Task deletion feature (#7)

This PR contains the work done to add support for todo tasks deletion on the *Task list* view.

Reviewed-on: rock-n-code/todos-app#7
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/View Models/TaskListViewModel.swift

@@ -1,3 +1,4 @@
+import Foundation
 import SwiftData
 import SwiftUI
 
@@ -84,6 +85,26 @@ extension TaskListView {
 
         // MARK: Methods
 
+        /// Deletes tasks at the specified indices.
+        ///
+        /// This method removes tasks from the model context after a swipe-to-delete action.
+        /// The deletion is performed through SwiftData's model context, which handles
+        /// persistence and triggers automatic UI updates.
+        ///
+        /// - Parameters:
+        ///   - tasks: The current array of tasks.
+        ///   - offsets: The index set of tasks to delete.
+        ///   - modelContext: The SwiftData model context to perform the deletion.
+        func deleteTasks(
+            _ tasks: [Todo],
+            at offsets: IndexSet,
+            from modelContext: ModelContext
+        ) {
+            for index in offsets {
+                modelContext.delete(tasks[index])
+            }
+        }
+
         /// Reorders tasks after a drag and drop operation.
         ///
         /// This method is called when users drag and drop tasks to reorder them within a group.