Debouncing and form validation improvements

Shared/Debounce.swift

@@ -0,0 +1,15 @@
+import Foundation
+
+struct Debounce {
+    private var timer: Timer?
+
+    mutating func debouncing(_ interval: TimeInterval, action: @escaping () -> Void) {
+        timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: false) { _ in
+            action()
+        }
+    }
+
+    func invalidate() {
+        timer?.invalidate()
+    }
+}