feat: use noto sans sc as default font; fix build script on arm64 linux.

app/lib/constants/constants.dart

@@ -21,6 +21,8 @@ const double defaultButtonHeight = 36;
 
 const userGestureConfigFilePath = 'deepin/dde-daemon/gesture.json';
 
+const defaultFontFamily = 'NotoSansSC';
+
 const deepinLogoutCommands = [
   'dbus-send',
   '--type=method_call',

app/lib/themes/dark.dart

@@ -1,7 +1,13 @@
-import 'package:flutter/material.dart';
 import 'package:dde_gesture_manager/constants/constants.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
 
-var darkTheme = ThemeData.dark().copyWith(
+final _darkTheme = ThemeData(
+  brightness: Brightness.dark,
+  fontFamily: kIsWeb ? null : defaultFontFamily,
+);
+
+var darkTheme = _darkTheme.copyWith(
   primaryColor: Colors.grey,
   scaffoldBackgroundColor: Color(0xff252525),
   backgroundColor: Color(0xff282828),
@@ -9,21 +15,23 @@ var darkTheme = ThemeData.dark().copyWith(
     color: Color(0xffc0c6d4),
   ),
   dividerColor: Color(0xfff3f3f3),
-  textTheme: ThemeData.dark().textTheme.copyWith(
+  textTheme: _darkTheme.textTheme.copyWith(
         headline1: TextStyle(
           color: Color(0xffc0c6d4),
+          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
         ),
         bodyText2: TextStyle(
           color: Color(0xffc0c6d4),
+          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
         ),
       ),
-  popupMenuTheme: ThemeData.dark().popupMenuTheme.copyWith(
+  popupMenuTheme: _darkTheme.popupMenuTheme.copyWith(
         shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.circular(defaultBorderRadius),
         ),
       ),
   dialogBackgroundColor: Color(0xff202020),
-  tooltipTheme: ThemeData.dark().tooltipTheme.copyWith(
+  tooltipTheme: _darkTheme.tooltipTheme.copyWith(
         textStyle: TextStyle(
           color: Colors.grey,
         ),

app/lib/themes/light.dart

@@ -1,7 +1,13 @@
 import 'package:dde_gesture_manager/constants/constants.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
-var lightTheme = ThemeData.light().copyWith(
+final _lightTheme = ThemeData(
+  brightness: Brightness.light,
+  fontFamily: kIsWeb ? null : defaultFontFamily,
+);
+
+var lightTheme = _lightTheme.copyWith(
   primaryColor: Colors.blue,
   scaffoldBackgroundColor: Color(0xfff8f8f8),
   backgroundColor: Color(0xffffffff),
@@ -9,21 +15,23 @@ var lightTheme = ThemeData.light().copyWith(
     color: Color(0xff414d68),
   ),
   dividerColor: Colors.grey.shade600,
-  textTheme: ThemeData.light().textTheme.copyWith(
+  textTheme: _lightTheme.textTheme.copyWith(
         headline1: TextStyle(
           color: Color(0xff414d68),
+          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
         ),
         bodyText2: TextStyle(
           color: Color(0xff414d68),
+          fontFamilyFallback: kIsWeb ? null : [defaultFontFamily],
         ),
       ),
-  popupMenuTheme: ThemeData.dark().popupMenuTheme.copyWith(
+  popupMenuTheme: _lightTheme.popupMenuTheme.copyWith(
         shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.circular(defaultBorderRadius),
         ),
       ),
   dialogBackgroundColor: Color(0xfffefefe),
-  tooltipTheme: ThemeData.dark().tooltipTheme.copyWith(
+  tooltipTheme: _lightTheme.tooltipTheme.copyWith(
         textStyle: TextStyle(
           color: Colors.grey.shade600,
         ),