renderer: add theme switcher, go to about page button in main screen

src/renderer/components/screen/MainScreen.vue

@@ -1,4 +1,22 @@
 <script setup>
+// import { useI18n } from 'vue-i18n'
+import { useTheme } from 'vuetify'
+import Utils from '../../assets/js/utils'
+
+// const { locale } = useI18n()
+const theme = useTheme()
+
+const handleChangeTheme = () => {
+  theme.global.name.value = theme.global.current.value.dark ? 'light' : 'dark'
+}
+
+const handleChangeLanguage = () => {
+  // locale.value = 'en' // TODO
+}
+
+const handleAbout = async () => {
+  await Utils.openExternal('https://github.com/jooy2/vutron')
+}
 </script>
 
 <template>
@@ -17,6 +35,34 @@
       <v-col cols="12">
         {{ $t('desc.welcome') }}
       </v-col>
+      <v-col cols="4">
+        <v-btn
+          block
+          color="primary"
+          @click="handleChangeTheme"
+        >
+          {{ $t('menu.change-theme') }}
+        </v-btn>
+      </v-col>
+      <v-col cols="4">
+        <v-btn
+          block
+          disabled
+          color="primary"
+          @click="handleChangeLanguage"
+        >
+          {{ $t('menu.change-language') }}
+        </v-btn>
+      </v-col>
+      <v-col cols="4">
+        <v-btn
+          block
+          color="primary"
+          @click="handleAbout"
+        >
+          {{ $t('menu.about') }}
+        </v-btn>
+      </v-col>
     </v-row>
   </v-container>
 </template>