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/editor-poc.html

@@ -1822,19 +1822,24 @@ body { font-family: var(--sans); background: var(--bg); color: var(--text); heig
     var lastChar = fullText.slice(-1);
     var midWord = /[a-zA-Z0-9\u00C0-\u024F]$/.test(lastChar);
 
+    // Get user's preferred language
+    var lang = 'fr';
+    try { lang = localStorage.getItem('obsigate-lang') || 'fr'; } catch(e) {}
+    var langNames = { fr: 'French', en: 'English', es: 'Spanish', de: 'German' };
+    var langName = langNames[lang] || 'French';
+
     var prompt, inputText;
     if (midWord) {
       var wordMatch = fullText.match(/([\w\u00C0-\u024F]+)$/);
       var partialWord = wordMatch ? wordMatch[1] : fullText;
       inputText = partialWord;
-      // Provide surrounding context so the model can guess the word
       var context = fullText.slice(0, -partialWord.length).trim();
-      prompt = 'Complete this French word. The word is: "' + partialWord +
+      prompt = 'Complete this ' + langName + ' word. The word is: "' + partialWord +
         '". Context: "' + (context || '(start of line)') +
-        '". Return ONLY the remaining letters of the word. Example: if word is "famil" return "ial" for "familial". Do NOT add spaces.';
+        '". Return ONLY the remaining letters. Do NOT add spaces. Example: "famil" → "ial" for "familial".';
     } else {
       inputText = fullText;
-      prompt = 'Continue this text. Return ONLY the new text (do NOT repeat what is already written):\n' + fullText;
+      prompt = 'Continue this ' + langName + ' text naturally. Return ONLY the new text (do NOT repeat):\n' + fullText;
     }
 
     fetch('/api/ai/inline-complete', {