refactor: Use dynamic color package instead of system theme

lib/widgets/theme_builder.dart

@@ -1,12 +1,9 @@
 import 'package:flutter/material.dart';
 
 import 'package:collection/collection.dart';
+import 'package:dynamic_color/dynamic_color.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:system_theme/system_theme.dart';
-
-import 'package:fluffychat/config/app_config.dart';
-import 'package:fluffychat/utils/platform_infos.dart';
 
 class ThemeBuilder extends StatefulWidget {
   final Widget Function(
@@ -89,28 +86,16 @@ class ThemeController extends State<ThemeBuilder> {
     super.initState();
   }
 
-  Color get systemAccentColor {
-    if (PlatformInfos.isLinux) return AppConfig.chatColor;
-    try {
-      // a bad plugin implementation
-      // https://github.com/bdlukaa/system_theme/issues/10
-      final accentColor = SystemTheme.accentColor;
-      final color = accentColor.accent;
-      return color;
-    } catch (_) {
-      return AppConfig.chatColor;
-    }
-  }
-
   @override
   Widget build(BuildContext context) {
     return Provider(
       create: (_) => this,
-      child: widget.builder(
-        context,
-        themeMode,
-        primaryColor ?? systemAccentColor,
-      ),
+      child: DynamicColorBuilder(
+          builder: (light, _) => widget.builder(
+                context,
+                themeMode,
+                primaryColor ?? light?.primary,
+              )),
     );
   }
 }