fix(i18n): localize the new session form

src/components/sidebar/view/subcomponents/SidebarNewSession.test.tsx

@@ -0,0 +1,103 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import i18next from 'i18next';
+import { createElement } from 'react';
+import { I18nextProvider } from 'react-i18next';
+import { renderToStaticMarkup } from 'react-dom/server';
+
+import deSidebar from '../../../../i18n/locales/de/sidebar.json';
+import enSidebar from '../../../../i18n/locales/en/sidebar.json';
+import frSidebar from '../../../../i18n/locales/fr/sidebar.json';
+import itSidebar from '../../../../i18n/locales/it/sidebar.json';
+import jaSidebar from '../../../../i18n/locales/ja/sidebar.json';
+import koSidebar from '../../../../i18n/locales/ko/sidebar.json';
+import ruSidebar from '../../../../i18n/locales/ru/sidebar.json';
+import trSidebar from '../../../../i18n/locales/tr/sidebar.json';
+import zhCNSidebar from '../../../../i18n/locales/zh-CN/sidebar.json';
+import zhTWSidebar from '../../../../i18n/locales/zh-TW/sidebar.json';
+
+import SidebarNewSession from './SidebarNewSession';
+
+const localeResources = {
+  de: deSidebar,
+  en: enSidebar,
+  fr: frSidebar,
+  it: itSidebar,
+  ja: jaSidebar,
+  ko: koSidebar,
+  ru: ruSidebar,
+  tr: trSidebar,
+  'zh-CN': zhCNSidebar,
+  'zh-TW': zhTWSidebar,
+};
+
+const requiredKeys = [
+  'open',
+  'sessionNamePlaceholder',
+  'workingDirectoryPlaceholder',
+  'cancel',
+  'creating',
+  'create',
+  'errors.towerUnavailable',
+  'errors.nameConflict',
+  'errors.createFailed',
+];
+
+const readPath = (value: unknown, keyPath: string): unknown => (
+  keyPath.split('.').reduce<unknown>((current, segment) => (
+    current && typeof current === 'object'
+      ? (current as Record<string, unknown>)[segment]
+      : undefined
+  ), value)
+);
+
+test('all supported sidebar locales define the complete new-session form', () => {
+  for (const [locale, resource] of Object.entries(localeResources)) {
+    for (const key of requiredKeys) {
+      const value = readPath(resource.newSessionForm, key);
+      assert.equal(typeof value, 'string', `${locale} is missing newSessionForm.${key}`);
+      assert.notEqual(value, '', `${locale} has an empty newSessionForm.${key}`);
+    }
+  }
+});
+
+const renderForm = async (locale: 'en' | 'ko') => {
+  const instance = i18next.createInstance();
+  await instance.init({
+    lng: locale,
+    fallbackLng: false,
+    resources: {
+      [locale]: { sidebar: localeResources[locale] },
+    },
+    ns: ['sidebar'],
+    defaultNS: 'sidebar',
+    interpolation: { escapeValue: false },
+  });
+
+  return renderToStaticMarkup(
+    createElement(
+      I18nextProvider,
+      { i18n: instance },
+      createElement(SidebarNewSession, { onCreated: () => {}, initiallyOpen: true }),
+    ),
+  );
+};
+
+test('English and Korean render the new-session form without mixed-language copy', async () => {
+  const english = await renderForm('en');
+  assert.ok(english.includes(enSidebar.newSessionForm.sessionNamePlaceholder));
+  assert.ok(english.includes(enSidebar.newSessionForm.workingDirectoryPlaceholder));
+  assert.ok(english.includes(enSidebar.newSessionForm.cancel));
+  assert.ok(english.includes(enSidebar.newSessionForm.create));
+  assert.ok(!english.includes(koSidebar.newSessionForm.sessionNamePlaceholder));
+  assert.ok(!english.includes(koSidebar.newSessionForm.cancel));
+
+  const korean = await renderForm('ko');
+  assert.ok(korean.includes(koSidebar.newSessionForm.sessionNamePlaceholder));
+  assert.ok(korean.includes(koSidebar.newSessionForm.workingDirectoryPlaceholder));
+  assert.ok(korean.includes(koSidebar.newSessionForm.cancel));
+  assert.ok(korean.includes(koSidebar.newSessionForm.create));
+  assert.ok(!korean.includes(enSidebar.newSessionForm.sessionNamePlaceholder));
+  assert.ok(!korean.includes(enSidebar.newSessionForm.cancel));
+});

