feat(xcui): advance core and editor validation flow

tests/UI/Editor/integration/workspace_shell_compose/CMakeLists.txt

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

tests/UI/Editor/integration/workspace_shell_compose/View.xcui

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+<View
+  name="EditorWorkspaceShellComposeValidation"
+  theme="../shared/themes/editor_validation.xctheme">
+  <Column width="fill" height="fill" padding="20" gap="12">
+    <Card
+      title="测试内容：Editor Shell 基础壳层组合"
+      subtitle="只验证 Splitter / TabStrip / Panel Frame / 占位内容；不验证业务面板，不验证 new_editor 应用逻辑"
+      tone="accent"
+      height="156">
+      <Column gap="6">
+        <Text text="1. 检查左、中、右、下四个壳层区域边界是否干净，没有重叠、穿透或错位。" />
+        <Text text="2. 拖动 shell-left-right、shell-center-right、shell-top-bottom，确认实时 resize 正常，并且会被最小尺寸正确 clamp。" />
+        <Text text="3. 点击 Document A / B / C，确认中心区域只显示当前选中的 tab 占位内容。" />
+        <Text text="4. 这个测试不负责验证业务面板、数据绑定、命令系统，也不负责验证 new_editor 整体行为。" />
+      </Column>
+    </Card>
+
+    <Splitter
+      id="shell-top-bottom"
+      axis="vertical"
+      splitRatio="0.76"
+      splitterSize="10"
+      splitterHitSize="18"
+      primaryMin="340"
+      secondaryMin="120"
+      height="fill">
+      <Splitter
+        id="shell-left-right"
+        axis="horizontal"
+        splitRatio="0.22"
+        splitterSize="10"
+        splitterHitSize="18"
+        primaryMin="180"
+        secondaryMin="480"
+        height="fill">
+        <Card id="left-dock-placeholder" title="左侧 Dock 占位" subtitle="仅用于验证壳层 panel frame" height="fill">
+          <Column gap="8">
+            <Text text="这里用于检查 panel chrome 的边界、padding 和 split 稳定性。" />
+          </Column>
+        </Card>
+
+        <Splitter
+          id="shell-center-right"
+          axis="horizontal"
+          splitRatio="0.72"
+          splitterSize="10"
+          splitterHitSize="18"
+          primaryMin="280"
+          secondaryMin="200"
+          height="fill">
+          <TabStrip
+            id="document-tab-host"
+            tabHeaderHeight="34"
+            tabMinWidth="120"
+            height="fill">
+            <Tab id="document-tab-a" label="Document A" selected="true">
+              <Card title="文档占位 A" subtitle="当前选中 = Document A" height="fill">
+                <Column gap="8">
+                  <Text text="中心主区域此时应该只渲染当前选中的 tab 占位内容。" />
+                </Column>
+              </Card>
+            </Tab>
+            <Tab id="document-tab-b" label="Document B">
+              <Card title="文档占位 B" subtitle="当前选中 = Document B" height="fill">
+                <Column gap="8">
+                  <Text text="切到 Document B 后，Document A 的内容应该被隐藏。" />
+                </Column>
+              </Card>
+            </Tab>
+            <Tab id="document-tab-c" label="Document C">
+              <Card title="文档占位 C" subtitle="当前选中 = Document C" height="fill">
+                <Column gap="8">
+                  <Text text="这只是壳层 tab 占位，不是真实的 Editor 业务面板。" />
+                </Column>
+              </Card>
+            </Tab>
+          </TabStrip>
+
+          <Card id="right-dock-placeholder" title="右侧 Dock 占位" subtitle="仅用于验证壳层 panel frame" height="fill">
+            <Column gap="8">
+              <Text text="这里用于检查嵌套 split 和右侧占位 panel shell 是否稳定。" />
+            </Column>
+          </Card>
+        </Splitter>
+      </Splitter>
+
+      <Card id="bottom-dock-placeholder" title="底部 Dock 占位" subtitle="仅用于验证壳层 panel frame" height="fill">
+        <Column gap="8">
+          <Text text="这里用于检查底部 dock shell 和上下分割组合是否正常。" />
+        </Column>
+      </Card>
+    </Splitter>
+  </Column>
+</View>

tests/UI/Editor/integration/workspace_shell_compose/captures/.gitkeep

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+

tests/UI/Editor/integration/workspace_shell_compose/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.shell.workspace_compose");
+}