",
+                table: "tasks");
+        }
+    }
+}

src/ClaudeDo.Data/Migrations/ClaudeDoDbContextModelSnapshot.cs

@@ -281,6 +281,12 @@ namespace ClaudeDo.Data.Migrations
                         .HasColumnType("TEXT")
                         .HasColumnName("scheduled_for");
 
+                    b.Property<int>("SortOrder")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER")
+                        .HasDefaultValue(0)
+                        .HasColumnName("sort_order");
+
                     b.Property<DateTime?>("StartedAt")
                         .HasColumnType("TEXT")
                         .HasColumnName("started_at");
@@ -307,6 +313,9 @@ namespace ClaudeDo.Data.Migrations
                     b.HasIndex("Status")
                         .HasDatabaseName("idx_tasks_status");
 
+                    b.HasIndex("ListId", "SortOrder")
+                        .HasDatabaseName("idx_tasks_list_sort");
+
                     b.ToTable("tasks", (string)null);
                 });