feat: implement splash and onboarding flows, update app assets, and add project design documentation

apps/driver/trip_overlay_plugin/test/trip_overlay_plugin_method_channel_test.dart

@@ -1,27 +1,5 @@
-import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:trip_overlay_plugin/trip_overlay_plugin_method_channel.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
-
-  MethodChannelTripOverlayPlugin platform = MethodChannelTripOverlayPlugin();
-  const MethodChannel channel = MethodChannel('trip_overlay_plugin');
-
-  setUp(() {
-    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(
-      channel,
-      (MethodCall methodCall) async {
-        return '42';
-      },
-    );
-  });
-
-  tearDown(() {
-    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger.setMockMethodCallHandler(channel, null);
-  });
-
-  test('getPlatformVersion', () async {
-    expect(await platform.getPlatformVersion(), '42');
-  });
 }

apps/driver/trip_overlay_plugin/test/trip_overlay_plugin_test.dart

@@ -7,9 +7,6 @@ import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 class MockTripOverlayPluginPlatform
     with MockPlatformInterfaceMixin
     implements TripOverlayPluginPlatform {
-
-  @override
-  Future<String?> getPlatformVersion() => Future.value('42');
 }
 
 void main() {
@@ -19,11 +16,5 @@ void main() {
     expect(initialPlatform, isInstanceOf<MethodChannelTripOverlayPlugin>());
   });
 
-  test('getPlatformVersion', () async {
-    TripOverlayPlugin tripOverlayPlugin = TripOverlayPlugin();
-    MockTripOverlayPluginPlatform fakePlatform = MockTripOverlayPluginPlatform();
-    TripOverlayPluginPlatform.instance = fakePlatform;
 
-    expect(await tripOverlayPlugin.getPlatformVersion(), '42');
-  });
 }