Scaffold pinned Svelte frontend toolchain

Add a strict TypeScript and Vite workspace with reproducible Node, npm, and dependency versions plus Make targets for checking and building it.

web/src/main.ts

@@ -0,0 +1,10 @@
+import { mount } from 'svelte';
+import App from './App.svelte';
+
+const target = document.getElementById('app');
+
+if (target === null) {
+  throw new Error('Missing application mount point');
+}
+
+mount(App, { target });