fix rpc no-route errors, fix fileopen in preview (#313)

frontend/app/store/wshrpc.ts

@@ -103,6 +103,14 @@ function handleIncomingRpcMessage(msg: RpcMessage, eventHandlerFn: (event: WaveE
             }
             return;
         }
+        if (msg.command == "message") {
+            if (msg.data?.oref != null) {
+                console.log("rpc:message", msg.data?.oref, msg.data?.message);
+            } else {
+                console.log("rpc:message", msg.data?.message);
+            }
+            return;
+        }
 
         console.log("rpc command not supported", msg);
         return;

frontend/app/store/wshserver.ts

@@ -107,6 +107,11 @@ class WshServerType {
         return WOS.wshServerRpcHelper_call("remotefileinfo", data, opts);
     }
 
+    // command "remotefilejoin" [call]
+    RemoteFileJoinCommand(data: string[], opts?: RpcOpts): Promise<FileInfo> {
+        return WOS.wshServerRpcHelper_call("remotefilejoin", data, opts);
+    }
+
     // command "remotestreamcpudata" [responsestream]
 	RemoteStreamCpuDataCommand(opts?: RpcOpts): AsyncGenerator<TimeSeriesData, void, boolean> {
         return WOS.wshServerRpcHelper_responsestream("remotestreamcpudata", null, opts);