Added pre-travel screen; added country polygons for maps

src/App.jsx

@@ -1,8 +1,9 @@
-import React, { useState } from 'react'
+import { useState } from 'react'
 import Sidebar from './components/Sidebar.jsx'
 import Dashboard from './components/Dashboard.jsx'
 import LiveTracking from './components/LiveTracking.jsx'
-
+import Trips from './components/Trips.jsx'
+import PreTravel from './components/PreTravel.jsx'
 /**
  * App — root layout component.
  * Implements a two-panel CSS Grid: fixed sidebar + scrollable main viewport.
@@ -14,6 +15,8 @@ export default function App() {
   function renderPage() {
     switch (activePage) {
       case 'live-tracking': return <LiveTracking />
+      case 'trips': return <Trips />
+      case 'pre-travel': return <PreTravel />
       default: return <Dashboard />
     }
   }