fix(grpc): ensure that protobuf has Long support

renderer/workers/grpc.worker.js

@@ -1,6 +1,18 @@
 /* eslint-disable no-restricted-globals */
 
 import { expose } from 'comlinkjs'
+import * as Protobuf from 'protobufjs'
+import Long from 'long'
 import ZapGrpc from '@zap/services/grpc/grpc'
 
+// Protobuf assumes that long.js is either available on the global scope or available to be required. However, when
+// used from the context of one of our web workers neither of these assumptions is true. In order to ensure that Long
+// support is available in protobuf we manually configure protobuf here, before it is used.
+//
+// See https://github.com/protobufjs/protobuf.js#browserify-integration
+//
+// This ensures that large numbers (such as those returned from chan_id props) can be properly handled without rounding.
+Protobuf.util.Long = Long
+Protobuf.configure()
+
 expose(ZapGrpc, self)