fix(dashboard): show an error instead of a blank trip list when the server is unreachable (#1283)

When the backend or identity provider was unreachable, a returning user with a
persisted session landed on the dashboard with an empty trip grid and no error.
That looks identical to a logged-in user who simply has no trips, so people
assumed their data had been lost.

Three client-side layers were quietly swallowing the failure: the auth check
only cleared state on a 401, so a 5xx or a network error left the stale session
in place and kept rendering the protected route; the offline-first trip repo
turned a failed fetch into the empty cache without throwing; and the dashboard
had neither an error nor an empty state, so a blank grid meant both "outage" and
"no trips".

The auth check now tells genuine offline (keep serving the cache silently, the
PWA happy path) apart from a server outage while online (keep the session but
flag it). The dashboard shows a reassuring "couldn't reach the server, your
trips are safe" banner with a retry, and a real zero-trip account finally gets a
proper empty state so the two cases never look alike. New strings added across
all locales.

shared/src/i18n/ar/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'منتهية',
   'dashboard.status.daysLeft': 'متبقي {count} يوم',
   'dashboard.toast.loadError': 'فشل تحميل الرحلات',
+  'dashboard.loadErrorBanner': 'تعذّر الوصول إلى الخادم. رحلاتك في أمان — يرجى المحاولة مرة أخرى.',
+  'dashboard.retry': 'إعادة المحاولة',
   'dashboard.toast.created': 'تم إنشاء الرحلة بنجاح',
   'dashboard.toast.createError': 'فشل إنشاء الرحلة',
   'dashboard.toast.updated': 'تم تحديث الرحلة',

shared/src/i18n/br/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Passada',
   'dashboard.status.daysLeft': 'Faltam {count} dias',
   'dashboard.toast.loadError': 'Não foi possível carregar as viagens',
+  'dashboard.loadErrorBanner': 'Não foi possível conectar ao servidor. Suas viagens estão seguras — tente novamente.',
+  'dashboard.retry': 'Tentar novamente',
   'dashboard.toast.created': 'Viagem criada com sucesso!',
   'dashboard.toast.createError': 'Não foi possível criar a viagem',
   'dashboard.toast.updated': 'Viagem atualizada!',

shared/src/i18n/cs/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Proběhlé',
   'dashboard.status.daysLeft': 'zbývá {count} dní',
   'dashboard.toast.loadError': 'Nepodařilo se načíst cesty',
+  'dashboard.loadErrorBanner': 'Server nebyl dostupný. Vaše cesty jsou v bezpečí — zkuste to prosím znovu.',
+  'dashboard.retry': 'Zkusit znovu',
   'dashboard.toast.created': 'Cesta byla úspěšně vytvořena!',
   'dashboard.toast.createError': 'Nepodařilo se vytvořit cestu',
   'dashboard.toast.updated': 'Cesta byla aktualizována!',

shared/src/i18n/de/dashboard.ts

@@ -43,6 +43,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Vergangen',
   'dashboard.status.daysLeft': 'Noch {count} Tage',
   'dashboard.toast.loadError': 'Fehler beim Laden der Reisen',
+  'dashboard.loadErrorBanner': 'Server nicht erreichbar. Deine Reisen sind sicher — bitte versuche es erneut.',
+  'dashboard.retry': 'Erneut versuchen',
   'dashboard.toast.created': 'Reise erfolgreich erstellt!',
   'dashboard.toast.createError': 'Fehler beim Erstellen',
   'dashboard.toast.updated': 'Reise aktualisiert!',

shared/src/i18n/en/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Past',
   'dashboard.status.daysLeft': '{count} days left',
   'dashboard.toast.loadError': 'Failed to load trips',
+  'dashboard.loadErrorBanner': "Couldn't reach the server. Your trips are safe — please try again.",
+  'dashboard.retry': 'Retry',
   'dashboard.toast.created': 'Trip created successfully!',
   'dashboard.toast.createError': 'Failed to create trip',
   'dashboard.toast.updated': 'Trip updated!',

shared/src/i18n/es/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Pasado',
   'dashboard.status.daysLeft': 'Quedan {count} días',
   'dashboard.toast.loadError': 'No se pudieron cargar los viajes',
+  'dashboard.loadErrorBanner': 'No se pudo conectar con el servidor. Tus viajes están a salvo: inténtalo de nuevo.',
+  'dashboard.retry': 'Reintentar',
   'dashboard.toast.created': '¡Viaje creado correctamente!',
   'dashboard.toast.createError': 'No se pudo crear el viaje',
   'dashboard.toast.updated': '¡Viaje actualizado!',

