재구성 AX Agent 설정과 채팅 UI를 Claude형 구조로

src/AxCopilot/Themes/AgentSystem.xaml

@@ -0,0 +1,17 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <SolidColorBrush x:Key="LauncherBackground" Color="#111827"/>
+    <SolidColorBrush x:Key="ItemBackground" Color="#1F2937"/>
+    <SolidColorBrush x:Key="ItemSelectedBackground" Color="#243244"/>
+    <SolidColorBrush x:Key="ItemHoverBackground" Color="#2A3748"/>
+    <SolidColorBrush x:Key="PrimaryText" Color="#F1F5F9"/>
+    <SolidColorBrush x:Key="SecondaryText" Color="#9CA3AF"/>
+    <SolidColorBrush x:Key="PlaceholderText" Color="#6B7280"/>
+    <SolidColorBrush x:Key="AccentColor" Color="#22D3EE"/>
+    <SolidColorBrush x:Key="SeparatorColor" Color="#374151"/>
+    <SolidColorBrush x:Key="HintBackground" Color="#0F172A"/>
+    <SolidColorBrush x:Key="HintText" Color="#A5F3FC"/>
+    <SolidColorBrush x:Key="BorderColor" Color="#4B5563"/>
+    <SolidColorBrush x:Key="ScrollbarThumb" Color="#4B5563"/>
+    <SolidColorBrush x:Key="ShadowColor" Color="#8B000000"/>
+</ResourceDictionary>