Add Chromium-only Blender WebEngine parity work

docs/status/W-019.md

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+# W-019 Status
+
+status: done
+task: 实现 Blender 风格默认工作区和交互
+
+## Evidence
+
+- Shell: `web/app/src/app/App.tsx`
+- Styles: `web/app/src/app/app-shell.css`
+- Default areas: 3D Viewport, Outliner, Properties and Timeline.
+- Interactions: Layout/Modeling/Animation tabs, Object/Edit mode context and
+  F3 Operator Search are wired through the UI command reducer.
+- Golden: `tests/golden/W-019/ui-layout-1440x900.png`
+
+The current milestone implements the default shell and context routing. Area
+split/join and full OperatorRegistry commands remain later work, as specified
+by W-069 and the subsequent modeling packages.
+
+## Verification
+
+```text
+npm run test:e2e  # 3 passed
+```