feat: section Profil (langue) + ghost text lie a la langue

- Section Profil dans Configuration: langue (fr/en/es/de), nom
- Persistance localStorage (obsigate-lang, obsigate-name)
- Ghost text adapte le prompt a la langue du profil
- CSS profile-form, config-select stylise

frontend/js/config.js

@@ -644,6 +644,9 @@ function initConfigModal() {
 
   // Init theme picker
   initThemePicker();
+
+  // Init profile
+  initProfile();
 }
 
 function closeConfigModal() {
@@ -1387,6 +1390,7 @@ export {
   loadHiddenFilesSettings as initHiddenFilesConfig,
   initThemePicker,
   initAboutModal,
+  initProfile,
   switchSidebarTab,
 };
 
@@ -1508,3 +1512,28 @@ function initAboutModal() {
     if (jokeEl) jokeEl.textContent = '« ' + jokes[Math.floor(Math.random() * jokes.length)] + ' »';
   }
 }
+
+// ── Profile ──────────────────────────────────────────────────────────
+function initProfile() {
+  var langSel = document.getElementById('profile-lang');
+  var nameInp = document.getElementById('profile-name');
+  var saveBtn = document.getElementById('profile-save');
+  var savedEl = document.getElementById('profile-saved');
+  if (!langSel || !saveBtn) return;
+
+  // Load saved profile
+  try {
+    var lang = localStorage.getItem('obsigate-lang') || 'fr';
+    var name = localStorage.getItem('obsigate-name') || '';
+    if (langSel) langSel.value = lang;
+    if (nameInp) nameInp.value = name;
+  } catch(e) {}
+
+  saveBtn.addEventListener('click', function() {
+    try {
+      localStorage.setItem('obsigate-lang', langSel.value);
+      if (nameInp) localStorage.setItem('obsigate-name', nameInp.value.trim());
+      if (savedEl) { savedEl.style.display = 'inline'; setTimeout(function() { savedEl.style.display = 'none'; }, 2000); }
+    } catch(e) {}
+  });
+}