test: добавить площадку интеграционного тестирования

- добавлены consumer fixtures для React и Next.js
- добавлены typecheck, production build и браузерные smoke-тесты
- добавлена интеграционная проверка в CI

integration/apps/nuxt/app/app.vue

@@ -0,0 +1,32 @@
+<template>
+  <main>
+    <h1>Nuxt</h1>
+    <svg
+      data-testid="icon"
+      data-app="nuxt"
+      aria-label="Check icon"
+      viewBox="0 0 24 24"
+    >
+      <use href="/sprites/icons.sprite.svg#check" />
+    </svg>
+  </main>
+</template>
+
+<style>
+:root {
+  font-family: system-ui, sans-serif;
+  color: #172033;
+  background: #fff;
+}
+
+body {
+  margin: 0;
+  padding: 40px;
+}
+
+[data-testid='icon'] {
+  width: 64px;
+  height: 64px;
+  color: #16a34a;
+}
+</style>

integration/apps/nuxt/nuxt.config.ts

@@ -0,0 +1,4 @@
+export default defineNuxtConfig({
+  compatibilityDate: '2026-07-01',
+  devtools: { enabled: false },
+})

integration/apps/nuxt/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@svg-sprites-fixtures/nuxt",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "sprites": "svg-sprites --mode legacy .",
+    "typecheck": "nuxt typecheck",
+    "build": "npm run sprites && nuxt build",
+    "dev": "npm run sprites && nuxt dev",
+    "start": "node .output/server/index.mjs"
+  },
+  "dependencies": {
+    "nuxt": "4.3.1",
+    "vue": "3.5.39"
+  },
+  "devDependencies": {
+    "@gromlab/svg-sprites": "file:../../..",
+    "typescript": "6.0.2",
+    "vue-tsc": "3.3.7"
+  }
+}

integration/apps/nuxt/svg-sprites.config.ts

@@ -0,0 +1,11 @@
+export default {
+  output: 'public/sprites',
+  preview: false,
+  sprites: [
+    {
+      name: 'icons',
+      input: '../../fixtures/icons',
+      format: 'symbol',
+    },
+  ],
+}