Group tasks feature (#3)

This PR contains the work done to implement the **Group Task** feature, and to integrate it into the main content view of the app. Furthermore, an issue related to triggering a view update after inserting the todo tasks into the model container has been fixed.

Reviewed-on: rock-n-code/todos-app#3
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/Views/NewTaskView.swift

@@ -52,7 +52,7 @@ struct NewTaskView: View {
                         "view.new-task.placeholder.title",
                         text: $viewModel.title
                     )
-                    .autocapitalization(.none)
+                    .autocapitalization(.sentences)
                     .autocorrectionDisabled(false)
                     .keyboardType(.asciiCapable)
 
@@ -61,7 +61,7 @@ struct NewTaskView: View {
                         text: $viewModel.note,
                         axis: .vertical
                     )
-                    .autocapitalization(.none)
+                    .autocapitalization(.sentences)
                     .autocorrectionDisabled(false)
                     .keyboardType(.asciiCapable)
                     .lineLimit(3 ... 6)
@@ -99,7 +99,9 @@ struct NewTaskView: View {
 
 // MARK: - Previews
 
-#Preview("New todo task") {
+#Preview(
+    "New todo task",
+    traits: .emptyContainer
+) {
     NewTaskView()
-        .modelContainer(for: Todo.self, inMemory: true)
 }