src/components/sidebar/view/subcomponents/SidebarNewSession.tsx

@@ -1,5 +1,6 @@
 import { useState } from 'react';
 import { Plus } from 'lucide-react';
+import { useTranslation } from 'react-i18next';
 
 import { api } from '../../../../utils/api';
 import HomeDirInput from '../../../../shared/view/HomeDirInput';
@@ -25,8 +26,15 @@ const PROVIDERS: { id: SpawnProvider; label: string }[] = [
  * Unified new-session form. GJC boots through the control tower; every other
  * provider boots its native CLI in tmux through /sessions/external/spawn.
  */
-export default function SidebarNewSession({ onCreated }: { onCreated: () => void }) {
-  const [open, setOpen] = useState(false);
+export default function SidebarNewSession({
+  onCreated,
+  initiallyOpen = false,
+}: {
+  onCreated: () => void;
+  initiallyOpen?: boolean;
+}) {
+  const { t } = useTranslation('sidebar');
+  const [open, setOpen] = useState(initiallyOpen);
   const [provider, setProvider] = useState<SpawnProvider>('gjc');
   const [name, setName] = useState('');
   const [cwd, setCwd] = useState('');
@@ -61,10 +69,12 @@ export default function SidebarNewSession({ onCreated }: { onCreated: () => void
           return;
         }
         const text = data.reachable === false
-          ? '관제탑 미가동 — 생성 불가'
+          ? t('newSessionForm.errors.towerUnavailable')
           : data.conflict
-            ? '같은 이름의 세션이 이미 있습니다'
-            : (typeof body?.error === 'string' && body.error) || data.detail || '세션 생성 실패';
+            ? t('newSessionForm.errors.nameConflict')
+            : (typeof body?.error === 'string' && body.error)
+              || data.detail
+              || t('newSessionForm.errors.createFailed');
         setStatus({ kind: 'error', text });
         return;
       }
@@ -77,9 +87,12 @@ export default function SidebarNewSession({ onCreated }: { onCreated: () => void
         onCreated();
         return;
       }
-      setStatus({ kind: 'error', text: body?.error?.message ?? body?.message ?? '세션 생성 실패' });
+      setStatus({
+        kind: 'error',
+        text: body?.error?.message ?? body?.message ?? t('newSessionForm.errors.createFailed'),
+      });
     } catch {
-      setStatus({ kind: 'error', text: '세션 생성 실패' });
+      setStatus({ kind: 'error', text: t('newSessionForm.errors.createFailed') });
     }
   };
 
@@ -91,7 +104,7 @@ export default function SidebarNewSession({ onCreated }: { onCreated: () => void
           onClick={() => setOpen(true)}
           className="flex w-full items-center justify-center gap-1.5 rounded-md border border-dashed border-border px-2 py-2 text-xs font-medium text-muted-foreground transition-colors hover:border-primary/50 hover:text-foreground"
         >
-          <Plus className="h-3.5 w-3.5" />새 세션
+          <Plus className="h-3.5 w-3.5" />{t('newSessionForm.open')}
         </button>
       </div>
     );
@@ -119,14 +132,14 @@ export default function SidebarNewSession({ onCreated }: { onCreated: () => void
       <input
         value={name}
         onChange={(event) => setName(event.target.value)}
-        placeholder="세션 이름 (영숫자, 예: my-feature)"
+        placeholder={t('newSessionForm.sessionNamePlaceholder')}
         className="w-full rounded-md border border-border bg-transparent px-2 py-1.5 text-sm outline-none focus:border-primary/60"
       />
       <HomeDirInput
         value={cwd}
         onChange={setCwd}
         onSubmit={() => void spawn()}
-        placeholder="작업 폴더 (예: ~/workspace/my-proj, 절대경로 가능)"
+        placeholder={t('newSessionForm.workingDirectoryPlaceholder')}
       />
       {status.kind === 'error' && <p className="text-[11px] text-red-500">{status.text}</p>}
       <div className="flex items-center justify-end gap-2">
@@ -135,15 +148,17 @@ export default function SidebarNewSession({ onCreated }: { onCreated: () => void
           onClick={() => { setOpen(false); reset(); }}
           className="rounded-md px-2 py-1 text-xs text-muted-foreground transition-colors hover:text-foreground"
         >
-          취소
+          {t('newSessionForm.cancel')}
         </button>
         <button
           type="button"
           onClick={() => void spawn()}
           disabled={!name.trim() || !cwd.trim() || status.kind === 'spawning'}
           className="rounded-md bg-primary px-3 py-1 text-xs font-medium text-primary-foreground transition-colors hover:brightness-110 disabled:cursor-not-allowed disabled:opacity-50"
         >
-          {status.kind === 'spawning' ? '생성 중…' : '만들기'}
+          {status.kind === 'spawning'
+            ? t('newSessionForm.creating')
+            : t('newSessionForm.create')}
         </button>
       </div>
     </div>

src/i18n/config.js

@@ -23,6 +23,15 @@ import enCodeEditor from './locales/en/codeEditor.json';
 // eslint-disable-next-line import-x/order
 import enTasks from './locales/en/tasks.json';
 
