feat: add CLI Viewer Page with multi-pane layout and state management

- Implemented the CliViewerPage component for displaying CLI outputs in a configurable multi-pane layout.
- Integrated Zustand for state management, allowing for dynamic layout changes and tab management.
- Added layout options: single, split horizontal, split vertical, and 2x2 grid.
- Created viewerStore for managing layout, panes, and tabs, including actions for adding/removing panes and tabs.
- Added CoordinatorPage barrel export for easier imports.

ccw/frontend/src/locales/zh/navigation.json

@@ -14,7 +14,9 @@
     "project": "项目",
     "history": "历史",
     "orchestrator": "编排器",
+    "coordinator": "协调器",
     "loops": "循环监控",
+    "cliViewer": "CLI 查看器",
     "issues": "问题",
     "issueQueue": "问题队列",
     "issueDiscovery": "问题发现",
@@ -75,6 +77,8 @@
     "noExecutionsHint": "启动 CLI 命令以查看流式输出",
     "noMessages": "等待消息...",
     "noMatch": "未找到匹配的消息",
+    "openInViewer": "在 CLI 查看器中打开",
+    "popOutToPage": "弹出到全页面",
     "statusBar": "{total} 个执行 | {active} 个活跃 | {errors} 个错误 | {lines} 行",
     "copy": "复制",
     "copied": "已复制！",