refactor email viewer app

maildir_gtd/actions/open.py

@@ -0,0 +1,16 @@
+from maildir_gtd.screens.OpenMessage import OpenMessageScreen
+
+
+def action_open(app) -> None:
+    """Show the input modal for opening a specific message by ID."""
+    def check_id(message_id: str) -> bool:
+        try:
+            int(message_id)
+            app.show_status(f"Opening message {message_id}...")
+            app.current_message_id = message_id
+            app.show_message(app.current_message_id)
+        except ValueError:
+            app.show_status("Invalid message ID. Please enter an integer.", severity="error")
+            return True
+        return False
+    app.push_screen(OpenMessageScreen(), check_id)