App/Sources/Enumerations/TodoGroup.swift

@@ -5,16 +5,6 @@ import SwiftUI
 ///
 /// This enumeration provides a semantic grouping mechanism for organizing and filtering todo tasks throughout the application.
 /// Each case represents a distinct category that helps users manage their tasks based on temporal relevance and completion state.
-///
-/// ## Features
-/// - Provides localized titles and icons for each group
-/// - Supports filtering of completed tasks within temporal groups
-/// - Enables color-coded visual categorization
-///
-/// ## Groups
-/// Groups are categorized into two types:
-/// - **Temporal groups** (`.today`, `.upcoming`, `.overdue`): Time-based categorization that can optionally include completed tasks
-/// - **Status group** (`.completed`): Contains all completed tasks regardless of due date
 enum TodoGroup {
     /// Tasks that have been marked as done, regardless of due date.
     case completed
@@ -33,14 +23,19 @@ extension TodoGroup {
     /// Indicates whether this group supports toggling the visibility of completed tasks.
     ///
     /// This property determines if a show/hide completed tasks action should be available for the group.
-    ///
-    /// - Returns: `true` for temporal groups (`.today`, `.upcoming`, `.overdue`) that can optionally
-    ///   show or hide completed tasks. Returns `false` for the `.completed` group since it exclusively
-    ///   displays completed tasks.
     var canShowCompleted: Bool {
         self != .completed
     }
 
+    /// Indicates whether tasks in this group can be reordered through drag and drop.
+    ///
+    /// This property determines if the user should be able to manually reorder tasks within the group.
+    /// Reordering is useful for temporal groups where users may want to prioritize certain tasks,
+    /// but is disabled for completed tasks since they are typically sorted by completion date.
+    var canReorder: Bool {
+        self != .completed
+    }
+
     /// The color associated with the task group.
     var color: Color {
         switch self {

UnitTests/Tests/Enumerations/TodoGroupTests.swift

@@ -28,6 +28,25 @@ struct TodoGroupTests {
         #expect(canShowCompleted == expectation)
     }
 
+    @Test(
+        "canReorder returns correct values",
+        arguments: zip(
+            TodoGroup.allCases,
+            [true, true, true, false]
+        )
+    )
+    func canReorder(
+        for group: TodoGroup,
+        expects expectation: Bool
+    ) {
+        // GIVEN
+        // WHEN
+        let canReorder = group.canReorder
+
+        // THEN
+        #expect(canReorder == expectation)
+    }
+
     @Test(
         "group color match expected values",
         arguments: zip(