shared/src/i18n/fr/dashboard.ts

@@ -42,6 +42,9 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Passé',
   'dashboard.status.daysLeft': '{count} jours restants',
   'dashboard.toast.loadError': 'Impossible de charger les voyages',
+  'dashboard.loadErrorBanner':
+    "Impossible de joindre le serveur. Vos voyages sont en sécurité — veuillez réessayer.",
+  'dashboard.retry': 'Réessayer',
   'dashboard.toast.created': 'Voyage créé avec succès !',
   'dashboard.toast.createError': 'Impossible de créer le voyage',
   'dashboard.toast.updated': 'Voyage mis à jour !',

shared/src/i18n/gr/dashboard.ts

@@ -41,6 +41,9 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Παρελθόν',
   'dashboard.status.daysLeft': '{count} μέρες έμειναν',
   'dashboard.toast.loadError': 'Αποτυχία φόρτωσης ταξιδιών',
+  'dashboard.loadErrorBanner':
+    'Δεν ήταν δυνατή η σύνδεση με τον διακομιστή. Τα ταξίδια σας είναι ασφαλή — δοκιμάστε ξανά.',
+  'dashboard.retry': 'Δοκιμάστε ξανά',
   'dashboard.toast.created': 'Ταξίδι δημιουργήθηκε επιτυχώς!',
   'dashboard.toast.createError': 'Αποτυχία δημιουργίας ταξιδιού',
   'dashboard.toast.updated': 'Ταξίδι ενημερώθηκε!',

shared/src/i18n/hu/dashboard.ts

@@ -43,6 +43,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Múlt',
   'dashboard.status.daysLeft': 'Még {count} nap',
   'dashboard.toast.loadError': 'Nem sikerült betölteni az utazásokat',
+  'dashboard.loadErrorBanner': 'Nem sikerült elérni a kiszolgálót. Az utazásaid biztonságban vannak — kérlek, próbáld újra.',
+  'dashboard.retry': 'Újra',
   'dashboard.toast.created': 'Utazás sikeresen létrehozva!',
   'dashboard.toast.createError': 'Nem sikerült létrehozni',
   'dashboard.toast.updated': 'Utazás frissítve!',

shared/src/i18n/id/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Sudah lewat',
   'dashboard.status.daysLeft': '{count} hari lagi',
   'dashboard.toast.loadError': 'Gagal memuat perjalanan',
+  'dashboard.loadErrorBanner': 'Tidak dapat terhubung ke server. Perjalananmu aman — silakan coba lagi.',
+  'dashboard.retry': 'Coba lagi',
   'dashboard.toast.created': 'Perjalanan berhasil dibuat!',
   'dashboard.toast.createError': 'Gagal membuat perjalanan',
   'dashboard.toast.updated': 'Perjalanan diperbarui!',

shared/src/i18n/it/dashboard.ts

@@ -42,6 +42,9 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Passato',
   'dashboard.status.daysLeft': '-{count} giorni',
   'dashboard.toast.loadError': 'Impossibile caricare i viaggi',
+  'dashboard.loadErrorBanner':
+    "Impossibile raggiungere il server. I tuoi viaggi sono al sicuro — riprova.",
+  'dashboard.retry': 'Riprova',
   'dashboard.toast.created': 'Viaggio creato con successo!',
   'dashboard.toast.createError': 'Impossibile creare il viaggio',
   'dashboard.toast.updated': 'Viaggio aggiornato!',

shared/src/i18n/ja/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': '過去',
   'dashboard.status.daysLeft': '残り{count}日',
   'dashboard.toast.loadError': '旅行の読み込みに失敗しました',
+  'dashboard.loadErrorBanner': 'サーバーに接続できませんでした。旅行のデータは安全に保存されています — もう一度お試しください。',
+  'dashboard.retry': '再試行',
   'dashboard.toast.created': '旅行を作成しました！',
   'dashboard.toast.createError': '旅行の作成に失敗しました',
   'dashboard.toast.updated': '旅行を更新しました！',

shared/src/i18n/ko/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': '지난 여행',
   'dashboard.status.daysLeft': '{count}일 남음',
   'dashboard.toast.loadError': '여행 불러오기 실패',
+  'dashboard.loadErrorBanner': '서버에 연결할 수 없습니다. 여행 정보는 안전하게 보관되어 있으니 잠시 후 다시 시도해 주세요.',
+  'dashboard.retry': '다시 시도',
   'dashboard.toast.created': '여행이 생성되었습니다!',
   'dashboard.toast.createError': '여행 생성 실패',
   'dashboard.toast.updated': '여행이 업데이트되었습니다!',

