fix: preserve known connection loss errors

apps/desktop/src/lib/connectionHealth.ts

@@ -7,11 +7,22 @@ const CONNECTION_ERROR_PATTERNS = [
   "connection not found",
   "connection config not found",
   "not connected",
+  "closed the connection",
   "broken pipe",
   "reset by peer",
   "socket closed",
   "unexpected eof",
+  "end-of-file",
   "end-of-file on communication channel",
+  "server closed session",
+  "communicating with the server",
+  "exceeded maximum idle time",
+  "agent stdin not available",
+  "agent stdout not available",
+  "failed to write to agent stdin",
+  "failed to flush agent stdin",
+  "关闭的连接",
+  "连接已关闭",
   "i/o error",
 ];