Linux build system correction. New visual treatment

Co-authored-by: Copilot <copilot@github.com>

lib/app_theme_business_object.dart

@@ -3,6 +3,12 @@ import 'package:flutter/material.dart';
 class AppThemeColors {
   const AppThemeColors({
     required this.primarySeed,
+    required this.secondarySeed,
+    required this.scaffoldGradientStart,
+    required this.scaffoldGradientEnd,
+    required this.shellSurface,
+    required this.shellBorder,
+    required this.accent,
     required this.webViewBorder,
     required this.webViewBackground,
     required this.controlsGradientStart,
@@ -12,6 +18,12 @@ class AppThemeColors {
   });
 
   final Color primarySeed;
+  final Color secondarySeed;
+  final Color scaffoldGradientStart;
+  final Color scaffoldGradientEnd;
+  final Color shellSurface;
+  final Color shellBorder;
+  final Color accent;
   final Color webViewBorder;
   final Color webViewBackground;
   final Color controlsGradientStart;
@@ -22,23 +34,35 @@ class AppThemeColors {
 
 class AppThemeBusinessObject {
   static const AppThemeColors lightColors = AppThemeColors(
-    primarySeed: Color(0xFF607D8B),
-    webViewBorder: Color(0x42000000),
+    primarySeed: Color(0xFFE36A18),
+    secondarySeed: Color(0xFF1663C7),
+    scaffoldGradientStart: Color(0xFFFFF3E3),
+    scaffoldGradientEnd: Color(0xFFE6F2FF),
+    shellSurface: Color(0xF7FFFFFF),
+    shellBorder: Color(0x1A1A4D86),
+    accent: Color(0xFF0F5DB6),
+    webViewBorder: Color(0x261A4D86),
     webViewBackground: Color(0xFFFFFFFF),
-    controlsGradientStart: Color(0xFFE1F5FE),
-    controlsGradientEnd: Color(0xFFB3E5FC),
-    controlsShadow: Color(0x22000000),
-    statusText: Color(0xDD000000),
+    controlsGradientStart: Color(0xFFFFB465),
+    controlsGradientEnd: Color(0xFF69ADFF),
+    controlsShadow: Color(0x24114B7A),
+    statusText: Color(0xFF13243D),
   );
 
   static const AppThemeColors darkColors = AppThemeColors(
-    primarySeed: Color(0xFF37474F),
-    webViewBorder: Color(0x66FFFFFF),
-    webViewBackground: Color(0xFF0F1417),
-    controlsGradientStart: Color(0xFF1B2731),
-    controlsGradientEnd: Color(0xFF233744),
+    primarySeed: Color(0xFFFF9D59),
+    secondarySeed: Color(0xFF76B8FF),
+    scaffoldGradientStart: Color(0xFF0F1C30),
+    scaffoldGradientEnd: Color(0xFF31190C),
+    shellSurface: Color(0xD9162438),
+    shellBorder: Color(0x3366AAFF),
+    accent: Color(0xFFFFBC7E),
+    webViewBorder: Color(0x3378B7FF),
+    webViewBackground: Color(0xFF0C1420),
+    controlsGradientStart: Color(0xFF275792),
+    controlsGradientEnd: Color(0xFF9A4F1F),
     controlsShadow: Color(0x44000000),
-    statusText: Color(0xE6FFFFFF),
+    statusText: Color(0xFFF4F7FF),
   );
 
   static bool isDarkMode(BuildContext context) {
@@ -50,19 +74,62 @@ class AppThemeBusinessObject {
   }
 
   static ThemeData lightTheme() {
+    final ColorScheme scheme =
+        ColorScheme.fromSeed(
+          seedColor: lightColors.primarySeed,
+          brightness: Brightness.light,
+        ).copyWith(
+          primary: lightColors.primarySeed,
+          secondary: lightColors.secondarySeed,
+          tertiary: const Color(0xFF2C85E1),
+          surface: const Color(0xFFFFFBF7),
+          onSurface: lightColors.statusText,
+        );
+
     return ThemeData(
-      colorScheme: ColorScheme.fromSeed(seedColor: lightColors.primarySeed),
       useMaterial3: true,
+      colorScheme: scheme,
+      scaffoldBackgroundColor: scheme.surface,
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: scheme.primary,
+          foregroundColor: scheme.onPrimary,
+          padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+        ),
+      ),
     );
   }
 
   static ThemeData darkTheme() {
+    final ColorScheme scheme =
+        ColorScheme.fromSeed(
+          seedColor: darkColors.primarySeed,
+          brightness: Brightness.dark,
+        ).copyWith(
+          primary: darkColors.primarySeed,
+          secondary: darkColors.secondarySeed,
+          tertiary: const Color(0xFF4E97E8),
+          surface: const Color(0xFF111A27),
+          onSurface: darkColors.statusText,
+        );
+
     return ThemeData(
-      colorScheme: ColorScheme.fromSeed(
-        seedColor: darkColors.primarySeed,
-        brightness: Brightness.dark,
-      ),
       useMaterial3: true,
+      colorScheme: scheme,
+      scaffoldBackgroundColor: scheme.surface,
+      elevatedButtonTheme: ElevatedButtonThemeData(
+        style: ElevatedButton.styleFrom(
+          backgroundColor: scheme.primary,
+          foregroundColor: scheme.onPrimary,
+          padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 14),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(16),
+          ),
+        ),
+      ),
     );
   }
 }