Fix search/nav button offline behavior

lib/screens/coordinators/navigation_coordinator.dart

@@ -80,12 +80,12 @@ class NavigationCoordinator {
   }) {
     final appState = context.read<AppState>();
     
-    if (appState.isInRouteMode) {
-      // Show route overview (zoom out to show full route)
+    if (appState.showRouteButton) {
+      // Route button - show route overview and zoom to show route
       appState.showRouteOverview();
       zoomToShowFullRoute(appState: appState, mapController: mapController);
     } else {
-      // Not in route - handle based on current state
+      // Search button - toggle search mode
       if (appState.isInSearchMode) {
         // Exit search mode
         appState.clearSearchResults();

lib/widgets/map/map_overlays.dart

@@ -159,7 +159,7 @@ class MapOverlays extends StatelessWidget {
                 children: [
                   // Search/Navigation button - show search button always, show route button only in dev mode when online
                   if (onSearchPressed != null) ...[
-                    if (appState.showSearchButton || (enableNavigationFeatures(offlineMode: appState.offlineMode) && appState.showRouteButton)) ...[
+                    if ((!appState.offlineMode && appState.showSearchButton) || appState.showRouteButton) ...[
                       FloatingActionButton(
                         mini: true,
                         heroTag: "search_nav",