Task edition improvements (#9)

This PR contains the work done to improve upon the editing experience on the **Task list item and the **New task** views.

Reviewed-on: rock-n-code/todos-app#9
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

App/Sources/View Modifiers/ResignFocusModifier.swift

@@ -0,0 +1,43 @@
+import SwiftUI
+
+/// A view modifier that resigns the first responder status when the view is tapped.
+///
+/// This modifier is useful for dismissing the keyboard or other input controls
+/// when the user taps on an area of the view that doesn't have interactive content.
+struct ResignFocusModifier: ViewModifier {
+
+    // MARK: Body
+
+    /// The content and behavior of the view modifier.
+    ///
+    /// Adds a tap gesture that sends the `resignFirstResponder` action
+    /// to dismiss any active first responder (such as a text field).
+    func body(content: Content) -> some View {
+        content
+            .onTapGesture {
+                UIApplication.shared.sendAction(
+                    #selector(UIResponder.resignFirstResponder),
+                    to: nil,
+                    from: nil,
+                    for: nil
+                )
+            }
+    }
+
+}
+
+// MARK: - View Extension
+
+extension View {
+
+    /// Adds a tap gesture that resigns the first responder when the view is tapped.
+    ///
+    /// This is useful for dismissing the keyboard or other input controls
+    /// when the user taps outside of an interactive element.
+    ///
+    /// - Returns: A view that resigns first responder status on tap.
+    func onResignFocus() -> some View {
+        modifier(ResignFocusModifier())
+    }
+
+}