Switch from Qt6 to Slint

ui/appwindow.slint

@@ -0,0 +1,26 @@
+import { Backend } from "Backend.slint";
+import { Button, VerticalBox, CheckBox, Palette } from "std-widgets.slint";
+import { SideBar } from "SideBar.slint";
+import { MainView } from "MainView.slint";
+import { TaskEdit } from "windows/TaskEdit.slint";
+import { EventWindow } from "windows/EventWindow.slint";
+
+export component AppWindow inherits Window {
+
+	title: "Mirai";
+	min-height: 100px;
+	max-height: 4000px; // needed, otherwise the window wants to fit the content (on Swaywm)
+	default-font-size: 16px;
+
+	in-out property<string> test;
+
+    HorizontalLayout {
+		SideBar {}
+		MainView {
+			horizontal-stretch: 1;
+		}
+     }
+	
+}
+
+export { Backend, TaskEdit, EventWindow } // Export to make it visible to the C++ backend