Add benchmark results and tests for LSP graph builder and staged search

- Introduced a new benchmark results file for performance comparison on 2026-02-09.
- Added a test for LspGraphBuilder to ensure it does not expand nodes at maximum depth.
- Created a test for the staged search pipeline to validate fallback behavior when stage 1 returns empty results.

ccw/frontend/src/locales/en/issues.json

@@ -119,7 +119,8 @@
       "none": "No sessions",
       "refresh": "Refresh",
       "new": "New Session",
-      "close": "Close"
+      "close": "Close",
+      "share": "Share (Read-only)"
     },
     "exec": {
       "tool": "Tool",

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

@@ -119,7 +119,8 @@
       "none": "暂无会话",
       "refresh": "刷新",
       "new": "新建会话",
-      "close": "关闭"
+      "close": "关闭",
+      "share": "分享（只读）"
     },
     "exec": {
       "tool": "工具",