[app] Add summary to theme color preference

app/src/main/res/values-zh-rCN/strings.xml

@@ -186,4 +186,5 @@
     <string name="info_system_version">系统版本</string>
     <string name="info_device">设备</string>
     <string name="info_system_abi">系统架构</string>
+    <string name="theme_color_summary">应用中最常见的颜色</string>
 </resources>

app/src/main/res/values/dimens.xml

@@ -21,4 +21,5 @@
 <resources>
     <dimen name="app_icon_size">48dp</dimen>
     <dimen name="tab_layout_height">48dp</dimen>
+    <dimen name="colorpickerpreference_widget_size">32dp</dimen>
 </resources>

app/src/main/res/values/strings.xml

@@ -150,6 +150,7 @@
     <string name="dns_over_http">DNS over HTTPS</string>
     <string name="dns_over_http_summary">Workaround DNS poisoning in some nations</string>
     <string name="theme_color">Theme color</string>
+    <string name="theme_color_summary">Color that appears most frequently in the app</string>
 
     <!-- Module Repo -->
     <string name="module_readme">Readme</string>

app/src/main/res/xml/prefs.xml

@@ -37,6 +37,7 @@
             android:dialogTitle="@string/theme_color"
             android:key="theme_color"
             android:title="@string/theme_color"
+            android:summary="@string/theme_color_summary"
             android:icon="@drawable/ic_outline_palette_24" />
         <rikka.preference.SimpleMenuPreference
             android:defaultValue="MODE_NIGHT_FOLLOW_SYSTEM"
@@ -75,7 +76,7 @@
         android:key="group_backup"
         android:title="@string/settings_backup_and_restore"
         android:summary="@string/settings_backup_and_restore_summery"
-        android:icon="@drawable/ic_baseline_settings_backup_restore_24" >
+        android:icon="@drawable/ic_baseline_settings_backup_restore_24">
         <Preference
             android:key="backup"
             android:title="@string/settings_backup" />