Przebudowanie aplikacji, usprawnione AI, dodanie combo buildera

lib/core/constants/ui_constants.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:trainhub_flutter/core/theme/app_colors.dart';
 
 class UIConstants {
   UIConstants._();
@@ -29,4 +30,9 @@ class UIConstants {
 
   static BorderRadius get smallCardBorderRadius =>
       BorderRadius.circular(smallBorderRadius);
+
+  /// Soft red glow behind primary accents (CTA buttons, active timers).
+  static List<BoxShadow> get accentGlow => const [
+    BoxShadow(color: AppColors.accentGlow, blurRadius: 24, spreadRadius: 1),
+  ];
 }