feat: remove google font and add quicksand

lib/core/constants/theme.dart

@@ -1,6 +1,6 @@
+import 'package:enaklo_pos/core/assets/fonts.gen.dart';
 import 'package:enaklo_pos/core/constants/colors.dart';
 import 'package:flutter/material.dart';
-import 'package:google_fonts/google_fonts.dart';
 
 ThemeData getApplicationTheme = ThemeData(
   primaryColor: AppColors.primary,
@@ -8,7 +8,7 @@ ThemeData getApplicationTheme = ThemeData(
   appBarTheme: AppBarTheme(
     color: AppColors.white,
     elevation: 0,
-    titleTextStyle: GoogleFonts.quicksand(
+    titleTextStyle: TextStyle(
       color: AppColors.primary,
       fontSize: 16.0,
       fontWeight: FontWeight.w500,
@@ -17,7 +17,7 @@ ThemeData getApplicationTheme = ThemeData(
       color: AppColors.primary,
     ),
   ),
-  fontFamily: GoogleFonts.quicksand().fontFamily,
+  fontFamily: FontFamily.quicksand,
   colorScheme: ColorScheme.fromSeed(seedColor: AppColors.primary),
   useMaterial3: true,
   inputDecorationTheme: InputDecorationTheme(