재구성 AX Agent 설정과 채팅 UI를 Claude형 구조로

src/AxCopilot/Themes/AgentCodexLight.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="#FCFCFD"/>
+    <SolidColorBrush x:Key="ItemBackground" Color="#FFFFFF"/>
+    <SolidColorBrush x:Key="ItemSelectedBackground" Color="#EEF2FF"/>
+    <SolidColorBrush x:Key="ItemHoverBackground" Color="#F5F7FB"/>
+    <SolidColorBrush x:Key="PrimaryText" Color="#111827"/>
+    <SolidColorBrush x:Key="SecondaryText" Color="#667085"/>
+    <SolidColorBrush x:Key="PlaceholderText" Color="#98A2B3"/>
+    <SolidColorBrush x:Key="AccentColor" Color="#2563EB"/>
+    <SolidColorBrush x:Key="SeparatorColor" Color="#E4E7EC"/>
+    <SolidColorBrush x:Key="HintBackground" Color="#F8FAFC"/>
+    <SolidColorBrush x:Key="HintText" Color="#1D4ED8"/>
+    <SolidColorBrush x:Key="BorderColor" Color="#E4E7EC"/>
+    <SolidColorBrush x:Key="ScrollbarThumb" Color="#B8C0CC"/>
+    <SolidColorBrush x:Key="ShadowColor" Color="#22000000"/>
+</ResourceDictionary>