added button to close program

src/program.py

@@ -3,7 +3,7 @@ from enum import Enum
 
 import boto3
 from mypy_boto3_ec2 import EC2ServiceResource
-from nicegui import ui
+from nicegui import app, ui
 from nicegui.element import Element
 from rich.console import Console
 from rich.logging import RichHandler
@@ -80,7 +80,9 @@ def nicegui_ui() -> None:
         ui.button(
             "Stop Foundry AWS Server",
             on_click=lambda: aws_launch_ec2(ec2_resource, mode=InstanceMode.STOP),
-        )
+        ),
+        ui.button("Close Program", on_click=lambda: app.shutdown())
+
     columns = [
         {"name": "name", "label": "Name", "field": "name", "required": True},
         {"name": "status", "label": "Status", "field": "status"},
@@ -92,7 +94,7 @@ def nicegui_ui() -> None:
         15, lambda: update_instance_table(ec2_resource, container, columns)
     )
     label = ui.label()
-    slider = (
+    (
         ui.slider(min=5, max=120, step=5, value=15)
         .bind_value_to(timer, "interval")
         .bind_value_to(label, "text")