feat: implement client backend

This includes temporary AI-generated frontend scaffolding, none of this will be used in production. It was just used during development for the backend.

ui/components/icon.slint

@@ -0,0 +1,14 @@
+/// TEMPORARY AI GENERATED FRONTEND \\\
+///   NOT TO BE USED IN PRODUCTION  \\\
+
+import { Theme } from "../theme.slint";
+
+// A recolourable icon. Usage: `Icon { source: Icons.hash; tint: Theme.text-muted; }`
+export component Icon inherits Image {
+    in property <color> tint: Theme.text-muted;
+    in property <length> icon-size: 20px;
+    width: icon-size;
+    height: icon-size;
+    colorize: tint;
+    image-fit: contain;
+}