Add timestamp editor

common/common.go

@@ -65,3 +65,7 @@ func (c *Common) PopPage() (Component, error) {
 	component.SetSize(c.width, c.height)
 	return component, nil
 }
+
+func (c *Common) HasSubpages() bool {
+	return !c.pageStack.IsEmpty()
+}

common/stack.go

@@ -38,3 +38,10 @@ func (s *Stack[T]) Pop() (T, error) {
 
 	return item, nil
 }
+
+func (s *Stack[T]) IsEmpty() bool {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	return len(s.items) == 0
+}