Build Routes tab with paginated list and Zod-validated API responses

Routes tab (Phase 3.1):
- Paginated FlatList fetching from Journal REST API
- Route cards with name, distance (km), elevation gain, day count
- Pull-to-refresh, loading spinner, error state with retry, empty state
- Safe area insets for notch and tab bar

API client:
- Import types from @trails-cool/api instead of hand-written interfaces
- Parse list/detail responses through Zod schemas at runtime
- Add zod as mobile app dependency

i18n:
- Add mobile namespace (en + de) for routes, activities, profile, login

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/i18n/src/index.ts

@@ -10,8 +10,8 @@ export const supportedLngs = ["en", "de"] as const;
 export type SupportedLng = (typeof supportedLngs)[number];
 
 export const resources = {
-  en: { common: en.common, planner: en.planner, journal: en.journal },
-  de: { common: de.common, planner: de.planner, journal: de.journal },
+  en: { common: en.common, planner: en.planner, journal: en.journal, mobile: en.mobile },
+  de: { common: de.common, planner: de.planner, journal: de.journal, mobile: de.mobile },
 } as const;
 
 const commonOptions = {

packages/i18n/src/locales/de.ts

@@ -274,4 +274,26 @@ export default {
       registerWithMagicLink: "Per Magic Link registrieren",
     },
   },
+  mobile: {
+    routes: {
+      empty: "Noch keine Routen",
+      emptyHint: "Erstelle deine erste Route im Planner",
+      retry: "Erneut versuchen",
+    },
+    activities: {
+      empty: "Noch keine Aktivitäten",
+      emptyHint: "Zeichne deine erste Aktivität auf oder importiere sie",
+    },
+    profile: {
+      logOut: "Abmelden",
+      switchServer: "Server wechseln",
+      switchServerConfirm: "Du wirst abgemeldet und lokale Daten werden gelöscht. Fortfahren?",
+    },
+    login: {
+      subtitle: "Bei deinem Journal anmelden",
+      signIn: "Anmelden",
+      connectDifferentServer: "Mit anderem Server verbinden",
+      serverUrl: "Server-URL",
+    },
+  },
 } as const;

packages/i18n/src/locales/en.ts

@@ -274,4 +274,26 @@ export default {
       registerWithMagicLink: "Register with Magic Link",
     },
   },
+  mobile: {
+    routes: {
+      empty: "No routes yet",
+      emptyHint: "Create your first route in the Planner",
+      retry: "Retry",
+    },
+    activities: {
+      empty: "No activities yet",
+      emptyHint: "Record or import your first activity",
+    },
+    profile: {
+      logOut: "Log Out",
+      switchServer: "Switch Server",
+      switchServerConfirm: "This will log you out and clear local data. Continue?",
+    },
+    login: {
+      subtitle: "Sign in to your Journal",
+      signIn: "Sign In",
+      connectDifferentServer: "Connect to a different server",
+      serverUrl: "Server URL",
+    },
+  },
 } as const;