[main] Fix ticker provider regression

Also adds regression test. It's unclear why I thought this worked. I appear to have changed this deliberately in 9525483 and remember doing some testing.

lib/main.dart

@@ -637,7 +637,7 @@ class _Panel extends StatefulWidget {
   _PanelState createState() => _PanelState();
 }
 
-class _PanelState extends State<_Panel> with SingleTickerProviderStateMixin {
+class _PanelState extends State<_Panel> with TickerProviderStateMixin {
   late TabController tabController;
   // This is needed to persist plot panel state between states with different
   // available tabs, such as between station selections with and without

lib/widgets/map.dart

@@ -60,6 +60,7 @@ class MapController extends Controller {
     super.dispose();
   }
 
+  /// [mayUnlock]: Whether this operation may unlock camera tracking.
   void selectStation(Station? station, {bool mayUnlock = true}) => setState(() {
         selectedStation.value = station;
 

test/widget_test.dart

@@ -186,6 +186,23 @@ void main() {
       await tester.pump(Duration.zero);
     });
 
+    testWidgets(
+        'can select a station without an associated tide/current station',
+        (tester) async {
+      await tester.pumpWidget(harness.buildTripPlanner());
+      await tester.flushAsync();
+      await tester.pumpAndSettle();
+
+      final TripPlannerState state = tester.state(find.byType(TripPlanner));
+      state.mapController.selectStation(kDatapoints.values.firstWhere(
+          (station) =>
+              !station.type.isTideCurrent &&
+              station.tideCurrentStationId == null));
+      await tester.pump();
+
+      expect(find.text('Tides'), findsNothing);
+    });
+
     group('in portrait layout', () {
       setUp(() {
         final window = TestWidgetsFlutterBinding.instance.window;