feat/e2e-testing (#31)

Reviewed-on: #31
Co-authored-by: Max Richter <max@max-richter.dev>
Co-committed-by: Max Richter <max@max-richter.dev>

packages/ui/package.json

@@ -34,14 +34,17 @@
     "@eslint/eslintrc": "^3.3.3",
     "@eslint/js": "^9.39.2",
     "@nodarium/types": "workspace:",
+    "@playwright/test": "^1.58.1",
     "@sveltejs/adapter-static": "^3.0.10",
     "@sveltejs/kit": "^2.50.0",
     "@sveltejs/package": "^2.5.7",
     "@sveltejs/vite-plugin-svelte": "^6.2.4",
+    "@testing-library/svelte": "^5.3.1",
     "@types/eslint": "^9.6.1",
     "@types/three": "^0.182.0",
     "@typescript-eslint/eslint-plugin": "^8.53.0",
     "@typescript-eslint/parser": "^8.53.0",
+    "@vitest/browser-playwright": "^4.0.18",
     "dprint": "^0.51.1",
     "eslint": "^9.39.2",
     "eslint-plugin-svelte": "^3.14.0",
@@ -54,7 +57,8 @@
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.54.0",
     "vite": "^7.3.1",
-    "vitest": "^4.0.17"
+    "vitest": "^4.0.18",
+    "vitest-browser-svelte": "^2.0.2"
   },
   "svelte": "./dist/index.js",
   "types": "./dist/index.d.ts",