[tui] Open application with no editor tab.

The explorer can be used to open the first tab.

src/tui/app.rs

@@ -20,6 +20,9 @@ use ratatui::widgets::{Paragraph, Wrap};
 use std::path::PathBuf;
 use std::time::Duration;
 
+// TODO: Need a way to dynamically run Widget::render on all widgets.
+// TODO: + Need a way to map Rect to Component::id() to position each widget?
+// TODO: Need a good way to dynamically run Component methods on all widgets.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum AppComponent {
     AppEditor,