Add Pico dashboard main entrypoint

tests/test_pico_core.py

@@ -817,3 +817,21 @@ def test_pico_dashboard_app_tick_updates_alarms_and_buzzer():
     assert "fridge_zone_1_high" in app.alarms
     assert buzzer.enabled is True
     assert display.commands
+
+
+def test_pico_main_builds_app():
+    import main
+
+    app = main.build_app()
+
+    assert app.state is not None
+    assert app.comms is not None
+    assert app.screen_manager.current_screen == "dashboard"
+
+
+def test_pico_main_runs_one_tick():
+    import main
+
+    app = main.main()
+
+    assert app is not None