feat: scaffold Tauri + Svelte client

SvelteKit in SPA mode with Tauri v2. Builds and produces .deb bundle.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/routes/+layout.ts

@@ -0,0 +1,5 @@
+// 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;

client/src/routes/+page.svelte

@@ -0,0 +1,20 @@
+<script lang="ts">
+</script>
+
+<main>
+  <h1>8-cut</h1>
+</main>
+
+<style>
+  :global(body) {
+    margin: 0;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+    background: #1e1e1e;
+    color: #e0e0e0;
+  }
+  main {
+    padding: 8px;
+    height: 100vh;
+    box-sizing: border-box;
+  }
+</style>