first commit

src/boot/lang.js

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+import { createI18n } from 'vue-i18n';
+import yaml from 'js-yaml';
+
+export const lang = [];
+
+const systemLocale = navigator.language || 'en-US';
+const savedLang = localStorage.getItem('lang');
+
+const messages = {};
+const modules = import.meta.glob('src/assets/lang/*.yaml', {
+  eager: true,
+  import: 'default',
+  query: '?raw',
+});
+
+for (const path in modules) {
+  const raw = modules[path];
+  const parsed = yaml.load(raw);
+
+  // Extract the file name (e.g., "en.yaml" → "en")
+  const locale = path.split('/').pop().replace('.yaml', '');
+
+  lang.push(locale);
+  messages[locale] = parsed;
+}
+
+const i18n = createI18n({
+  legacy: false, // Composition API mode
+  locale: savedLang || systemLocale,
+  fallbackLocale: systemLocale,
+  messages,
+});
+
+export default ({ app }) => {
+  app.use(i18n);
+};
+
+export { i18n };