Build XCUI splitter foundation and test harness

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

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

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

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+# Pointer States Validation
+
+可执行 target：
+
+- `editor_ui_input_pointer_states_validation`
+
+运行：
+
+```bash
+build\tests\UI\Editor\integration\input\pointer_states\Debug\XCUIEditorInputPointerStatesValidation.exe
+```
+
+检查点：
+
+1. hover 左侧按钮，只应变化 `hover`
+2. 按住中间按钮，应看到 `focus`、`active`、`capture`
+3. 拖到右侧再松开，应看到 `capture` 清空，route 转到新的目标

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

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+<View
+  name="EditorInputPointerStates"
+  theme="../../shared/themes/editor_validation.xctheme">
+  <Column padding="24" gap="16">
+    <Card
+      title="Editor Validation | Pointer States"
+      subtitle="当前批次：鼠标 hover / focus / active / capture"
+      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="这一轮只检查鼠标输入状态，不混入别的控件实验。" />
+      </Column>
+    </Card>
+
+    <Card title="Pointer Input" subtitle="hover focus active capture" height="196">
+      <Column gap="12">
+        <Text text="这一轮只需要检查下面这三个按钮。" />
+        <Row gap="12">
+          <Button id="input-hover" text="Hover / Focus" />
+          <Button id="input-capture" text="Pointer Capture" capturePointer="true" />
+          <Button id="input-route" text="Route Target" />
+        </Row>
+        <Text text="1. 鼠标移到左侧按钮：hover 应变化，focus 保持空。" />
+        <Text text="2. 按住中间按钮：focus、active、capture 都应留在中间。" />
+        <Text text="3. 拖到右侧再松开：hover 移到右侧，capture 清空，focus 仍留中间。" />
+      </Column>
+    </Card>
+  </Column>
+</View>

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