Initial commit to new repository

src/AxCopilot/Views/RegionSelectWindow.xaml

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+<Window x:Class="AxCopilot.Views.RegionSelectWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        WindowStyle="None"
+        AllowsTransparency="True"
+        Background="Transparent"
+        Topmost="True"
+        ShowInTaskbar="False"
+        ResizeMode="NoResize"
+        WindowStartupLocation="Manual"
+        Cursor="Cross"
+        MouseDown="Window_MouseDown"
+        MouseMove="Window_MouseMove"
+        MouseUp="Window_MouseUp"
+        KeyDown="Window_KeyDown">
+
+    <Canvas x:Name="RootCanvas">
+        <!-- 반투명 어두운 배경 (선택 영역 바깥) -->
+        <!-- 바깥 마스크: 4개의 반투명 사각형으로 구성 (성능 최적) -->
+        <Rectangle x:Name="OverlayTop"    Fill="#88000000" Canvas.Left="0" Canvas.Top="0"/>
+        <Rectangle x:Name="OverlayBottom" Fill="#88000000" Canvas.Left="0"/>
+        <Rectangle x:Name="OverlayLeft"   Fill="#88000000" Canvas.Left="0"/>
+        <Rectangle x:Name="OverlayRight"  Fill="#88000000"/>
+
+        <!-- 선택 영역 테두리 (실선) -->
+        <Rectangle x:Name="SelectionBorder"
+                   Stroke="#00D4FF"
+                   StrokeThickness="1.5"
+                   Fill="Transparent"
+                   Visibility="Collapsed"/>
+
+        <!-- 가이드 텍스트 (드래그 전) -->
+        <Border x:Name="GuideText"
+                Canvas.Left="0" Canvas.Top="0"
+                Background="#CC1A1B2E"
+                CornerRadius="10"
+                Padding="20,12">
+            <StackPanel>
+                <TextBlock Text="캡처할 영역을 드래그하세요"
+                           FontSize="16" FontWeight="SemiBold"
+                           Foreground="White"
+                           HorizontalAlignment="Center"/>
+                <TextBlock Text="ESC — 취소  ·  마우스 버튼을 놓으면 캡처"
+                           FontSize="12" Foreground="#88AACCFF"
+                           HorizontalAlignment="Center"
+                           Margin="0,6,0,0"/>
+            </StackPanel>
+        </Border>
+
+        <!-- 크기 표시 레이블 -->
+        <Border x:Name="SizeLabel"
+                Background="#CC1A1B2E"
+                CornerRadius="6"
+                Padding="8,4"
+                Visibility="Collapsed">
+            <TextBlock x:Name="SizeLabelText"
+                       FontSize="11"
+                       FontFamily="Consolas"
+                       Foreground="#00D4FF"/>
+        </Border>
+    </Canvas>
+</Window>