shared/src/i18n/nl/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Afgelopen',
   'dashboard.status.daysLeft': 'nog {count} dagen',
   'dashboard.toast.loadError': 'Reizen laden mislukt',
+  'dashboard.loadErrorBanner': 'De server is niet bereikbaar. Je reizen zijn veilig — probeer het opnieuw.',
+  'dashboard.retry': 'Opnieuw proberen',
   'dashboard.toast.created': 'Reis aangemaakt!',
   'dashboard.toast.createError': 'Reis aanmaken mislukt',
   'dashboard.toast.updated': 'Reis bijgewerkt!',

shared/src/i18n/pl/dashboard.ts

@@ -39,6 +39,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Zakończona',
   'dashboard.status.daysLeft': '{count} dni do końca',
   'dashboard.toast.loadError': 'Nie udało się załadować podróży',
+  'dashboard.loadErrorBanner': 'Nie udało się połączyć z serwerem. Twoje podróże są bezpieczne — spróbuj ponownie.',
+  'dashboard.retry': 'Spróbuj ponownie',
   'dashboard.toast.created': 'Podróż została utworzona pomyślnie!',
   'dashboard.toast.createError': 'Nie udało się utworzyć podróży',
   'dashboard.toast.updated': 'Podróż została zaktualizowana!',

shared/src/i18n/ru/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Прошло',
   'dashboard.status.daysLeft': 'осталось {count} дн.',
   'dashboard.toast.loadError': 'Не удалось загрузить поездки',
+  'dashboard.loadErrorBanner': 'Не удалось подключиться к серверу. Ваши поездки в безопасности — попробуйте снова.',
+  'dashboard.retry': 'Повторить',
   'dashboard.toast.created': 'Поездка создана!',
   'dashboard.toast.createError': 'Не удалось создать поездку',
   'dashboard.toast.updated': 'Поездка обновлена!',

shared/src/i18n/tr/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Geçmiş',
   'dashboard.status.daysLeft': '{count} gün kaldı',
   'dashboard.toast.loadError': 'Seyahatler yüklenemedi',
+  'dashboard.loadErrorBanner': 'Sunucuya ulaşılamadı. Seyahatleriniz güvende — lütfen tekrar deneyin.',
+  'dashboard.retry': 'Tekrar dene',
   'dashboard.toast.created': 'Seyahat oluşturuldu!',
   'dashboard.toast.createError': 'Seyahat oluşturulamadı',
   'dashboard.toast.updated': 'Seyahat güncellendi!',

shared/src/i18n/uk/dashboard.ts

@@ -42,6 +42,9 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': 'Минуло',
   'dashboard.status.daysLeft': 'залишилось {count} дн.',
   'dashboard.toast.loadError': 'Не вдалося завантажити поїздки',
+  'dashboard.loadErrorBanner':
+    "Не вдалося з'єднатися із сервером. Ваші поїздки в безпеці — будь ласка, спробуйте ще раз.",
+  'dashboard.retry': 'Спробувати ще раз',
   'dashboard.toast.created': 'Поїздка створена!',
   'dashboard.toast.createError': 'Не вдалося створити поїздку',
   'dashboard.toast.updated': 'Поїздка оновлена!',

shared/src/i18n/zh-TW/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': '已結束',
   'dashboard.status.daysLeft': '還剩 {count} 天',
   'dashboard.toast.loadError': '載入旅行失敗',
+  'dashboard.loadErrorBanner': '無法連線到伺服器。你的旅行資料安全無虞——請稍後再試。',
+  'dashboard.retry': '重試',
   'dashboard.toast.created': '旅行建立成功！',
   'dashboard.toast.createError': '建立旅行失敗',
   'dashboard.toast.updated': '旅行已更新！',

shared/src/i18n/zh/dashboard.ts

@@ -42,6 +42,8 @@ const dashboard: TranslationStrings = {
   'dashboard.status.past': '已结束',
   'dashboard.status.daysLeft': '还剩 {count} 天',
   'dashboard.toast.loadError': '加载旅行失败',
+  'dashboard.loadErrorBanner': '无法连接到服务器。你的旅行数据安然无恙——请稍后重试。',
+  'dashboard.retry': '重试',
   'dashboard.toast.created': '旅行创建成功！',
   'dashboard.toast.createError': '创建旅行失败',
   'dashboard.toast.updated': '旅行已更新！',