Add themes and drawing field for kanji

lib/screens/home.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:tangocard_reader/service/tangocard_files.dart';
+import 'package:tangocard_reader/service/theme_bloc.dart';
 
 import 'pages/tango_set_list.dart';
 
@@ -14,14 +15,31 @@ class _HomeState extends State<Home> {
   int page = 0;
 
   final _pages = [
-    TangoSetList(files: tangocardFilePaths, route: '/list/tango',),
-    TangoSetList(files: kanjicardFilePaths, route: '/list/kanji',),
+    TangoSetList(
+      files: tangocardFilePaths,
+      route: '/list/tango',
+    ),
+    TangoSetList(
+      files: kanjicardFilePaths,
+      route: '/list/kanji',
+    ),
   ];
 
   @override
   Widget build(BuildContext context) => Scaffold(
         appBar: AppBar(
           title: const Text("よく単語"),
+          actions: [
+            BlocBuilder<ThemeBloc, Brightness>(
+              builder: (context, state) {
+                return Switch(
+                  value: state == Brightness.dark,
+                  onChanged: (b) => BlocProvider.of<ThemeBloc>(context)
+                      .add(SetTheme(state != Brightness.dark)),
+                );
+              },
+            )
+          ],
           centerTitle: true,
         ),
         body: _pages[page],
@@ -29,8 +47,8 @@ class _HomeState extends State<Home> {
           onTap: (int index) => setState(() => page = index),
           currentIndex: page,
           items: const [
-            BottomNavigationBarItem(label: 'Tango', icon: Icon(Icons.style)),
-            BottomNavigationBarItem(label: 'Kanji', icon: Text('漢字')),
+            BottomNavigationBarItem(label: '単語', icon: Icon(Icons.style)),
+            BottomNavigationBarItem(label: '漢字', icon: Icon(Icons.translate)),
           ],
         ),
       );