feat: add initial e2e tests

app/vite.config.ts

@@ -1,9 +1,10 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import tailwindcss from '@tailwindcss/vite';
-import { defineConfig } from 'vite';
+import { playwright } from '@vitest/browser-playwright';
 import comlink from 'vite-plugin-comlink';
 import glsl from 'vite-plugin-glsl';
 import wasm from 'vite-plugin-wasm';
+import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   plugins: [
@@ -20,5 +21,36 @@ export default defineConfig({
   },
   ssr: {
     noExternal: ['three']
+  },
+  build: {
+    chunkSizeWarningLimit: 2000
+  },
+  test: {
+    expect: { requireAssertions: true },
+    projects: [
+      {
+        extends: './vite.config.ts',
+        test: {
+          name: 'client',
+          browser: {
+            enabled: true,
+            provider: playwright(),
+            instances: [{ browser: 'firefox', headless: true }]
+          },
+          include: ['src/**/*.svelte.{test,spec}.{js,ts}'],
+          exclude: ['src/lib/server/**']
+        }
+      },
+
+      {
+        extends: './vite.config.ts',
+        test: {
+          name: 'server',
+          environment: 'node',
+          include: ['src/**/*.{test,spec}.{js,ts}'],
+          exclude: ['src/**/*.svelte.{test,spec}.{js,ts}']
+        }
+      }
+    ]
   }
 });