Build XCUI splitter foundation and test harness

tests/UI/Editor/integration/input/shortcut_scope/CMakeLists.txt

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+set(EDITOR_UI_INPUT_SHORTCUT_SCOPE_RESOURCES
+    View.xcui
+    ${CMAKE_SOURCE_DIR}/tests/UI/Editor/integration/shared/themes/editor_validation.xctheme
+)
+
+add_executable(editor_ui_input_shortcut_scope_validation WIN32
+    main.cpp
+    ${EDITOR_UI_INPUT_SHORTCUT_SCOPE_RESOURCES}
+)
+
+target_include_directories(editor_ui_input_shortcut_scope_validation PRIVATE
+    ${CMAKE_SOURCE_DIR}/tests/UI/Editor/integration/shared/src
+    ${CMAKE_SOURCE_DIR}/engine/include
+)
+
+target_compile_definitions(editor_ui_input_shortcut_scope_validation PRIVATE
+    UNICODE
+    _UNICODE
+)
+
+if(MSVC)
+    target_compile_options(editor_ui_input_shortcut_scope_validation PRIVATE /utf-8 /FS)
+    set_property(TARGET editor_ui_input_shortcut_scope_validation PROPERTY
+        MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
+endif()
+
+target_link_libraries(editor_ui_input_shortcut_scope_validation PRIVATE
+    editor_ui_integration_host
+)
+
+set_target_properties(editor_ui_input_shortcut_scope_validation PROPERTIES
+    OUTPUT_NAME "XCUIEditorInputShortcutScopeValidation"
+)
+
+source_group(TREE "${CMAKE_CURRENT_SOURCE_DIR}" FILES View.xcui)

tests/UI/Editor/integration/input/shortcut_scope/View.xcui

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+<View
+  name="EditorInputShortcutScope"
+  theme="../../shared/themes/editor_validation.xctheme"
+  shortcut="Ctrl+P"
+  shortcutCommand="global.command"
+  shortcutScope="global">
+  <Column padding="20" gap="12">
+    <Card
+      title="Editor Validation | Shortcut Scope"
+      subtitle="验证功能：Editor shortcut scope 路由与 text input suppression"
+      tone="accent"
+      height="100">
+      <Column gap="6">
+        <Text text="功能 1：验证 Ctrl+P 在 Widget / Panel / Window / Global 间按优先级命中 shortcut。" />
+        <Text text="功能 2：验证 Text Input Proxy 会抑制 Ctrl+P 和 Tab 焦点遍历。" />
+      </Column>
+    </Card>
+
+    <Button id="global-focus" text="Global Focus" />
+
+    <Card
+      id="window-shell"
+      title="Window Scope"
+      subtitle="Ctrl+P -> window.command"
+      shortcutScopeRoot="window"
+      shortcut="Ctrl+P"
+      shortcutCommand="window.command"
+      shortcutScope="window">
+      <Column gap="10">
+        <Text text="先检查优先级：widget > panel > window > global。" />
+        <Button id="window-focus" text="Window Focus" />
+
+        <Card
+          id="panel-shell"
+          title="Panel Scope"
+          subtitle="Ctrl+P -> panel.command"
+          shortcutScopeRoot="panel"
+          shortcut="Ctrl+P"
+          shortcutCommand="panel.command"
+          shortcutScope="panel">
+          <Column gap="10">
+            <Button id="panel-focus" text="Panel Focus" />
+
+            <Card
+              id="widget-shell"
+              title="Widget Scope"
+              subtitle="Ctrl+P -> widget.command"
+              tone="accent-alt"
+              shortcutScopeRoot="widget"
+              shortcut="Ctrl+P"
+              shortcutCommand="widget.command"
+              shortcutScope="widget">
+              <Column gap="10">
+                <Button id="widget-focus" text="Widget Focus" />
+              </Column>
+            </Card>
+
+            <Button id="text-input" text="Text Input Proxy" textInput="true" />
+            <Text text="操作指引：" />
+            <Text text="1. 依次点 Widget / Panel / Window / Global Focus，再按 Ctrl+P。" />
+            <Text text="2. 右下角 Recent shortcut 应分别显示 widget / panel / window / global，且状态为 handled。" />
+            <Text text="3. 点 Text Input Proxy 再按 Ctrl+P，Recent shortcut 状态应变为 suppressed。" />
+            <Text text="4. 保持 Text Input Proxy focus 再按 Tab，Result 应显示 focus traversal suppressed，focus 不应跳走。" />
+          </Column>
+        </Card>
+      </Column>
+    </Card>
+  </Column>
+</View>

tests/UI/Editor/integration/input/shortcut_scope/main.cpp

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+#include "Application.h"
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, LPWSTR, int nCmdShow) {
+    return XCEngine::Tests::EditorUI::RunEditorUIValidationApp(
+        hInstance,
+        nCmdShow,
+        "editor.input.shortcut_scope");
+}