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/src/app.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%sveltekit.assets%/logo.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Oxibadge</title>
+    %sveltekit.head%
+  </head>
+  <body data-sveltekit-preload-data="hover">
+    <div style="display: contents">%sveltekit.body%</div>
+  </body>
+</html>

oxibadge/src/routes/+layout.ts

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+// 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
+export const ssr = false;

oxibadge/src/routes/+page.svelte

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+<main>
+  <img src="/logo.svg" alt="Oxibadge logo" class="logo" />
+  <h1>Hello, world!</h1>
+</main>
+
+<style>
+  :global(body) {
+    margin: 0;
+    color: #f6f6f6;
+    background-color: #2f2f2f;
+    font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
+  }
+
+  main {
+    min-height: 100vh;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 1.5rem;
+  }
+
+  .logo {
+    width: 8rem;
+    height: 8rem;
+  }
+
+  h1 {
+    margin: 0;
+    font-size: 2rem;
+    font-weight: 500;
+  }
+</style>