feat(xcui): add tab strip and workspace compose foundations

tests/UI/Editor/integration/layout/workspace_compose/CMakeLists.txt

@@ -0,0 +1,35 @@
+set(EDITOR_UI_LAYOUT_WORKSPACE_COMPOSE_RESOURCES
+    View.xcui
+    ${CMAKE_SOURCE_DIR}/tests/UI/Editor/integration/shared/themes/editor_validation.xctheme
+)
+
+add_executable(editor_ui_layout_workspace_compose_validation WIN32
+    main.cpp
+    ${EDITOR_UI_LAYOUT_WORKSPACE_COMPOSE_RESOURCES}
+)
+
+target_include_directories(editor_ui_layout_workspace_compose_validation PRIVATE
+    ${CMAKE_SOURCE_DIR}/tests/UI/Editor/integration/shared/src
+    ${CMAKE_SOURCE_DIR}/engine/include
+)
+
+target_compile_definitions(editor_ui_layout_workspace_compose_validation PRIVATE
+    UNICODE
+    _UNICODE
+)
+
+if(MSVC)
+    target_compile_options(editor_ui_layout_workspace_compose_validation PRIVATE /utf-8 /FS)
+    set_property(TARGET editor_ui_layout_workspace_compose_validation PROPERTY
+        MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
+endif()
+
+target_link_libraries(editor_ui_layout_workspace_compose_validation PRIVATE
+    editor_ui_integration_host
+)
+
+set_target_properties(editor_ui_layout_workspace_compose_validation PROPERTIES
+    OUTPUT_NAME "XCUIEditorLayoutWorkspaceComposeValidation"
+)
+
+source_group(TREE "${CMAKE_CURRENT_SOURCE_DIR}" FILES View.xcui)

tests/UI/Editor/integration/layout/workspace_compose/View.xcui

@@ -0,0 +1,94 @@
+<View
+  name="EditorWorkspaceComposeValidation"
+  theme="../../shared/themes/editor_validation.xctheme">
+  <Column width="fill" height="fill" padding="20" gap="12">
+    <Card
+      title="功能：Workspace compose"
+      subtitle="只检查 editor 工作区的 split + tab + placeholder 组合，不检查任何业务面板"
+      tone="accent"
+      height="156">
+      <Column gap="6">
+        <Text text="1. 先看布局：左、中、右、下四个区域应边界清晰，没有重叠、穿透或错位。" />
+        <Text text="2. 拖拽 workspace-left-right 和 workspace-top-bottom：各区域尺寸应实时变化，并被最小尺寸 clamp 住。" />
+        <Text text="3. 点击中间的 Document A / B / C：只应显示当前 selected tab 的 placeholder 内容。" />
+        <Text text="4. 这个场景只验证工作区组合基础，不代表 Hierarchy / Inspector / Console 已开始实现。" />
+      </Column>
+    </Card>
+
+    <Splitter
+      id="workspace-top-bottom"
+      axis="vertical"
+      splitRatio="0.76"
+      splitterSize="10"
+      splitterHitSize="18"
+      primaryMin="320"
+      secondaryMin="120"
+      height="fill">
+      <Splitter
+        id="workspace-left-right"
+        axis="horizontal"
+        splitRatio="0.24"
+        splitterSize="10"
+        splitterHitSize="18"
+        primaryMin="160"
+        secondaryMin="420"
+        height="fill">
+        <Card id="workspace-left-slot" title="Navigation Slot" subtitle="placeholder panel host" height="fill">
+          <Column gap="8">
+            <Text text="这里是左侧 placeholder slot，只检查 pane compose。" />
+          </Column>
+        </Card>
+
+        <Splitter
+          id="workspace-center-right"
+          axis="horizontal"
+          splitRatio="0.70"
+          splitterSize="10"
+          splitterHitSize="18"
+          primaryMin="260"
+          secondaryMin="180"
+          height="fill">
+          <TabStrip
+            id="workspace-document-tabs"
+            tabHeaderHeight="34"
+            tabMinWidth="112"
+            height="fill">
+            <Tab id="tab-document-a" label="Document A" selected="true">
+              <Card title="Primary Document Slot" subtitle="selected = Document A" height="fill">
+                <Column gap="8">
+                  <Text text="这里应只显示 Document A 的 placeholder 内容。" />
+                </Column>
+              </Card>
+            </Tab>
+            <Tab id="tab-document-b" label="Document B">
+              <Card title="Secondary Document Slot" subtitle="selected = Document B" height="fill">
+                <Column gap="8">
+                  <Text text="切换到 Document B 后，A 的内容应消失。" />
+                </Column>
+              </Card>
+            </Tab>
+            <Tab id="tab-document-c" label="Document C">
+              <Card title="Tertiary Document Slot" subtitle="selected = Document C" height="fill">
+                <Column gap="8">
+                  <Text text="这里只是第三个 placeholder，不代表真实面板业务。" />
+                </Column>
+              </Card>
+            </Tab>
+          </TabStrip>
+
+          <Card id="workspace-right-slot" title="Details Slot" subtitle="placeholder panel host" height="fill">
+            <Column gap="8">
+              <Text text="这里是右侧 placeholder slot，只检查嵌套 split 稳定性。" />
+            </Column>
+          </Card>
+        </Splitter>
+      </Splitter>
+
+      <Card id="workspace-bottom-slot" title="Output Slot" subtitle="placeholder panel host" height="fill">
+        <Column gap="8">
+          <Text text="这里是底部 placeholder slot，用来检查上下 split compose。" />
+        </Column>
+      </Card>
+    </Splitter>
+  </Column>
+</View>

tests/UI/Editor/integration/layout/workspace_compose/captures/.gitkeep

@@ -0,0 +1 @@
+

tests/UI/Editor/integration/layout/workspace_compose/main.cpp

@@ -0,0 +1,8 @@
+#include "Application.h"
+
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, LPWSTR, int nCmdShow) {
+    return XCEngine::Tests::EditorUI::RunEditorUIValidationApp(
+        hInstance,
+        nCmdShow,
+        "editor.layout.workspace_compose");
+}