+import frCommon from './locales/fr/common.json';
+import frSettings from './locales/fr/settings.json';
+import frAuth from './locales/fr/auth.json';
+import frSidebar from './locales/fr/sidebar.json';
+import frChat from './locales/fr/chat.json';
+import frCodeEditor from './locales/fr/codeEditor.json';
+// eslint-disable-next-line import-x/order
+import frTasks from './locales/fr/tasks.json';
+
 import koCommon from './locales/ko/common.json';
 import koSettings from './locales/ko/settings.json';
 import koAuth from './locales/ko/auth.json';
@@ -124,6 +133,15 @@ i18n
         codeEditor: enCodeEditor,
         tasks: enTasks,
       },
+      fr: {
+        common: frCommon,
+        settings: frSettings,
+        auth: frAuth,
+        sidebar: frSidebar,
+        chat: frChat,
+        codeEditor: frCodeEditor,
+        tasks: frTasks,
+      },
       ko: {
         common: koCommon,
         settings: koSettings,

src/i18n/locales/de/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Update verfügbar",
     "restartRequired": "Update installiert – zum Anwenden Server neu starten"
   },
+  "newSessionForm": {
+    "open": "Neue Sitzung",
+    "sessionNamePlaceholder": "Sitzungsname (Buchstaben und Zahlen, z. B. mein-feature)",
+    "workingDirectoryPlaceholder": "Arbeitsordner (z. B. ~/workspace/mein-projekt oder absoluter Pfad)",
+    "cancel": "Abbrechen",
+    "creating": "Wird erstellt…",
+    "create": "Erstellen",
+    "errors": {
+      "towerUnavailable": "Kontrollzentrum läuft nicht — Sitzung kann nicht erstellt werden",
+      "nameConflict": "Eine Sitzung mit diesem Namen existiert bereits",
+      "createFailed": "Sitzung konnte nicht erstellt werden"
+    }
+  },
   "search": {
     "modeProjects": "Projekte",
     "modeConversations": "Unterhaltungen",

src/i18n/locales/en/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Update available",
     "restartRequired": "Update installed — restart the server to apply"
   },
+  "newSessionForm": {
+    "open": "New session",
+    "sessionNamePlaceholder": "Session name (letters and numbers, e.g. my-feature)",
+    "workingDirectoryPlaceholder": "Working folder (e.g. ~/workspace/my-proj or an absolute path)",
+    "cancel": "Cancel",
+    "creating": "Creating…",
+    "create": "Create",
+    "errors": {
+      "towerUnavailable": "Control tower is not running — cannot create session",
+      "nameConflict": "A session with this name already exists",
+      "createFailed": "Failed to create session"
+    }
+  },
   "search": {
     "modeProjects": "Projects",
     "modeConversations": "Conversations",

src/i18n/locales/fr/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Mise à jour disponible",
     "restartRequired": "Mise à jour installée — redémarrez le serveur pour l'appliquer"
   },
+  "newSessionForm": {
+    "open": "Nouvelle session",
+    "sessionNamePlaceholder": "Nom de session (lettres et chiffres, ex. ma-fonctionnalite)",
+    "workingDirectoryPlaceholder": "Dossier de travail (ex. ~/workspace/mon-projet ou chemin absolu)",
+    "cancel": "Annuler",
+    "creating": "Création…",
+    "create": "Créer",
+    "errors": {
+      "towerUnavailable": "La tour de contrôle n'est pas active — création impossible",
+      "nameConflict": "Une session portant ce nom existe déjà",
+      "createFailed": "Échec de la création de la session"
+    }
+  },
   "search": {
     "modeProjects": "Projets",
     "modeConversations": "Conversations",

