Initial commit to new repository

src/AxCopilot/Views/TextActionPopup.xaml

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+<Window x:Class="AxCopilot.Views.TextActionPopup"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        WindowStyle="None"
+        AllowsTransparency="True"
+        Background="Transparent"
+        ShowInTaskbar="False"
+        Topmost="True"
+        ResizeMode="NoResize"
+        SizeToContent="WidthAndHeight"
+        Deactivated="Window_Deactivated"
+        KeyDown="Window_KeyDown">
+
+    <Border CornerRadius="12"
+            Background="{DynamicResource LauncherBackground}"
+            BorderBrush="{DynamicResource AccentColor}"
+            BorderThickness="1"
+            Padding="6"
+            MinWidth="260">
+        <Border.Effect>
+            <DropShadowEffect Color="Black" BlurRadius="20" ShadowDepth="4" Opacity="0.3"/>
+        </Border.Effect>
+        <StackPanel>
+            <!-- 선택된 텍스트 미리보기 -->
+            <Border Background="{DynamicResource HintBackground}" CornerRadius="8" Padding="10,6" Margin="0,0,0,4">
+                <TextBlock x:Name="PreviewText"
+                           FontSize="11" FontStyle="Italic"
+                           Foreground="{DynamicResource SecondaryText}"
+                           TextTrimming="CharacterEllipsis"
+                           MaxWidth="300"/>
+            </Border>
+
+            <!-- 메뉴 항목들 -->
+            <StackPanel x:Name="MenuItems"/>
+        </StackPanel>
+    </Border>
+</Window>