i18n: automatyczny język + ręczny przełącznik

src/App.vue

@@ -1,6 +1,7 @@
 <script setup>
 import { onMounted, ref } from 'vue';
 import { usePuzzleStore } from './stores/puzzle';
+import { useI18n } from './composables/useI18n';
 import GameBoard from './components/GameBoard.vue';
 import LevelSelector from './components/LevelSelector.vue';
 import StatusPanel from './components/StatusPanel.vue';
@@ -12,6 +13,7 @@ import FixedBar from './components/FixedBar.vue';
 
 // Main App Entry
 const store = usePuzzleStore();
+const { t, locale, setLocale } = useI18n();
 const showCustomModal = ref(false);
 const showGuide = ref(false);
 
@@ -27,7 +29,11 @@ onMounted(() => {
     <FixedBar />
 
     <header class="game-header">
-      <h1>NONOGRAMS</h1>
+      <h1>{{ t('app.title') }}</h1>
+      <div class="lang-toggle">
+        <button class="lang-btn" :class="{ active: locale === 'pl' }" @click="setLocale('pl')">PL</button>
+        <button class="lang-btn" :class="{ active: locale === 'en' }" @click="setLocale('en')">EN</button>
+      </div>
       <div class="underline"></div>
     </header>
 
@@ -96,6 +102,38 @@ h1 {
   box-shadow: 0 0 10px var(--primary-accent);
 }
 
+.lang-toggle {
+  display: inline-flex;
+  gap: 8px;
+  margin-top: 12px;
+  padding: 6px 10px;
+  border-radius: 999px;
+  background: rgba(255, 255, 255, 0.08);
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
+}
+
+.lang-btn {
+  background: transparent;
+  border: 1px solid rgba(255, 255, 255, 0.2);
+  color: #fff;
+  padding: 4px 10px;
+  border-radius: 999px;
+  font-size: 0.8rem;
+  letter-spacing: 1px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+}
+
+.lang-btn.active {
+  border-color: var(--primary-accent);
+  box-shadow: 0 0 10px rgba(0, 242, 255, 0.3);
+}
+
+.lang-btn:hover {
+  border-color: #fff;
+}
+
 .game-layout {
   display: flex;
   flex-direction: column;