src/i18n/locales/it/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Aggiornamento disponibile",
     "restartRequired": "Aggiornamento installato — riavvia il server per applicarlo"
   },
+  "newSessionForm": {
+    "open": "Nuova sessione",
+    "sessionNamePlaceholder": "Nome sessione (lettere e numeri, es. mia-funzione)",
+    "workingDirectoryPlaceholder": "Cartella di lavoro (es. ~/workspace/mio-progetto o percorso assoluto)",
+    "cancel": "Annulla",
+    "creating": "Creazione…",
+    "create": "Crea",
+    "errors": {
+      "towerUnavailable": "La torre di controllo non è in esecuzione — impossibile creare la sessione",
+      "nameConflict": "Esiste già una sessione con questo nome",
+      "createFailed": "Creazione della sessione non riuscita"
+    }
+  },
   "search": {
     "modeProjects": "Progetti",
     "modeConversations": "Conversazioni",

src/i18n/locales/ja/sidebar.json

@@ -116,6 +116,19 @@
     "updateAvailable": "アップデートあり",
     "restartRequired": "更新が適用されていません。サーバーを再起動してください"
   },
+  "newSessionForm": {
+    "open": "新しいセッション",
+    "sessionNamePlaceholder": "セッション名（英数字、例: my-feature）",
+    "workingDirectoryPlaceholder": "作業フォルダー（例: ~/workspace/my-proj、絶対パスも可）",
+    "cancel": "キャンセル",
+    "creating": "作成中…",
+    "create": "作成",
+    "errors": {
+      "towerUnavailable": "コントロールタワーが停止中のため作成できません",
+      "nameConflict": "同じ名前のセッションがすでに存在します",
+      "createFailed": "セッションの作成に失敗しました"
+    }
+  },
   "deleteConfirmation": {
     "deleteProject": "プロジェクトを除去",
     "deleteSession": "セッションを削除",

src/i18n/locales/ko/sidebar.json

@@ -116,6 +116,19 @@
     "updateAvailable": "업데이트 가능",
     "restartRequired": "업데이트가 설치됨 — 적용하려면 서버를 재시작하세요"
   },
+  "newSessionForm": {
+    "open": "새 세션",
+    "sessionNamePlaceholder": "세션 이름 (영숫자, 예: my-feature)",
+    "workingDirectoryPlaceholder": "작업 폴더 (예: ~/workspace/my-proj, 절대 경로 가능)",
+    "cancel": "취소",
+    "creating": "생성 중…",
+    "create": "만들기",
+    "errors": {
+      "towerUnavailable": "관제탑 미가동 — 생성 불가",
+      "nameConflict": "같은 이름의 세션이 이미 있습니다",
+      "createFailed": "세션 생성 실패"
+    }
+  },
   "deleteConfirmation": {
     "deleteProject": "프로젝트 제거",
     "deleteSession": "세션 삭제",

src/i18n/locales/ru/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Доступно обновление",
     "restartRequired": "Обновление установлено — перезапустите сервер для применения"
   },
+  "newSessionForm": {
+    "open": "Новый сеанс",
+    "sessionNamePlaceholder": "Имя сеанса (буквы и цифры, например my-feature)",
+    "workingDirectoryPlaceholder": "Рабочая папка (например ~/workspace/my-proj или абсолютный путь)",
+    "cancel": "Отмена",
+    "creating": "Создание…",
+    "create": "Создать",
+    "errors": {
+      "towerUnavailable": "Центр управления не запущен — создать сеанс невозможно",
+      "nameConflict": "Сеанс с таким именем уже существует",
+      "createFailed": "Не удалось создать сеанс"
+    }
+  },
   "search": {
     "modeProjects": "Проекты",
     "modeConversations": "Разговоры",

src/i18n/locales/tr/sidebar.json

@@ -117,6 +117,19 @@
     "updateAvailable": "Güncelleme mevcut",
     "restartRequired": "Güncelleme yüklendi — uygulamak için sunucuyu yeniden başlatın"
   },
+  "newSessionForm": {
+    "open": "Yeni oturum",
+    "sessionNamePlaceholder": "Oturum adı (harf ve rakamlar, ör. benim-ozelligim)",
+    "workingDirectoryPlaceholder": "Çalışma klasörü (ör. ~/workspace/projem veya mutlak yol)",
+    "cancel": "İptal",
+    "creating": "Oluşturuluyor…",
+    "create": "Oluştur",
+    "errors": {
+      "towerUnavailable": "Kontrol kulesi çalışmıyor — oturum oluşturulamıyor",
+      "nameConflict": "Bu ada sahip bir oturum zaten var",
+      "createFailed": "Oturum oluşturulamadı"
+    }
+  },
   "search": {
     "modeProjects": "Projeler",
     "modeConversations": "Konuşmalar",