Added Oxibadge, a minimal Tauri + Svelte desktop client

Scaffolds the oxibadge crate/frontend as a new workspace member, stripped
down to a bare hello-world, and
extends the CI pipeline

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

oxibadge/svelte.config.js

@@ -0,0 +1,18 @@
+// Tauri doesn't have a Node.js server to do proper SSR
+// so we use adapter-static with a fallback to index.html to put the site in SPA mode
+// See: https://svelte.dev/docs/kit/single-page-apps
+// See: https://v2.tauri.app/start/frontend/sveltekit/ for more info
+import adapter from "@sveltejs/adapter-static";
+import { vitePreprocess } from "@sveltejs/vite-plugin-svelte";
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+  preprocess: vitePreprocess(),
+  kit: {
+    adapter: adapter({
+      fallback: "index.html",
+    }),
+  },
+};
+
+export default config;