fix(ui): Adjust bottom nav padding, fix router scroll, keep session on PWA, and add ETA loading state

frontend/src/router/index.ts

@@ -5,6 +5,13 @@ import { useAuthStore } from '@/stores/auth'
 
 const router = createRouter({
     history: createWebHistory(import.meta.env.BASE_URL),
+    scrollBehavior(_to, _from, savedPosition) {
+        if (savedPosition) {
+            return savedPosition;
+        } else {
+            return { top: 0 };
+        }
+    },
     routes: [
         // ─── Vistas Públicas Core ───────────────────────────────────────────
         {