Build XCUI splitter foundation and test harness

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

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

tests/UI/Editor/integration/input/keyboard_focus/README.md

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+# Keyboard Focus Validation
+
+可执行 target：
+
+- `editor_ui_input_keyboard_focus_validation`
+
+运行：
+
+```bash
+build\tests\UI\Editor\integration\input\keyboard_focus\Debug\XCUIEditorInputKeyboardFocusValidation.exe
+```
+
+检查点：
+
+1. 按 `Tab`，焦点依次切换三个按钮
+2. 按 `Shift+Tab`，焦点反向切换
+3. 按 `Enter` 或 `Space`，当前 `focus` 按钮进入 `active`
+4. 松开按键后，`active` 清空

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

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+<View
+  name="EditorInputKeyboardFocus"
+  theme="../../shared/themes/editor_validation.xctheme">
+  <Column padding="24" gap="16">
+    <Card
+      title="Editor Validation | Keyboard Focus"
+      subtitle="当前批次：Tab 焦点遍历 | Enter / Space 激活"
+      tone="accent"
+      height="90">
+      <Column gap="8">
+        <Text text="这是 editor 侧验证场景，不承载 runtime 游戏 UI。" />
+        <Text text="这一轮只检查键盘焦点和激活，不混入复杂 editor 面板。" />
+      </Column>
+    </Card>
+
+    <Card title="Keyboard Focus" subtitle="tab focus active" height="214">
+      <Column gap="12">
+        <Text text="只检查下面三个可聚焦按钮和右下角状态叠层。" />
+        <Row gap="12">
+          <Button id="focus-first" text="First Focus" />
+          <Button id="focus-second" text="Second Focus" />
+          <Button id="focus-third" text="Third Focus" />
+        </Row>
+        <Text text="1. 按 Tab：focus 应依次切到 First / Second / Third。" />
+        <Text text="2. 按 Shift+Tab：focus 应反向切换。" />
+        <Text text="3. focus 停在任一按钮后，按 Enter 或 Space：active 应出现；松开后 active 清空。" />
+      </Column>
+    </Card>
+  </Column>
+</View>

tests/UI/Editor/integration/input/keyboard_focus/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.keyboard_focus");
+}